2004 Ski-Doo Racing Handbook, Page 65Get this manual
SECTION 04ENGINE PREPARATION
If the squish clearance is increased, loss in power will occur while too small squish clearance will lead to detonationThe squish clearance can be measured by inserting piece of rosin core solder into the combustion chamber, rotating the engine through TDC, removing the solder and measuring the thickness of the compressed solderThe solder should be inserted above and in line with the wrist pinMeasure the squish on both sides of piston as it may vary from side to side1 2
BOMBARDIER-ROTAX has patented remarkably simple system to automatically change the exhaust port height based on pressure in the exhaust system1 2
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