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06 crf 250 rejetted and doesn't idle without choke

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previously was jetted with a 175 - 42 - 3 turns. Honestly I don't know why it was at that... seems a little much, it ran kinda crappy as you can imagine. It still did not idle with that jetting. I rejetted it to 170 - 40 - 2 turns, the bike runs great, but still does not idle without the choke on. The throttle response is good, blasted out the carb with carb cleaner a few times. There is a crack in my FMF pipe, which may be causing a compression problem???? I will get that fixed this weekend, what else could be wrong with it? ****it has a brand new pilot jet in it, BRAND NEW***** everyone keeps saying pilot jet is clogged :banghead:  :banghead:  :banghead:  :banghead: .... I really do not think that is the problem.... but what do I know I just read the manual and install the new parts....

 

What could be the possible problems?

Why would the bike be jetted that way previously? (it is a modified bike, so I guess that is why)

 

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fix that cracked pipe

blow out the pilot jet

blow out the pilot jet passage

if its still giving you trouble check for an airleak

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