One-piece spur sprockets are durable, economical and simple to use. Unlike rim sprocket systems, the chain-driving teeth and the clutch cup are combined into a single unit on spur sprockets. OREGON spur sprockets are available for all types of chain saws.
This fits Poulan 3416,3816,4018,4218
Check bar or sprocket for info to confirm if you have 3/8 pitch like this sprocket.
3/8 pitch 6 (91) tooth crank shaft diameter is 0.5