I have recently bought a WR450 after fixing the water seals and the impeller as it snapped, and starter damper as its a 2003, i finally got a chance to go out onit i cleaned the carb out aswell.
My mods are....
De snorkled air box
Throttle stop off
Leo vinici exhaust
Vortex tuning box
As im sitting at 30mph holding the throttle the bike feels like its coughing or jerking, at full revs it seems ok just the holding the 30mph which it hates. Also when i let off the throttle it back fires like mad, i have checked for exhaust leaks and everything seems fine.
The main jet i noticed is 160 from reading i have now purchased a 168 main jet, and a 48 pilot jet. Does this sound about correct?
Also on the bottle of the carb there is a red turnable mixture screw im guessing, im going two turn that full turns out
Chee.rs for the help