Chainsaw Repair

I cant remember anymore.  Husqvarna 266 thin ring piston and Jonsered 630 thin ring pistons the same?

I want to say yes but need to be sure.

Is the 630 thin ring 48mm and the 266 thin ring 50mm? 

Info from spike60

There is really no difference between the SE and XP models. This just happened to be the time when Husky adapted the XP designation for their pro saws. Some 266's will have SE on the serial number plate, but XP on the top and starter covers.

XP originally stood for Xtra Power, and I suppose still does but you don't see it mentioned very often.

I'm pretty sure the only saw with the metal fuel tank was the 162SE which was the first saw on this chassis. That was the thin ring model, and it's jug and piston were shared with the Jonsered 630. The 630 continued in the Jonsered line right up until that entire saw family was replaced by the 371/2071 chassis around 1997. The Husky 262 was of course on a completely different chassis.

One thing that catches a few guys by surprise is that the early plastic tanks used the same mounts as the metal tank saws. They had a fine thread that screwed into metal inserts in the tank. (often the case with white top 61's) The later saws had the more common mounts with courser threads that screwed directly into the plastic.

Mise well save them anyways.

Husqvarna 266 IPL  http://www.husqvarna.com/ddoc/HUSO/HUSO1982_USen/HUSO1982_USen_O8200002_.PDF

Jonsered 630 IPL  http://www.jonsered.com/ddoc/JONI/JONI1987_AAaa/JONI1987_AAaa_I8700004_.pdf

Only the early 630's had the thin rings. Not sure when the switch was made, but I think I have the service bulletin somewhere. Later single coil saws all had the single ring. (same item that was used on the 2165/365).