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Yamaha 90TLRB 4 stroke 2002 Rough idle

ewfloyd

New member
"Runs great at full throttle b

"Runs great at full throttle but idles rough and often dies. Ran great in May but started this problem this past weekend. I don't know anything about the Yamaha motor’s fuel system, but it acts like an idle jet has a restriction, maybe varnish. If that is a possibility, is there any additive like B12 Chemtool by Berryman that might be successful in cleaning the passage?"
 
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