I just put on my full exhaust from graydon and don't have a airbox. and the bike seems to have NO Top end at all and back fires when I let off the throttle. I have 180/185 jets in it. Was wondering If anyone else has similar probs to these... HELP>.

 

I am willing to bet you have waaaaaaayyyyyyyy too much fuel.

Check the Plug.

 

Without making any changes to the airbox I don't believe that you need to change to anything more than 155/150 if that.

I believe improving a restrictive intake like the Raptors will have a bigger if not huge affect to the jetting.

I believe that the Raptor airbox starts pulling a vacuum at higher rpm which lowers the air density going through the carburetor. If you remove that restriction then the air density going into the engine increases which requires a jetting change similar to going to a different altitude.

 

you wanna go fast????? buy a 2 stroke....end of story,,, or you can waste your money on every little new mod that comes out and then take that mod off and put on the next new one.. This is how it works and companys make tons of money on you. so to be honest, if your serious about going fast, you buy a stroke and then you can really race

 

MELLOW go have a beer or start smoking pot
it's all good

 

ihatemyraptor, i agree with you on the raptor thing but as far as buying a 2 stroke ya lost me thier.I'd rather spend my money on hop-ups then replacing the same old parts all the time like you would with a 2-stroke.

 

lmao

 

I'm running the stock pipes with no spark arrestor and no airbox lid. My jetting is 160/165. It runs perfect in AZ. I hope you meant that you are running with no airbox LID. If that's what you meant then I'd say you are running lean. Look at your plug it tells all.

 

Try putting the airbox lid back on. If it runs better you're too lean, if it run's worse you are too rich.