stumble

[loopy]

hi all i have a question about a stumble i have on my o4 crf250r at just before mid throttle i have a stumble were the motor goes dead then picks up its not a bog were i hear the motor wind down its a dead space then it picks up with no issue and down real low in the rpms is will do the same im new to the 4 strokers please help! as for the mechanical aspect it just came from the honda dealer having done a plug change valve adjustment the air filter is clean
and im left scratching my head ?????

[crfjedi393]

I really have nothing to offer. I own two '04 CRF250R's and have never experienced anything like that. Does this happen with quick and hard acceleration as well as a longer, smoother throttle twist? Have you owned the bike since it was new? Change of elevation?
It is probably jetting. The accelerator pump could be a factor. The smart guys will have something to offer before long.

[loopy]

it happens both ways after further reading im betting a acc pump issue is what im dealing with but if anyone has any insight or tricks please let me know
all in all this bike kicks the 95yz125 i just came off of in the nutts this thing is a blast !!!

[MXtras]

It could be something as simple as water in the fuel.

I would suggest tearing into the carb and doing some housekeeping. It could be simply a piece of trash somewhere.

Scott