Idle mixture adjustment on an '03 660 Grizzly - ATVConnection.com ATV Enthusiast Community

yamakatz · #1 (**permalink**) 10-08-2009, 02:42 PM

Can someone give me the Idle mixture adjustment on an '03 660 Grizzly? Is 2 1/2 turns out correct?

Thanks!

gaspumpcity · #2 (**permalink**) 10-08-2009, 03:09 PM

The idle air screw adjustment is located at the bottom of the carburetor flat blade screw driver. This is what I do start and warm engine till fan comes on then turn flat blade till engine starts to drop in RPM then turn out till Rpm drop again then correct setting is in the middle. Most air screw adjustments are done this way except pros use a tach. Make sure your idle is set to correct RPM then make your adjustment.

yamakatz · #3 (**permalink**) 10-08-2009, 04:35 PM

Ok, thanks for the info. I am cleaning out/replacing the needle & seat & all other screws in the bowl. That air mixture seems to be tough to get at when the engine is running...

Traildad · #4 (**permalink**) 10-09-2009, 11:37 PM

There is a special tool to adjust it. A screw driver with a 90 degree bend. Twist the handle and the screwdriver blade turns.