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YFZ backfiring with choke off
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Posted by: bborntofly

I left old gas in my tank for over 4 months, and now when I start it up it runs fine with the choke on, but the minute I take the choke off it starts backfiring and popping. I think its the jets that are clogged. Can somone tell me where the low and high speed jets are located. Mine is a 2004 model. Or is it something else.......please help......