Lunchbox and Jetting, Quick questions!

[tireeater]

hey guys i have read most these pages and still havin a problem with my bike not wanting to idle. i have a k&n drop in and a delkavic exhausted with out the silencer. i have 140 main jets and the rest of the jets are stock. i have tried moving the throttle sensor thinking it help with the timing, Ive adjusted the air/fuel mix screws. nothing seems to help. i have to hold the throttle at 2 grand to keep the bike running. As soon as i let off it dies. its an 04 500f, american version. please help!!!! my brain hurts from thinking about all the possible issues.

[radodrill]

hey guys i have read most these pages and still havin a problem with my bike not wanting to idle. i have a k&n drop in and a delkavic exhausted with out the silencer. i have 140 main jets and the rest of the jets are stock. i have tried moving the throttle sensor thinking it help with the timing, Ive adjusted the air/fuel mix screws. nothing seems to help. i have to hold the throttle at 2 grand to keep the bike running. As soon as i let off it dies. its an 04 500f, american version. please help!!!! my brain hurts from thinking about all the possible issues.

Sounds like your idle may be way lean; with the drop-in and stock pipe (2009 US model) I was running 20/60/142.5 jets with 2.75 turns, after I custom fit a new can I went to 22.5/62.5/142.5 with 2.75 turns.

Also, be sure your throttle stop is set so it keeps the butterflies open a little bit.

[tireeater]

thanks man, do you think a 20 piolet jet will be to small?? and your right about the butterflies, i have playing with them so it would idle alittle but it never helped so it all outta wack.

[Jayke]

From what I have learned it's different for each bike and location I guess,  cause crasms was great with the setup, but wasn't perfect for me since we live in different altitudes I guess

All I can say is try out different jets and combinations to find what's best for your bike.

Rado will give you an estimated set of jets though!  Should be something similar to what I've been using though!

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[tireeater]

thanks for the help guys. i live in Cincinnati, ohio. so everywhere i go the altitude is different. it like our weather. sunny and 80's one day and 35 and snowing the next. is crazy. but ill keep yall updated and see if i can get it fixed.

[Jayke]

Good luck!  Patience is key! I've had mine open like 20 times now and still not perfect

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[radodrill]

From what I have learned it's different for each bike and location I guess,  cause crasms was great with the setup, but wasn't perfect for me since we live in different altitudes I guess

All I can say is try out different jets and combinations to find what's best for your bike.

Rado will give you an estimated set of jets though!  Should be something similar to what I've been using though!

There are a lot of things that factor in; altitude does have some effect, but I'm not sure how significant it is, it could very well be something that can be compensated for on the mixture screws.

Another factor is of course personal preference and riding style; tamer riders might want to go lean for better fuel economy.

From what I've found, the intake is the predominant factor for the ideal main as that's the bottleneck for air flow into the engine; changing the exhaust doesn't seem to significantly affect the WOT and top end behavior.  The exhaust seems to mostly affect the idle and low end transition regions.