1970-1979 Ski-Doo Snowmobiles Service Manual, Page 9Get this manual
2 Mechanical damage may also occurWARNINGS are to be taken seriouslyIn some cases, serious injury or death has been caused by mechanics disregarding similar warningsMACHINE IDENTIFICATION AND PARTS REPLACEMENT
CHAPTER ONE OPERATION Fuel Mixing
WARNING Serious fire hazards always exist around gasolineDo not allow any smoking in areas where fuel is mixed or when refueling your snowmobileAlways use fresh fuelGasoline loses its potency after sitting for period of timeOld fuel can cause engine failure and leave you stranded in severe weather