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Discussion Starter · #1 ·
what would be a good AFR (air fuel ratio) for a 1987 Honda trx250x my friend took out the pilot screw and messed up the tune it has stock jets and stock everything even the tires and he wants to do wheelies does anybody have a good tune and i did see that the factory tune is 2 1/2 turns out
 

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Factory tune is not 2 1/2 turns - that is the INITIAL setting - it is adequate for getting the engine started and riding it for about 20 minutes prior to the final setting. Final setting is to turn the screw in by 1/8 turn increments pausing 5 to 10 seconds between turns until the idle drops by 50 RPM - at that point, the screw is turned out one full turn and it is set.

The best air to fuel ratio is 14 to 16:1
 
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