2005 Ski-Doo Racing Handbook, Page 142Get this manual
SECTION 05ENGINE PREPARATION
Carburetor Test
Once the aperture of the carburetor is determined, test to select the proper jet should be madeThe size of the jet is determined by measuring the output in bench or in chassis dynamo testFor racing, it is best to determine the proper size of the jet on the racing track, because the following points must be taken into account: aThe altitude (atmospheric pressure), temperature and humidity of the race trackbThe operation of the engine based on the topography of the race track