1997 Ski-Doo Factory Shop Manual Volume Three, Page 64Get this manual
Section 03 ENGINE Sub-Section 02 (599, 699 AND 809 ENGINE TYPES)
NOTE: Engine must be removed from chassis to perform the following procedures
1, Reed Valve
With blade stopper removed, check reed valve for proper tightnessThere must be no play between blade and valve body when exerting finger pressure on blade at blade stopper locationIn case of play, turn blade up side down and recheckIf there is still play, replace blade andor valve body
CLEANING
Discard all oil seals, gaskets, O-rings and sealing ringsClean all metal components in non-ferrous metal cleanerUse gasket remover (PN 413 7085 00) accordinglyRemove old paste gasket from crankcase mating surfaces with Bombardier gasket remover (PN 413 7085 00)-
CAUTION
Never use sharp object to scrape away old sealant as score marks incurred are detrimental to crankcase sealing