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Engine surges at high speed. i pulled apart each carb, they were nice and clean. i 'm begining to think electrical problem

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  • William Slattum May 11, 2010

    Type and engine model, old or new fuel? How long sitting.

  • smoothie8492
    smoothie8492 May 11, 2010

    Need more info, is it an outboard, is it a 2-cycle?



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  • 57 Answers

Make sure fresh fuel if 2stroke-renew evert 3 months if not used-mixture goes off and starts to gel

Posted on Oct 15, 2009


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Generator starts fine,runs high then low...high then lobing

check for a broken compensating spring on the governor to carby linkage

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Why does my car have a surging when going down the road at any speed? Electrical?

it is possible that it will be the cause of the problem. Clean the terminal and the connected wires by placing them in a container of hot solution of carbonated soda ( baking powder). This will neutralize the sulphuric acid corrosion. Was with clean water when reaction has stopped. Cover terminals with vaseliene ( CRC terminal spray wax is best) make sure all connections are tight.
Also have the fault codes read to check for ather sensor problems.

Jan 16, 2015 | 1995 Buick LeSabre

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Feels like it's surging going down the road but idles fine and starts fine just had carbs. Rebuilt wondering if it's electrical

Surging is usually caused by a too lean mixture. It depends on what speed this occurs. If it's at a speed of about 30-40 mph, the slow speed mixture is lean and you either need to increase the size of the slow jet to the next richer size or enrichen the idle mixture just a bit. Of course the later procedure messes up your idle mixture and is a "patch" for a too lean slow jet. If it's doing this at high speed, you could have a too small main jet or either of the two jets are not completly open and are partially obstruced. Also the high speed surge could be caused by the float level set to low. I would be more specific but you didn't tell me what year or model bike it was nor the type of carb on the engine.

Good Luck

Jun 30, 2011 | Harley Davidson XLH 1000 Sportster...

1 Answer

My Honda 13.5hp engine has started surging. It seemed to occur after the air filter fell off during mowing for a few seconds. I have tried cleaning the carburator but it still surges. Anything else I can...

Hi sndlys,
When the engine surges (we call it hunting) like that it usually means, the carburetor or the governor need adjustment. You have cleaned the carb. but did you clean or replace the air filter, and did you try to adjust the carb? Since it was running good before I doubt it is the governor. Try to adjust the high speed mixture screw by 1/8 turn at a time and waiting a few seconds to let that adjustment work it's way in the carb. Start by turning the screw out (counterclockwise) a few times. If nothing happens or gets worse turn the screw in (clockwise) a few times, but do not go less than 1 turn out from a lightly seated position. (turned clockwise until lightly seated so no damage is done to the seat or the needle screw) to prevent running in too lean a mixture to prevent overheating and possible engine damage. You could try the low (idle) speed mixture screw adjust a bit, but make sure you remember the position you started from whenever you any adjustment at all. I think if the carburetor is clean and the air filter is clean, also that there is a good fuel flow to the carb. you should be OK. I hope this helps out a bit.Get back to me if you need help. All the best and good luck. Denis.

Mar 02, 2011 | Honda Garden

1 Answer

My Honda Lawnmower engine is reving up and down. Tried adjusting the pilot and high speed but still reving up and down. Cleaned up air cleaner etc. Was working bang on one day and the next day went to use...

I think your mower has a blade clutch. If so, does it surge when the blade is engaged or only when disengaged? Either way it usually means there is some sort of debris in the carburetor. If it is surging with the blade disengaged, that is usually an indication of excessive wear in the carb and I would recommend to replace the carb. Otherwise, it can be cleaned.
Good luck!

Sep 10, 2010 | Honda Garden

1 Answer

Coleman Powermate 3000 surging

Check your air filter to make sure it is clean, especially if the gen. has been run in dirty, dusty conditions. Make sure the gas tank vent is not clogged.

Also, pour some combustion cleaner into the carb. through the air intake to clean the carb. It sounds like it is starving for gas.

Hope this helps.

Sep 27, 2009 | Coleman Powermate Premium Plus 6250W...

1 Answer


i think your issue is while at a steady cruising speed one of the carbs is not allowing steady fuel flow. so when you nail it, you cant hear or feel it. or maybe you can just a bit right when you hit it. one thing you can do short of taking the carbs off and cleaning them is, take the air filter apart and start the bike rev it up high and with a large clean rag shove it into the back of carbs and cut off ALL AIR FLOW.. at the same time, twist throttle wide open. doing this will flood out and kill the engine. but at the same time, it will sometimes clean any debris or grime out of the jets. try it a couple times.. hope this helps.

May 31, 2009 | 1993 Suzuki GSX-R 750 WP

1 Answer

Engine is surging.


sound through experience you have a air leak possible from a gasket or oring if so equipped. take some wd 40 and spray around the carb gaskets and seams. if this stabalises the surging or smooths it out it is definatley seeping air around it. in any case you will most likely need to take the carb back apart and repair or replace the gasket. hopes this helped. happy mowing!

Mar 29, 2009 | Craftsman Garden

1 Answer

Engine surges after warm

If your engine has an adjustment screw on the bottom of the carb. try adjusting that at high idle first also if you have a low idle screw. If that don't clear the surging than you might have to take the carb. off and clean it. If cleaning the carb. out dose not do it you may need to put a new carb. kit in. Any questions feel free to ask.

Jan 12, 2009 | Ariens 34 In. Zoom Series Riding Mower

1 Answer

PoulonPro Leaf Blower will not run properly

the carb has a screen in it it needs to be cleaned out the fuel gets crystalized in the carb when it sits for a while. and if the carb has a high and low on the carb meaning 2 screws on the side of the carb .one is for air and the other is for fuel try this first start it up and give it full throttle and turn the high adjustment till it does something screw it in slowley and or out till it is at full rpm sometimes the adjustment screws do vibrate there way out of adjustment .if it dont work then take the carb apart to clean out the screen

Nov 13, 2008 | Garden

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