Kawasaki engine surges at full throttle

I have a Ex-mark with a Kawasaki FH580V 19 HP zero turn that was running rough for a long time. After spending weeks trying everything I could think of to ge...

Yea its real easy. Everything just unscrews and screws back in. The throttle needle will be the hardest thing. When you take something out use Carb cleaner to clean those holes good. 1998 bayou 220. K&N power kit. Back wheels spaced 2.5 inches. Front wheels spaced 2 inches. 22x11.5 mud witches on back.194 posts · Joined 2009. #1 · Jun 11, 2015. Hey guys my local dealer sells Ferris mowers and I purchased 2 new 3100z's with the relatively new Kawasaki 37 hp DFI. I was wondering what experience you all have with them. My first mower had to have a new motor put on it at 200 hrs due to scarred Pistons. Now both of them have been acting up ...Tractor surging and bogging down. I have a John Deere GX325 18hp v-twin Kawasaki engine. 1) When started up and idling it surges very badly that when you hit the PTO switch it shuts off due to not enough power. If I half choke it to take the surge out it will engage. 2) After mowing for about a half hour or so, it will rattle very badly and ...The engine fails to function when there is an excess of carbon dioxide mixed with the exhaust gas and not enough oxygen. At this point, the Electronic Control Module overcompensates by allowing excess air to enter the chamber through the intake manifold and the engine runs lean. Therefore, the engine surges. The solution: Change the EGR …There are many reasons why an ATV sputters. The most common reason has to do with a carburetor problem like a tuning issue, vacuum leak, or gas leak. Other sputtering issues can be caused by an ignition issue. For the combustion chamber to work on an ATV, it needs air, gas, and a spark. As long as you take a close look at the mechanics behind ...136 posts · Joined 2010. #2 · Apr 1, 2011. 1) The Seafoam needs to go into the gas BEFORE the bike sits. It will prevent the build up of gunk in the carbs. The way you did it the old gas sat in the carb bowls depositing the crap, then you put the seafoam in to clean it up. Prvention is better than an attempt at a cure.

28021 posts · Joined 2011. #3 · May 12, 2014. You have dirt in the low speed circuit of the carb. The mower is running good under load because it is drawing fuel from the high speed jet in the carb, but once you remove the load and try to run at idle, the small blockage in the idle circuit is not allowing enough fuel past, and it surges.24,705. Jun 27, 2018 / Engine runs at full throttle. #2. A racing engine is always the governor. So it has not been installed properly or is not connected properly. If it is installed properly with the engine stationary it will be pushing the throttle butterfly fully open. With the engine running if you push the governor lever to open the ...When driving at full throttle engine rpms cut dramatically, then after a few seconds surge back up to full throttle, it does this after running about 300 yards. ... A forum community dedicated to Kawasaki Motorcycle owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, off …It has: -Fresh oil (5w 30) -Fresh gas treated with stabiliser. Runs smooth at idle and at midrange but backfires (afterfires) and surges at full throttle. I tried adjusting the high speed jet screw and that somewhat helped but it still backfires every once in awhile and stills seems to surge (more like the speed oscillates a little).Firstly, check to see that the carburetor is securely attached to the engine. Secondly, with a running engine, spray engine starter onto the gaskets and listen for a change in the surging. The engine starter spray will immediately have an effect, replacing the air being sucked in with a combustible substance.The engine started surging yesterday at both low throttle and high throttle. I changed out the fuel filter, no difference. ... '04 Ferris 52" Kawasaki 23 hp w/ Trac Vac '98 Exmark Metro 36" Kawasaki 14 hp ... a common problem that causes engine surging is dirt ingested into air jets. these are usually found in the carb throat behind choke plate ...txgrassguy. Remember that air cooled engines actually heat up a bit at idle and this may be a cause for the back firing. Unburnt fuel is ignited from the heat in the cylinder which can cause the back firing. The idea behind shutting a motor off at full throttle is the unburnt fuel is dumped into the cylinder actually cooling it down somewhat.

Check wire and plug end. They actually thread in the wire. v. check stator assembly. you'll have to remove flywheel to make sure there's no small broken wires in the winding or possibly damaged/missing woodruff key (keyway). v. coil - use a multimeter to check coil resistance. v.5. Nov 24, 2014 / John Deere D110 Surges at all throttle positions. #1. I have a JD D110 and the motor surges up and down through all throttle positions. I can see the governor rod moving back and forth. The mower only has 80 hours on it. I have done all the required mtc on the mower so far.Check the spark plugs and ignition coils - Worn or malfunctioning ignition coils can also be the culprit behind engine surging. Inspect these components and replace them if necessary. Inspect the fuel filter - A clogged fuel filter can restrict the flow of gasoline to the engine, resulting in engine surging. Replace if needed.1. Minimal Fuel System Response. Contaminated or bad fuel presents the main cause of surging on any engine. Dilution due to eventual condensation lowers the …When driving at full throttle engine rpms cut dramatically, then after a few seconds surge back up to full throttle, it does this after running about 300 yards. ... A forum community dedicated to Kawasaki Motorcycle owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, maintenance, off …Surging Engine. OK, we have a liquid cooled 27 HP Kawasaki engine model number FD750D-S04. It has a very bad surging problem from half throttle and above as long as it is not under a load. Once the blades are engaged or if you drive up a hill it smooths out and runs great. Another thing is it backfires and sputters when we take it from full ...

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64. Messages. 24,705. Jul 7, 2021 / Briggs intek backfires at full throttle and surge at low. #6. The backfiring is unburned fuel igniting in the muffler. Remove the blower housing and remove the kill wires form the coils. Problem goes away = failed diodes. If the problem stays then swap the coils left right.When I throttle back from WOT, the problem disappears. Seems like I can run all the way up to 5000RPM's without any issue. Then, on the way back in, I tried to run WOT again, and the surging became dramatic - the engine would suddenly drop from 5500RPM's all the way down to 1500RPM's, then jump back to WOT, and repeat in that …2017 Kawasaki Ultra 310x, 75 hours. Full throttle engine acts as if governed and bogs down. 2/3 throttle gets best response but only reaches 6000 RPM, normal for this ski is 7000. Posted by Tom Noble on Oct 02, 2018. Tom Noble Oct 02, 2018. I have two identical skis the other ski does not govern down or slow down and runs from day one at 7400 ...2. Engine Misfires or Backfires. A common challenge many have with the Kawasaki Bayou 300 is engine misfiring. There are four possible causes for this malady: An improperly timed fuel pump. A poorly tuned carburetor. Inaccurate valve timing. Unusually low idle screw setting.Jun 7, 2017 · However, if there are any leaks, the engine can draw in outside air that hasn’t had fuel added to it, leaning out the mixture. Start by tightening all the bolts around the carburetor: these can work loose after being subjected to engine vibration, letting the carburetor separate from the head. If the engine is still surging, inspect the ...

I have spent 18 months working on a surging Kawasaki FH601V purchased new in 2004. Always stored inside and well-maintained. Ran perfect from 2004 through spring of 2022. Recreational gas was used at least from 2014 - 2022. In early 2022, at about 400 hours, surging began. I have read the fora 2-3 times, tried everything I know, and still no ...Aug 21, 2017 / FR691V 24 HP surges and dies under load and or when hot. #2. Something most folks never consider is the fuel hose has braided nylon string in the middle of the hose. The hose can feel strong, not soft spots anywhere on it's entire length. However, a fuel hose can have a small spot anywhere on the inside that turned loose …2 posts · Joined 2023. #1 · Jan 14, 2023. 40hrs - 2017 Kawasaki Ultra LX 1500 non supercharged. Engine runs fine at light throttles and full throttle. At a certain part throttle range, it has instant power loss then back again, which can be several times a second until I gas on or reduce throttle. At times, more so after the first occurrence ...This is a late 90's model Scott's lawn tractor with a Kohler engine. After sitting a few years, it would start and run, but needed a little TLC to resolve th...New member. Apr 28, 2016. #1. have a 1990 evinrude tracker 30hp that runs fine at idle. take it to the lake and it runs fine in no wake zones. whenever the motor is cold the boat will run fine at full throttle. whenever it runs for 10 minutes and the motor gets hot it will start surging like a cylinder is missing. thought i was getting fuel in ...4. Dec 18, 2021 / Kohler ECV749 (EFI 29HP) Surging at mid to high throttle when idling. #5. ILENGINE said: Doing a TPS relearn may not be a bad idea to see if that improves the idle. It is very possible that the TPS is getting worn sending erratic signals to the ECU. May require a TPS replacement in the future.9. Messages. 63. Aug 2, 2019 / Gravely losing power under load. #4. Oh and see if your carb has an adjustment knob. Some do some dont. Also make sure there isnt debris in gas tank limiting the amount of fuel being pulled through. Make sure there is no vacuum leak on engine side of carb.Feb 19, 2018 · Feb 18, 2018 / 22hp V-twin STILL surging. Help! #2. that type of surge is normally associated with the idle circuit in the carb. Even though the engine runs at full throttle, you are still running on the idle circuit unless the engine is under load. those passages are normally in the area at or in front of the throttle butterfly if you are ... For example, with the engine not running, push the throttle to the choke position then make sure the choke is closed. Move the throttle from the choke position then make sure the choke is completely open. Make sure no cables have loosened and slipped. The choke not opening fully will cause the engine to run rich. 4.136 posts · Joined 2010. #2 · Apr 1, 2011. 1) The Seafoam needs to go into the gas BEFORE the bike sits. It will prevent the build up of gunk in the carbs. The way you did it the old gas sat in the carb bowls depositing the crap, then you put the seafoam in to clean it up. Prvention is better than an attempt at a cure.Mine was either 4.76 V or 4.99 V (spec: 4.75~5.25 V). With input at 4.99 V, I set maximum throttle output to 4.22 V (spec: 4.2~4.4 V) by turning main throttle sensor counterclockwise, to have idle position setting at 1.031 V, and within standard 1.005~1.035 V (after engine is warmed up, with idle set at 1300 rpm).Aug 21, 2017 / FR691V 24 HP surges and dies under load and or when hot. #2. Something most folks never consider is the fuel hose has braided nylon string in the middle of the hose. The hose can feel strong, not soft spots anywhere on it's entire length. However, a fuel hose can have a small spot anywhere on the inside that turned loose …

Locate the limiting mechanism by lifting up the cargo bay at the back, finding the black metal cover which is riveted over the governor (has the throttle rod going underneath it from the carburettor), drilling out the three rivets and removing the metal cover. Find the parts that resemble this:

I am having the same trouble with surging did the fule pump fix it. Comment by thomas — 11/06/2013 @ 8:07 pm. They changed the throtle plate 2 times Its been 6 months and its doing it again. The problem turned out to be ethanol gas causing buildup the computer gets confused and surges the engine.4. Throttle Body Problems. The Kawasaki Mule 4010 throttle body recall was due to a potentially faulty throttle body. The problem is that the throttle body may separate from the engine, causing it to stall. Also, oil vapors may get into the throttle body, and over time cause it to get jammed and not move.About 2-3 lawn cuts ago I started to notice under heavier load (going uphill mowing) the engine would sputter gradually and lose power. It would go away going downhill, but then repeat going uphill. The last lawn cut going up the same hill mowing at full throttle the sputtering was constant with a loss of power.Reason 1: High Float Level. Your Predator 212 will sputter at full throttle if your float level is high. The fuel level in the carburetor bowl is controlled by the float level. Sputtering can occur when the carburetor is flooded at full throttle by a high float level. Furthermore, if the float has a hole, it sinks and doesn't regulate the ...Full throttle, rpm surges up and down regardless of load. A small amount of gas was left in carburetor bowl last season (I did it!). I removed carburetor and cleaned bowl which had small amount of varnish. Removed carb. Float is good. Needle polished clean. Used carb cleaner, guitar string, and compressed air to clean openings in carb.This mower runs a half throttle, but surges when trying to run full throttle. Web the motor is a 19hp kawasaki fh601v it idles fantastic, and starts like a dream, but at full throttle and especially under load it lopes and seems to struggle to. Minimal fuel system response contaminated or bad fuel presents the main cause of surging on any engine.Aug 21, 2017 / FR691V 24 HP surges and dies under load and or when hot. #2. Something most folks never consider is the fuel hose has braided nylon string in the middle of the hose. The hose can feel strong, not soft spots anywhere on it's entire length. However, a fuel hose can have a small spot anywhere on the inside that turned loose …Briggs 22 hp twin surging badly all rps adjust governor arm , tried adjusting both ways now nothing but full throttle. Removed springs from arm, worked throttle by hand. No movement in governor arm at …

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13. Nov 16, 2021 / Kawasaki FX850V popping thru the exhaust. #1. Kawasaki FX850V-BS13 - put a new oem carburetor from kawasaki in after the old one got cracked by a falling tree limb. (Not my mower). Mower had been setting for awhile. After new carb install engine runs rough and backfires thru the exhaust. Found coil on left bank was week so I ...Jul 23, 2017 · Recently, it started surging and stalling after running for about 30 minutes, whether under load (blades) or not. The automatic choke seems to be the cause as I can see it opening and closing when this happens. I read a few posts on various forums about this issue and have done the following: New spark plugs. new air filter. new fuel filter. 345 Surging at mid and low throttle. Last weekend my 345 starting missing under load and died. Was slow to start and once it did I drove it 100 feet to the truck. It acted like a fuel issue (starving) and I had another filter in the truck so I dropped it in. Seemed better at full throttle but was surging at low to mid throttle and I could not ...May 13, 2022 ... Brute Lawnmower Surges But ... How To Quickly Fix eXmark engine surge (Engine Reving Up and Down) ... Stihl BR600 Leaf Blower Not Getting Full Power ...It sounds like your are running lean at cruise power. Does it surge when you are on steady throttle, meaning staying at a speed like 70mph. If ...I have a 1 year old Cub Cadet 2x24 I bought used after only 1 season of use. I drained the old fuel and filled it with high octane, ethanol free fuel. When I ran it, it would surge/hunt with the choke off. I took off …Storm surges are often the deadliest part of a hurricane, concealing large objects in the flood and propelling them along like battering rams. Hurricane Michael, recently upgraded ...3 posts · Joined 2006. #1 · May 29, 2007. I have a 34Z Gravely with a 15 hp Kawasaki and this is whats happening. When we start it up when it is cold it runs fine. After it warms up it starts to miss on one cylinder. I changed the coil but it didn't seem to help. Has anyone ever encountered this. Your help would be greatly appreciated.Got it started and it runs great but still surges. I did some troubleshooting and it seems to be a problem with the governor. At higher speeds, I can see the governor throttle linkage going back and forth as the engine surges. If I hold the linkage steady with a finger, there is no surging and the engine is smooth.Kawasaki Mule 4010 won't run full throttle Please help. I have an 09 Mule 4010 gas engine. I bought it from an older lady who didn't use it for a year or more. It will crank and run at slow speeds about half throttle but will backfire and not run if I press the pedal all of the way down. I drained the fuel tank and filled with 92 ethanol free.The engine sounds and feels bogged down and surges. When I get to the top of the hill I let off the accelerator and I feel like the the tranny reset to normal operation. I park it. The muffler is real hot. Oil is good, water is good. I let it sit for 30 minutes... only the check engine light is on now. ….

Kawasaki V2 engine problems. I have a Husqvarna AWD ride on with a Kawasaki FH531V 18.0 engine, done 520 hours. Motor started running rough about 2 months ago, was fine at full throttle under load but rough at idle and half throttle. I changed spark plugs, cleaned air filter, cleaned fuel filter but problem continued.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...4. Apr 30, 2018 / Kohler 7000 Started Surging Suggestions Needed Please. #1. Hi Follks, I am not the best at fixing small engines so I am trying to learn. I have a Troy-Bilt Zero turn with a Kohler 7000 Engine and Walbro Carb. The engine started to sputter and die when I ran it for 5 min. The first thing I tried is pulling off the carburetor ...Carefully reinstall the black limiter cap onto the adjustment screw. Turn the adjustment screw back and forth until it reads 1450 rpm + or - 75 rpm. Turn the idle stop screw clockwise until the tachometer reads 1550 rpm + or - 100 rpm. The 17-horsepower Kawasaki is a single cylinder, air-cooled engine. The carburetor delivers the fuel from the ...However, the case with the riding lawnmowers can be quite different if the lawn mower engine surges when it is at full throttle. If you have cleaned the carburetor jets, changed the air filter and the spark plug and you have drained the old gasoline but the engine still surges at full throttle, the problem can come from its governor system.Hi all and restrorob!! Restro, I have read alot of your posts on this problem and wanted your opinion. The engine runs fine mowing at full throttle. This is a John Deere Quicktrak 647 with 19 hp vert. Then it will surge under no load. I went to the my shop took check it out further. Changed air filter ,fuel filter,and plugs. Same thing.The engine bogs down at 3/4 - full throttle. I tried scraping the secondary screen inside the pump/pressure relief housing and got nothing. So I poked 3holes and put an inline filter on the line running from the tank to the engine. Worked like a champ, has great acceleration and power now. The other option is to replace the whole assembly I ...This is a late 90's model Scott's lawn tractor with a Kohler engine. After sitting a few years, it would start and run, but needed a little TLC to resolve th...The third solution is to clean the fuel filter. You can use a fuel system cleaner to clean the fuel filter and remove any debris that is restricting the flow of fuel. 8. Bogs Under Load. Kawasaki FR730V engine bogging under load is a common problem with this model of engine. Kawasaki engine surges at full throttle, I have a Ex-mark with a Kawasaki FH580V 19 HP zero turn that was running rough for a long time. After spending weeks trying everything I could think of to ge..., Check All Fuel Lines and Filters. Since a jet ski bogging down is primarily caused by too much fuel getting through the carburetor and into the engine, the best place to start is by examining every piece of machinery that is involved in the fuel relay process. That includes the fuel system in general, the fuel lines, the air filter, the fuel ..., Step 1: Check the Fuel. Check to see if you have adequate fuel. Also, make sure you are using the right kind of fuel for your lawnmower. This step is pretty basic but often gets overlooked. If you put the wrong fuel in the tank, drain it if the tank is full. If there is a quarter of the wrong fuel in the tank, top it off with the right fuel., The sputtering was due to the carbs being extremly dirty. The fixed the jetting and dynoed it. With the mods that I have its 39.6 hp (all internally stock motor). I rode it and could immediately tell there was a difference. Im not sure what jet sizes they used., Location: New York. Posts: 8. 2016 cub - EFI engine surging. Hi like I said the 547cc efi engine is surging when started at full throttle at low throttle it's fine when pto is engaged it's fine no idea why a brand new mower would do this. I called dealer I purchased from they said it's part of break in process and put a few hours on it and if ..., I have a 2009 Stingray with a Volvo 3.0 Penta FI engine. When I gave the boat full throttle it waits to go and then surges (like pumping the gas peddle in a car). The dealership has been "solving" the … read more, The common causes of 2 stroke bogging at full throttle include using the wrong gas mix, dirty or clogged air filters, damaged spark plugs or barrel gaskets, and damaged intake manifold gaskets. Easy …, Set the throttle control to a low rpm position. Secure the throttle to the idle position with a piece of wire and start the engine. With one finger, push the governor arm the the direction that will close the throttle. while doing this slowly open the throttle (manually - release the securing wire). As the rpm increases, slowly reduce the ..., Kawasaki engine (fh601v) troubleshooting. ... If I can ease the throttle up and get it to full throttle it will do fine. The only time it does this is at startup and when I engage the pto. Any thoughts would be greatly appreciated. ... This and the issue of surging seem to be the main carburetor issues. To find out if it was the carburetor I, The engine will often run fine at idle, but will die when it is throttled up. This is because there is less air moving through the engine at idle. When the engine is run at full throttle, especially under load, the air flow is much greater, which causes more back pressure, and results in the engine stalling., It surges about every 5 seconds at idle, about every 2-3 seconds while moving without blades engaged, and with a load/ blades engaged it either doesn't surge …, Stalls going to full throttle and surges at low throttle. Engine is an 18HP twin Briggs, it was running fine other than a few intermittent electrical issues. Here's what I did. It was about 50 degrees in the garage (15 outside) when I started it last night. It started right up at about 1/3 throttle and full choke., Chrome/Safari/Opera: There are a number of solutions for dealing with an inbox overwhelmed with spam, newsletters, marketing emails and so on. You can filter your mail, for example..., Tweet. #7. 06-20-2010, 12:08 PM. Re: stx 15f idle problems and running rough. I have a simliar problem with my 04 15 F with 77 hours on it. It ran great when I first rode it. Idled nice. Then after a 30 minute ride it would idle up around 2000- 3000 rpm on the trailer and vary up and down all the time., I have a 2007 Vulcan 500LTD which sat for about 12 months. I replaced the battery, cleaned and re-oiled the air filter, changed the spark plug, added sea foam with new gas to tank,(but did not completely drain the tank). The bike idles great, from full choke to half then to closed, but when I engage the throttle the bike dies., A 110cc engine can reach various speeds depending on which automobile it’s inside. The Kawasaki KLX 110cc dirt bike has a top speed of just over 50 miles per hour. This motorcycle ..., Same thing on my 02 auto. Started about 6 months ago, at about 165,000 mi. You can hear and feel the surge. Under steady throttle, it happens when the engine requests just a little more power. It is like it overcompensates. Most noticable at 45-55mph. I am quite sure the trans is NOT unlocking or slipping., The common causes of 2 stroke bogging at full throttle include using the wrong gas mix, dirty or clogged air filters, damaged spark plugs or barrel gaskets, and damaged intake manifold gaskets. Easy …, Jan 27, 2010 · Have an 06 3010 Trans. When driving at full throttle engine rpms cut dramatically, then after a few seconds surge back up to full throttle, it does this after running about 300 yards. I put it in the garage and go full throttle and it does not seems to pull the rpms all the way up. , The problem is the carb. is running a little lean and doing the above task should smooth it back out. 1 bad spark plug could cause this too. I've seen 1 plug do it on briggs a few times before, otherwise yes, RPM hunting is normally a lean fuel mix, pull the choke on a little and see if it smooths out, if it does, check your fuel filter first ..., How To Fix A Surging Engine on a Lawn Mower, Generator, Pressure Washer & More!Is your small engine equipment revving up and down, hunting, pulsing and surgi..., kbeechler. 11 posts · Joined 2022. #9 · Nov 8, 2022. I’m reading about the Kawasaki FJ180V surge, I have a brand new machine, straight out the box, it too surges during load, it idles beautifully.. it will really surge at full throttle, but if I back it off to about 3/4, it surges very little.., May 14, 2012 · Use a 15/64 drill bit and put it thru both holes to hold the throttle in place. Loosen the 2 cap (10mm) at the top of the throttle plate. The holes are slotted to allow you to move the entire plate toward the carburator (slower engine speed) or away from it (increasing speed). , 3. Aug 3, 2021 / Surging at full throttle. #5. bertsmobile1 said: We have all seen it before and the usual cause ( about 90%) is a blocked carburettor. After that is debris in the fuel tank cutting off the fuel supply. next is air leak between carb & engine. Then comes faulty solenoid. Then comes blocked fuel filter., The throttle body is an important part of the vehicle that allows air to flow into the engine. As with all combustion, air is required for an engine to fire properly. Generally, th..., 2003 ZX6R (UK, European model), Akrapovic slip on, PCIII, stock airfilter, KLEEN air suction valves removed and blanked. Throttles balanced. No obvious air leaks. No FI errors. The bike idles fine. It runs fine with clean fuelling throughout the rev range. But there's one exception. With the..., A clogged or dirty air filter can restrict airflow, leading to an unbalanced mix that bogs down the engine. Regularly inspect and clean your air filter or replace it with an air kit to ensure optimal air intake and engine performance. Contaminated Carburetor: Another common issue that can lead to bogging during acceleration is a dirty carburetor., Chrome/Safari/Opera: There are a number of solutions for dealing with an inbox overwhelmed with spam, newsletters, marketing emails and so on. You can filter your mail, for example..., Drain old gas from the tank. Use a siphon if you have one - and save spills on the engine and floor. Add a fuel stabilizer to the gas tank (manufacturer's recommended mix ratio) and top it with a full gas tank. Run the engine for 2 minutes to circulate the fresh gas. Check for mower engine surging., However, the case with the riding lawnmowers can be quite different if the lawn mower engine surges when it is at full throttle. If you have cleaned the carburetor jets, changed the air filter and the spark plug and you have drained the old gasoline but the engine still surges at full throttle, the problem can come from its governor system., Re: motor bogs down at full throttle I have a 1984 Yamaha 50hp, 3 cyl, oil injected, outboard motor, low hours, and is in fairly new condition. At full throttle, it bogs down. I've changed the gas lines, tank, and fittings. The water pump works fine and the water is luke warm. The repair manual doesn't help either., 14,778. Apr 23, 2021 / Mower runs at low RPM at full throttle. #7. Could be that the throttle cable is not adjusted properly. Try this, move throttle control to full speed, and then loosen the screw holding the cable in place. With the cable loose push it forward as far as possible and then tighten the screw., Changing the filter to an after market filter will lean the motor out which will cause a "surge" at full throttle. You will need to possible jet the motor richer to compensate for the leaner filter design. Third: Try rolling out og the throttle from full throttle by about 1/8th and see if the engine RPM's increase and the surge goes away, if so ...