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Discussion Starter · #1 ·
I just bought myself a yfz 450. It comes with Yoshimura pipe. K&k air filter with lid off. Stock compression. Intake cam and hot cam. Stock carb. It runs really good on 110 octane but I am going to school and can't afford to cough up 80 for 5 gal. I want to convert back to pump 91 octane what do I have to change on the jetting?
Do I just have to go up a number on the main jet.
I really need help and would appreciate it and sorry if I broke any of the posting rules.
 

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You should be good if it's stock compression...if it was oxygenated 110 then you need a reject. Shouldn't run race gas when it's not needed anyway. Heard it will hurt performanperformance
 
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