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Old 07-16-2009, 06:40 PM   #1
pensfan87
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Default g2 losing spark at high rpm

changed the ignition coil,& igniterbox, the pickup coil ohms are what they should be, and motor definately has a good ground,spark is great until high rpm,then cuts out .motor runs great at low rpm , also checked all the wiring and connections ,any ideas?
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Old 07-18-2009, 02:03 PM   #2
Quadmaster
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Default Re: g2 losing spark at high rpm

Could it be running out of fuel ???? Just a thought...
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Old 07-18-2009, 02:18 PM   #3
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Default Re: g2 losing spark at high rpm

Did you have this problem before you changed those parts????
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Old 07-18-2009, 04:23 PM   #4
smallblock450sl
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Default Re: g2 losing spark at high rpm

May sound strange, I'd check your primary clutch weights.
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Old 07-18-2009, 06:08 PM   #5
pensfan87
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Default Re: g2 losing spark at high rpm

using a dynamic spark tester the spark is nice and blue, until high rpm then the spark just quits, engine slows then recovers,
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Old 07-18-2009, 06:19 PM   #6
pensfan87
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Default Re: g2 losing spark at high rpm

yes the kids where driving the cart, and thought they had run out of fuel, so i checked the fuel it was fine then started checking everything out including tearing the carb apart, airbox, fuses, all the usually suspects, only to find the spark quiting at high rpm.thought it was the igniter for sure, but after 200 dollars that was not it,
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Old 07-19-2009, 04:21 PM   #7
rjlevally
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Default Re: g2 losing spark at high rpm

My dad is having the same problem. He found out that the Yamaha has a rev limiter in the ignition module that cuts the ignition off at high rpm's. Supposedly this is a safety feature that thinks that the throttle is hung wide open and cuts the ignition off. From what I understand, you have to let off the throttle, let the cart slow down, the ignition resets, and will start again. He is still looking for a work around. As a side note, he has modified numerous things on the stock engine for more performance, ie. rejetted the carb, removed the govenor, high flow air filter, to name a few. At the Bonanza this weekend, it cut in on him about 100ft. before the finish in the drag race time trial. Hope this helps.
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Old 07-23-2009, 10:27 PM   #8
pensfan87
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Default Re: g2 losing spark at high rpm

clutch weights solved the problem thanks for the advice
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Old 07-24-2009, 08:39 AM   #9
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Default Re: g2 losing spark at high rpm

welcome to the forums pensfan87
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