04-23-2008, 10:45 AM | #1 |
Join Date: Feb 2008
Posts: 11
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sputtering
I have been having a problem with my bike. When I push it above 7500 rpm's or so it will "cut out" or "lose power" and has little power above 7000 before it does that. I have added a new air filter and a 115 carb jet. I'm not sure if it had that problem before I modded it because I didn't push it. I have also drilled the exhaust, only the end and first plate. Could I take the exhaust all the way off just long enough to test if that could be the problem? Maybe a carb problem? Not getting enough gas? Not enough air? I don't know. I have 2k miles on it.
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04-23-2008, 10:46 PM | #2 |
Join Date: Mar 2007
Posts: 193
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Could possibly be a rev limiter.. But i thought the limiter were closer to 8500RPM on the 200cc bikes. (is it a 200??) you did not say.
Ken |
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04-24-2008, 08:49 AM | #3 |
Join Date: May 2007
Location: Altamont, Kansas
Posts: 15,103
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Do you have the stock spark plug yet? If so replace it with a NGK plug.
Also check the connections on the CDI and coil. I would start with the sparkplug as it probably is fouled. Allen
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04-24-2008, 12:53 PM | #4 |
Join Date: Dec 2007
Posts: 117
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...and while you're at it, go ahead and put a quality plug wire on, too.
HTH, tcs |
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05-13-2008, 08:33 AM | #5 |
Join Date: Apr 2008
Location: Florida
Posts: 52
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Check this
Had the same problem with my new Viva SX200s, I had a kink in the choke cable.
Kinked the cable when replacing the jet, check the simple/stupid stuff first. |
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05-13-2008, 09:07 AM | #6 |
Join Date: Apr 2007
Location: Toronto Ontario Canada
Posts: 2,585
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What is the color of the electrodes on the sparkplug? 8O N2r
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05-13-2008, 02:45 PM | #7 |
Join Date: Nov 2007
Location: N.E. Saskatchewan, Canada
Posts: 679
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my guess is it is overjetted try 1 size smaller main. :wink:
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'91 Yamaha Warrior- stage 2 '83 Honda ATC 70 '08 Yongjiang 125cc mx (Loncin) '08 Yongjiang 150cc atv (Jinlong) |
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03-20-2009, 02:07 PM | #8 |
Join Date: Feb 2009
Posts: 50
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My bike is setup the same....foam filter, and a muffler-ectomy. I installed a 115 main jet and now at high RPM it pops and sputters, and literally will not accelerate...it seems it slows down as a matter of fact.
maybe the air/fuel screw??? |
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