1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 27Get this manual
ENGINE SERVICING (SINGLE CYLINDER) Timing (Single Cylinder)
1Disconnect the spark plug lead wire and remove the spark plug from the cylinder headDisassemble the recoil starter from the engine by removing the four (4) bolts and lockwashers62
Inspect the condition of the breaker points; if pitted or burnt, replacement is necessaryNOTE: Points may be resurfaced (cleaned) by inserting piece of paper between the points and rubbing it against the contact surfaces"SNAP ON Flex Stone" used in conjunction with spray cleaner may also be used to resurface the pointsRotate the crankshaft until the points are in fullyopen positionAdjust the points to .014", using screwdriver and feeler gaugeNOTE: After the points are secured in position, recheck the point gap; tightening the screw may have altered the point gapARCTIC CAT