[keith450]

Where is the air adjustment screw on the YFZ450 carburetor??
I rejetted to a 165 main and want to reset the air screw
to obtain the best off-idle performance.

Thanks

 

[AlaskaYFZ]

Air screw is up in a "tube" on bottom of carb motor side/front.........JIM

 

[edgerat]

it isnt an AIR screw it is a fuel mixture screw. The air screw is on the filter side of the carb.
Isaac