jeting after boreing out?? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-01-2003, 01:41 PM Thread Starter
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jeting after boreing out??

i have an 89 yz250wr. i just bored out the top end 1mil over (there was a scar that needed to be took out) is my typical jeting gona be ok? i heard that i may need to lean it up?? but that doesnt sound right i would think that it would need to be richend now?

thank you for any help
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post #2 of (permalink) Old 02-01-2003, 01:46 PM
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Re: jeting after boreing out??

It's usually fine..... That is if you didnt fine tune it as the old rings started to ware out.
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post #3 of (permalink) Old 02-01-2003, 02:25 PM
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Re: jeting after boreing out??

Go one size larger (richer) to be safe, then drop back down unless its not running too rich. Whenever you have a displacement increase you should richen your jetting in most cases.
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