Exhaust And Primary Compression - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

Section ENGINE PREPARATION
04

EXHAUST AND PRIMARY COMPRESSION

, F01D6VS
1. Fresh charge forthe other cylinder
2. Intake portcovered
As the piston descends, the intake port is blocked by the rotary valve and pressure begins to build
inside the crankcase (primary compression). The exhaust port is uncovered as the piston continues
its course zdownward, and burnt gases are allowed to escape.
04-30
2