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2006 CRf 450 Idle issues

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I have a 2006 CRF 450. Started having problems with the idle. Choke out it want to idle at 3800 to 4000 rpms. When the choke is off it down to 1500 but backfires when you let off the throttle and has a delayed throttle responce. I cleaned the carb and jets and nothing still having the same problem.. Fuel screw is 2 turns out. 

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You 'cleaned the carb and jets'.

 

You can't really clean pilot jets....

 

Fuel screw is designed tune the pilot jet, attaining highest idle.

 

 

 

You need to service the entire carb every year or so.

 

I could go into extensive detail, but I don't know what you will understand.

 

Most likely your hot start is stuck partially open, your slide plate seal is worn out, your acclerator pump diaphragm is worn out, and possibly you apump nozzle is clogged.

 

http://www.dirtrider.com/features/protips/141_0707_keihin_fcr_carb_rebuild/

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