crf 250 r running rich or lean? 2006

[merky369]

hi guys got teething issues with my crf ..

got carb at stock jets . stock needle postion. stock screw position.

the problem im having is around idle.
it seems to want to hang on to idle after a rev....
but.. if i pull the hot start lever it brings it straight down to tick over smoothly??

i saw someone say that there is a throttle seal that tends to go on these carbs and causes to hang on to idle. but i want to be sure this is my problem before i go wasting money on parts not to fix the issue..if this was the case my question is? wouldnt it want to hang onto idle alll the time? where as if i pull the hot start lever it manually brings it down to normal idle speed quickly ... could this be a sign im running rich? and me pulling the hot start lever is equalling the ratio to make it work as it should.. if this is the case what would i do to adjust the mix??

thanks for reading and and responce will be appreciated thankyou all
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hear the ping? see the smoke? youve been passed, by a two stroke!

[Fizzer Thou]

It does sound as though it is running lean and by actuating the hot start button you are enrichening the mixture so as to get it to run.

The carb is quite complicated and whenever I have had the same type of device apart from my KTM enduro I have been very mindful of the number of parts involved

https://www.fowlersparts.co.uk/parts/4879461/crf250r6-2006-ed-cmf/carburetor

Have you tried spraying some WD40 around the inlet manifold while the engine was running?If the revs rise while spraying it would suggest that there is an inlet leak and I would look seriously at the rubber manifold for any cracks.Easy and cheap to replace

Part #5 on the fiche

https://www.fowlersparts.co.uk/parts/4879445/crf250r6-2006-ed-cmf/cylinder-head
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Always have a 'Plan B'