Chainsaw Repair

I got the clutch springs replaced. What a pain in the neck those little buggers are!

As I pulled that off, I realized the sprocket was getting to the point where it should be replaced. No problem, I keep a spare. I pulled out the spare sprocket I had in my box of parts. No dice: the ID was larger than the splined shaft on my clutch drum. So I checked the parts manual Cut4Fun sent me. It called for a Husqvarna part 501 59 80-02. None of the stores nearby me had one, so I ordered a couple online. This is supposedly the equivalent of the Oregon 68210, a 3/8, 7 tooth standard spline, and the Oregon site confirms that the 68210 should fit the 357XP.

It appears I actually need a 3/8", 7 tooth, SMALL spline, since the ID of the sprocket is about 3/4". (I did get it used, and have been using it for years now. I guess the previous times I replaced the sprocket, I must have just brought them to the saw shop and said "give me one of these".)

So did some Husqvarna 357Xp saws get made with a different set-up, or do I have a saw that has been bastardized over the years.