1981 Ski-Doo Shop Manual Supplement, Page 86Get this manual
SECTION 04 SUB-SECTION 02 (ELECTR ICAL TEST)
IGN ITION TROUBLE SHOOTIN CHART
If engine trouble is considered to be caused by any defect in the CD .1system, check the system with the following steps
Faulty Check the electric connectors and wires
Spark test
Good Faulty
Clean spark plugs or replace
Check engine cut-out switch
Good Faulty