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Discussion Starter · #1 ·
i am having a ton of trouble getting my 91 250x to start.
i have good spark and it seems like it wants to start, just wont.

it has a .50 bore with 12:1 compression (domed piston) and i have a GNCC race head on it. the head is ported and polished and has everything done but bigger valves.
I was told i should use race gas (108 octane) with this setup, and thats what is the tank.

what can i do to try and start this? i believe that the reverse is bypassed, but not completely sure.
any help would be great!!
 

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Might be a carburetor problem. How long has it been sitting. I would try cleaning the carburetor first and see how it runs.
 

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I agree. If it's been sitting for any length of time, try cleaning the carb.
 

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Discussion Starter · #4 ·
carb is clean it is shooting fuel
i think the jetting might be off and dont know what it should be at.
i also have a 400ex carb that i want to put on it, but dont know what to jet that at either. i know how to work on them, just dont know what jets to use!!
 

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Moose or Billy should be able to help you with the jetting when they get on here. They both fly the 250X.
 

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im having the same problem it has plenty of spark when i kick it it wants to start but never does
not sure whats the matter with it i have a 87 honda fourtraxx 250x somone please help me
 

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Well with an over bore high comp piston and a P&P head you'd probably need a 42 pilot and a 130-135 main.
 

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Discussion Starter · #8 ·
well i also have a 400ex carb that i would like to put on, but dont know what jets to use in it either. any help there?
 

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Somewhere close to what I told you.I think they use the same jets.
 
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