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08 CRF250R missing cutting out at cruise

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My son just bought a 2008 Honda CRF250R. Looks like a pretty good bike but engine history is unknown. It doesn't start the best but maybe not too bad (we don't know what to compare it to). It runs pretty good except for cruising at a steady speed. I live in the country so for example riding down the gravel road at around 40 mph in high gear it runs rough and misses. However, as soon as you accelerate it runs smooth. It idles good. Runs good wfo. I wondered if running a bit lean so we raised the needle 1 notch, no difference. Any ideas on this problem? btw, I think the carb is clean, doesn't appear the bike has sat with old fuel. Thanks in advance!!

Ed in Iowa

Edited by cyclefarm
wrong model in title

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Yeah I wondered about that. I tried choking it a bit and didn't help so you're probably right, might be too rich. We'll try dropping it 2 notches (1 lower than original), will let you know how it works. Thanks!

 

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