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Old 11-23-2010, 07:47 PM   #1
mannyvillegas
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Default Engine stutters/runs erratic

When I press on the accelerator real easy, the engine runs perfect. But if I press the gas pedal all the way down, the engine runs erratically. Is this a case of "too rich" air/fuel mixture, an electrical problem, carb (float) issue, air leak in carb or air leak in air filter box? It really got me baffled.
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Old 11-23-2010, 07:48 PM   #2
mannyvillegas
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Default Re: Engine stutters/runs erratic

Oh, it's a G2.
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Old 11-23-2010, 08:39 PM   #3
sho305
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Default Re: Engine stutters/runs erratic

Often a leak in the airbox will do that, not always. Any change to factory exhaust or intake will cause a jetting issue on most yamaha and you have to rejet. Could be dirt in carb too maybe ignition issue or fouled plug.
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Old 11-24-2010, 08:09 PM   #4
mannyvillegas
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Default Re: Engine stutters/runs erratic

I played around with the air/fuel mixture. It didn't work. I'll try a new plug on the week-end.
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Old 11-28-2010, 05:43 AM   #5
mannyvillegas
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Default Re: Engine stutters/runs erratic

New plug did not cure problem. Any ideas?
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Old 11-28-2010, 05:54 AM   #6
groundpounder
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Default Re: Engine stutters/runs erratic

have you tried it with air box off see how it runs? also try a Little chock then tell us what it does? if it runs better one of those ways let me know
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Old 11-29-2010, 12:33 AM   #7
mannyvillegas
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Default Re: Engine stutters/runs erratic

Removed air filter connection. Put on little choke. Even sprayed a little carb cleaner while engine is running. Same results. Runs erratically. Have adjusted valve clearance to .004. Have done everything that I could think of, have read here and elsewhere.

A mechanic friend advised me to check cylinder head tightness. Will do that today.

If still it wont work, I may have replace the carb as a last resort.
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Old 11-29-2010, 05:55 AM   #8
GMB74
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Default Re: Engine stutters/runs erratic

Do you have a spark tester like this:

http://www.harborfreight.com/90-inli...cker-4445.html

to test the ignition system? If you can get it to act up when the rear wheels are blocked up off the ground, this is a safe and easy way to eliminate an ignition problem. A lot cheaper than buying a carb if it is not a fuel problem.

Have you taken the carb apart and tried cleaning it ? Was there a lot of corrosion or carb snot inside? Ethanol fuel has been doing a number on carbs these days.
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Old 01-16-2015, 07:56 PM   #9
fishman296
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Default Re: Engine stutters/runs erratic

My '95 carryall Club car is also running erratic. Guy I bought it from had just replaced the carb (I even have the old one). The problem started when I switched to non-ethanol gas. This shouldn't have any effect on the problem would it?

Thanks for any help.
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Old 01-17-2015, 12:33 PM   #10
sho305
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Default Re: Engine stutters/runs erratic

If it stays constant with fuel changes then I'd look at ignition weakness (happens at more throttle when there is more mixture to ignite) or a mechanical issue such as valve timing/leaking/lash (more obvious with less vacuum at more throttle) or maybe head gasket/compression.
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