2004 Ski-Doo Racing Handbook, Page 248Get this manual
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SECTION 08COMPETITION PREPARATION
std 25 2.0 std
minimum 100 octane 20 teeth PN 504 074 800 43 teeth PN 504 148 600 72 links PN 504 151 883 TRA III 419 PN 417 222 557 no3 PN 417 222