1999 Ski-Doo Factory Shop Manual Volume Two, Page 131Get this manual
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Section 04 ENGINE Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
ENGINE TYPE 443 503 494 583 670
DIMENSION mm (in) 20.8 (.82) 18 (.71) 30 (1.18) 27 (1.06) 29 (1.1