1969 Ski-Doo Snowmobiles Service Manual, Page 47Get this manual
acceleration, the fuel does not vaporize immediately as the throttle shutter opens, lean mixture will result and create situation known as flat-spot REMARK: For maximum performances, fueZ with Zow voZatiZity
and high Zead content shouZd be usedOverchoking or too rich mixture wiZZ cause carbon buildup and varnish deposit on the piston and rings
TILLOTSON CARBURETORS
The Tillotson carburetors are dependable and trouble-free, providing correct maintenance, care and serviceThe following pages show the proper steps to inspect and repair the various models of carburetors used on the Bombardier Ski-DooThe Tillotson carburetor is very simple multi-purposes unit which performs basic operations: FUEL FILTERING: fuel filter removes dirt particles and residues from the fuel systemFUEL PUMPING: fuel pump' supplies gasoline to the carburetorFUEL METERING: carburetor or metering device injects the proper quantity of fuel into the engine