Yamaha Moto4 1989 250 - Yamaha ATV Forum
 
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post #1 of 1 Old 01-09-2012, 10:48 AM Thread Starter
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Yamaha Moto4 1989 250

I have a 1989 Moto 4 that has started backfiring through the carb when it is cold. Not all the time just occasionally. Is this a timing problem or is it just because it's cold.
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