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Old 06-29-2009, 12:07 PM   #1
bubba1020
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Red face '89 G2 backfire

Whats happenin' guys! Been a while since i've been on here. '89 yammy G2 been running fine until yesterday. Now "cuts out" when on the gas, then backfires when you let off. Loss of power because of the "cutting out." Air/vaccum leak? Spark plug fouled? Let me know. Thanks!
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Old 06-29-2009, 07:04 PM   #2
TheNewGuy
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Default Re: '89 G2 backfire

When was the last tune-up, filters and plug?

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Old 06-29-2009, 07:33 PM   #3
bubba1020
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Default Re: '89 G2 backfire

Don't know. Not in the last year, since i have owned it. What do u think is causing the backfire? Plug or air leak? and the "cutting out" ? My symptoms happen in this order: Choke to get started, then gas pedal pushed, misses when going down the road, then loud backfire when you let off the gas. Hmmmmmm..... Thanks! Let me know.
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Old 06-30-2009, 07:10 PM   #4
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Default Re: '89 G2 backfire

My G9 had similar issues when I first got it - new plug & air filter helped with bogging down - backfire was caused by sticky accelerator cable - backfire came back last summer - I'm pretty sure I had an overheat problem from the dirt roads around here - the starter solenoid quit & I'm just getting it back running
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Old 06-30-2009, 09:14 PM   #5
bubba1020
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Default Re: '89 G2 backfire

I havent checked my plug yet, I think that may be the culprit. Thanks!
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Old 07-01-2009, 07:14 AM   #6
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Default Re: '89 G2 backfire

Thinking back, it was the carburetor cable that was sticking that was causing the backfire the carb would be wide open when you released the gas
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Old 07-01-2009, 08:16 AM   #7
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Default Re: '89 G2 backfire

Backfires are usually due to the throttle on the carb. not closing all the way when you let off the pedal. Check your cable adjustment at the carb. and make sure the return spring for the throttle is working properly: pulling the throttle all the way closed.

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Old 07-01-2009, 09:36 AM   #8
bubba1020
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Default Re: '89 G2 backfire

Thanks! I'll check that out! I do have the speed spring from CPP on mine also. Let ya know. Thanks and have a great day!
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