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Discussion Starter · #1 ·
have an 06 and 07 honda 250ex just added hmf full exhaust both was rejetted by a shop went from the main 95 jet.. on the 2007 main jet is 125 and that was what hmf said to use,the 06 per the shop ran best with a 122.5 main. well both act like iam hitting the rev limiter at 1/3 - 1/2 throttle in every gear whats wrong running stock air box w/lid per trail riding only pulled plug just a little tan/white around tip of plug still alot of black on plug been ran for maybe 30/45 min..jettting?need help thanks
 

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You have more than the main jet to adjust...
 

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Sounds like you need a little more air. are you running an aftermarket air filter like UNI or K&N? It will make it breath better.
 

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with my mods i only have a 100 main and 45 slow jet.the air fuel screw is on the bottom shaped like a D.need a special tool to adjust.
 

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Discussion Starter · #6 ·
jets

thanks all talked to hmf yesterday they sent wrong sz jet 125.... 100 is the correct sz runs better now and i am looking for that tool to adjust air/fuel screw anyone knows where to get one let me know thanks...
 

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i had to go to honda dealer for the tool.
 
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