need help

[tyman2395]

k heres what my bike is doing it will rev up slowly but if you rev it to fast it will bog out same if i go in second and give it gas plus it backfires to i got a full white bros pipe 450r carb k&n air filter with outerwears filter bag and i am running open lid i need help fast thanks

[tyman2395]

someone please help me

[hoogiesngrinder]

what jets are you running?

[tyman2395]

oh and also it has a stage 2 cam and a 11:1 416 piston in it

[F-16Guy]

Sounds lean. Go up a few sizes on the main and see if it helps.

[tyman2395]

i'm not sure i never took the carb off yet

[hypersnyper6947]

Originally posted by tyman2395
i'm not sure i never took the carb off yet

Sounds like its time to,

its easy once you have it off, on the bottom of the carb you will see where you can unscrew a portion of it, then inside of that is your main jet, i think its a 6mm, unscrew that jet and see what size it is, then buy a couple bigger ones

[tyman2395]

the jet i see is a 118

[tyman2395]

so try a 120?

[tyman2395]

what kind of jet is this it got like a star on it

[Sanddraging28]

its a keihin jet.

i would try a 160 or 162 main jet.
the pilot should be ok.

[tyman2395]

so it would be going from a 118 to a 160? that sounds like alot

[Sanddraging28]

it does sound like a lot.....
I have almost the same setup in my 416 but with a few differences.
i run a 190 main jet with a stock pilot.

[tyman2395]

k so with a 160 man that would be like a 146 dyno jet right cause my friend is bringing me some jets and there dyno jets what sould the air screw be out 2 and half turns?

[Sanddraging28]

thats about right. just make sure that you use the jet adapter. the dynojet jets are shorter. i would put the srcew out about 2 and a half turns out. that should get you real close. let us know how it goes

[tyman2395]

whats a jet adaptor is it that thing that my other jet was connected to? thanks

[Sanddraging28]

kinda. the one that is in your carb now is for keihin jets. to use the dynojet jets there is another adapter that you have to use to get the jets down far enough in the bowl.

[tyman2395]

i put a dyno jet 155 and it seems so work better now

[ae13291]

Originally posted by Sanddraging28
it does sound like a lot.....
I have almost the same setup in my 416 but with a few differences.
i run a 190 main jet with a stock pilot.


what elevation you at that your running a 38 pilot?

[Sanddraging28]

about 350ft