2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 72Get this manual

2006-2008 Yamaha Snowmobiles Apex/Attak Factory Service Manual, Page 72

CARBURETOR TUNING Trouble Poor performance at mid-range speeds: Momentary slow response to the throttle Poor acceleration
any obstructions (e.g ice)Clean and adjust the carburetorsClean the carburetorsClean or replace the fuel lineClean the air
ventS Disassemble and clean the float valveS Do not scratch the valve seatS Clean or replace the float valve and valve seatS
The valve seat and body must be replaced as set Replace the floatCheck and, if necessary, replace the following parts: Float
tang Float (entire assembly) Arm pin Lean mixture Clogged air vent Clogged or loose main jet Overflow Poor performance at
high speeds: SP Power loss Poor acceleration Starter valve is left open Clogged air vent Clogged or loose main air jet Clogged
fuel line Dirty fuel tank Air leaks into the fuel line Low fuel pump performance Clogged fuel filter Clogged intake Abnormal
combustion: Lean mixture Backfiring Dirty carburetors Dirty or clogged fuel line Overflow: Poor idling Poor performance at
low, mid-range, lo mid range and high speeds Excessive fuel consumption Hard starting Power loss Poor acceleration Clogged