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Old September 1st, 2020, 10:32 AM   #7
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

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MOTY - 2018, MOTM - Nov '17
Quote:
Originally Posted by Nicosiacustom View Post
Im having the same problem on my 06 i have a jet kit installed no vacuum leak didn't have the problem till after the jet kit was installed. Im leaning towards the fuel filter or the air valve for the tank its almost like its not filling the bowl fast enough and the idle will go from 1500 to 500 and back between 1500 and 2000 dont know if yours is the same but if it will help ill let you know if i figure it out.
If fuel-flow is not sufficient for idle, bike would not run at all at higher-RPMs.

Did you check valve-clearances? What are they?
Which jet-kit did you install and which jet-sizes?

Really need wideband-O2 datalogs or dyno-testing to tune with jet-kit. Otherwise, there's absolutely zero way you can determine what jetting changes are needed.

Bet if you go back to bone-stock, idle will be perfectly fine.

Last futzed with by DannoXYZ; September 1st, 2020 at 11:55 AM.
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