I am looking for some help- I have a Honda CM250 engine (twin motorcycle) that Im using for a project. The carb it has on it, stock, will idle it fine but chokes and belches raw gas when tried to rev.. I had the bright idea to use a new 300EX carb on it- which I know is a good carb. It idled great, but would flood out and blow gas fumes at anything over an idle- it really wouldn't rev up at all.

ANY help with this would be great- I bought some smaller 300ex carb jets, they said it had a 138 stock, I got 3, a 137, a 127 and a 125, in hopes I can lean it out enough to use that carb till I figure the stock 250 carb out.

thanks in advance

 

Anybody??

Anything will help- websites with info, anything

 

Can ANYBODY please, give me a link where I might find a carb diagram for this carb? Or some form of online help- please! [img]i/expressions/face-icon-small-smile.gif[/img]

 

wait untill tonight seems like honda questions get answered later.

 

Thanks!, Im just impatient, I'll be leaving work soon and was gonna attempt to mess with it again this evening, was wanting all the help I could get.

 

try the smaller jets and move the clip around. also screw the air/fuel. hopefully you get it.

 

See there's no clip on the 250 carb, No adj. screws at all- cept for one on the bottom right before the intake. The 300ex carb I havent messed with yet, just stuck it on to see how it did. I'll try the jets, hopefully it will work after that. Then I can work on my charging system(which doesnt work either [img]i/expressions/face-icon-small-sad.gif[/img] ). Thanks man

 

The stock 300ex carb should have a 122 main jet. You are on the right track in thinking its rich. Try a smaller main then a 122, maybe110 or so. good luck

 

make sure your float isnt stuck.