08-14-2023, 07:09 PM | #1 |
Join Date: Aug 2023
Posts: 4
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Miss/Sputter at Mid to High RPM
I'm trying to figure out where to go next on my son's Tao Tao 125 ATV. t has a Sputter or miss at the higher RPM range. It start easily and runs great at lower RPMs, but as soon as you go middle to full throttle is starts to skip and spitter. If you slow down, it goes back to running fine. I thought it was likely a gummed up high speed jet, and after seeing that I couldn't take the carburetor apart, I got a brand new one and replaced the whole thing along with a new air filter, fuel filter and spark plug. Nothing changed and it it doing the exact same thing. I'm thinking it is something in the ignition, but I'm not sure what to try or replace next. The parts are pretty cheap, so I'm not afraid to replace stuff, but any help in the right direction would be greatly appreciated. Thanks in advance for any help or advice you can offer.
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08-14-2023, 08:19 PM | #2 |
Join Date: Sep 2021
Location: De Soto, MO
Posts: 1,945
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What brand spark plug? If you are cheaping out and getting a Chinese plug, replace it with an NGK.
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08-14-2023, 10:13 PM | #4 |
Join Date: May 2018
Posts: 1,639
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Sounds like shit fuel to me .Take a sample and stick it in your freezer to see how much water you have .
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08-15-2023, 01:49 PM | #5 | |
Join Date: Aug 2023
Posts: 4
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Quote:
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08-30-2023, 12:44 PM | #6 |
Join Date: Aug 2023
Posts: 4
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So... After changing the ENTIRE electrical system, carburator, fuel filter, flushing the tank, air filter, and new fuel, the thing still doesn't run any better. Would there be something internally that lets it run fine at idle and lower RPMs, but spit and sputter at full throttle/higher RPM?
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08-30-2023, 03:50 PM | #7 |
Join Date: Aug 2009
Posts: 564
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Have you tried any fine-tuning with the new carburetor that you installed? Made any air or fuel screw adjustments? Moved the jet needle clip down a notch or two? Try a size or two bigger on the main jet?
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09-01-2023, 07:10 AM | #8 |
Join Date: Feb 2009
Location: Michigan
Posts: 1,040
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If you haven't done so already, set your valve lash. They notoriously come tight when delivered.
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2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D |
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