2141=340
2145=345
2150=350
2149=351
2152=353
2147=346OE
2153=346NE
2150/350 can be broke down to early and late versions. Early versions had a straight open port piston & cylinder that was shared with the 2149/351.
Later versions had the capped port cylinder that was shared with the 2152/353. The 2150/350 used a dished piston, while the 2152/353 have a flat top piston.
A few mixing and matching items:
Early saws used a course self tapping cylinder bolt, while later saws use a bolt with a finer thread, so they obviously don't interchange and you need to keep tract of them or you could screw up the case. This change took place in weeks 40-42 of 2003, on the Jonnys, but much earlier, week 5, on the Huskys. The reason is that they build way more orange than red, and some changes lag until another run of Jonnys is scheduled.
Starters interchange, but again, different thread screws are used on the metal and plastic case saws.
ALWAYS switch earlier saws with the plastic intake boot clamp to the new style metal clamp. This change was done to Jonsered production saws in late 2006, so there's plenty of plastic stuff out there. The partition wall/clamp part number is 537251302. Huskys received this change much earlier in the year, around week 11.
About halfway through 2003, the metal case saws switched to the clamp on air filter still in use. The plastic case saws retained the twist on style.
