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3 Posts
I have a 92 Yamaha Phazer with a 483 fan cooled engine.
It runs like a bag of garbage (coughs and splutters over 4000). I take the air box off--it runs great. I put the air box back on, it goes back to garbage. I replaced the main jets, no improvements.
Steve
It runs like a bag of garbage (coughs and splutters over 4000). I take the air box off--it runs great. I put the air box back on, it goes back to garbage. I replaced the main jets, no improvements.

Steve