1969 Ski-Doo Snowmobiles Service Manual, Page 73Get this manual
SECTION 4: ACCELERATING PUMP SYSTEM
TRaUB LE
lLean acceleration
CAUSE Incorrect adjustment Dirt in acceleration fuel channels
REMEDY Readjust Blowout all channels in the metering diaphragm cover and the accelerating pump outlet in the carburetor body Replace this assembly
Accelerating pump assembly damaged or worn Diaphragm cover plug screw loose or missing Power valve ball check stuck closed
Tighten or replace