2009 Arctic Cat 150 ATV Service Manual, Page 10Get this manual
7Clean any dirt or debris from inside the air cleanerMake sure no dirt enters the carburetor8Place the filter in the air filter housing making sure it is properly seated and secure with the clamp9Install the air filter housing cover and secure with the retaining clips; then install the seat making sure it locks securelyCHECKINGDRAINING DRAIN TUBE Periodically check the drain tube for gasoline or oil accumulationIf noticed, remove the drain tube cap from beneath the housing and drain the gasoline or oil into suitable container; then install and secure the tube cap TR047
3Using socket and ratchet on the flywheel nut, rotate the crankshaft so the "T" mark on the flywheel aligns with the index mark on the right-side crankcase cover
ValveTappet Clearance
To check and adjust valvetappet clearance, use the following procedureNOTE: The seat assembly, side panels, and gas tank must be removed for this procedure