Inside the MS362

blsnelling · Nov 8, 2009

I've got a MS362 here for mods and though I'd share my findings. This thing is one strange bird. There's very little familiar about it at all. Everything's new. It couldn't be further from a 361. I've not worked on a 441, so no comparison there.

Squish was .027" with the gasket, and .012" without it. Compression was only 130. The saw is not broke in yet, but I'm still suprised at that low of compression. The piston has two 1.2mm rings, with both end pins very close to the center of the skirt.

I'll just kind of take you through the disassembly here.

More to come.

blsnelling · Nov 8, 2009

Jacob J. · Nov 8, 2009

Let us know if you would whether it has the 11mm or 12mm wrist pin...

blsnelling · Nov 8, 2009

What's up with this? Perhaps my guage has gone bad, lol.

The carb box comes off with the removal of two screws.

Can you say Air Injection?

blsnelling · Nov 8, 2009

blsnelling · Nov 8, 2009

Can you say RICH!

blsnelling · Nov 8, 2009

More Air Injection.

blsnelling · Nov 8, 2009

blsnelling · Nov 8, 2009

I forgot to measure port timing before pulling the jug. So the following is with .012" squish and no gasket.

Exhaust 103°
Intake 73°
Transfers 131°

That's it for now.

blsnelling · Nov 8, 2009

Jacob J. said:
Let us know if you would whether it has the 11mm or 12mm wrist pin...

12mm.

Metals406 · Nov 8, 2009

Them guts on that saw look totally weird compared to the other saws :dizzy:

. . . I'm looking forward to your mod and writeup on this animal. :rock:

blsnelling · Nov 8, 2009

Metals406 said:
Them guts on that saw look totally weird compared to the other saws. . . I'm looking forward to your mod and writeup on this animal.

Strato saws are weird for sure. I wonder how similiar this is to the 441? I found the transfers coming from the base of the cylinder rather interesting. All four transfers have their own individual channels. And check out that transfer port timing! Tons of blowdown on this thing.

Metals406 · Nov 8, 2009

blsnelling said:
Strato saws are weird for sure. I wonder how similiar this is to the 441? I found the transfers coming from the base of the cylinder rather interesting. All four transfers have their own individual channels. And check out that transfer port timing! Tons of blowdown on this thing.

I can see that being a big advantage to modding it. . . It seems that's what most guys always want a little more of on a built saw.

blsnelling · Nov 8, 2009

Metals406 said:
I can see that being a big advantage to modding it. . . It seems that's what most guys always want a little more of on a built saw.

Particularly true on piped saws. I'll likely be raising these transfers a little.

Metals406 · Nov 8, 2009

blsnelling said:
Particularly true on piped saws. I'll likely be raising these transfers a little.

Exactly. . . Time and area are your friend.

splitpost · Nov 8, 2009

:jawdrop:Thats one very different looking jigger,can i assume thats a twin throttle type set up, to increase response across the rev range?

stihlavarna · Nov 8, 2009

I've never seen stops on the ends of rings before

Jacob J. · Nov 8, 2009

Brad- great pictures as always. Yes, this one looks like the little brother to the 441. The port arrangement is the same. I believe those upper cut-outs on the sides of the piston help with transfer timing, although I have not been inside a 441 enough yet to have mapped it out.

WoodChuck'r · Nov 8, 2009

Stratos are odd, very odd.

Great pics though.

Andyshine77 · Nov 8, 2009

blsnelling said:
Can you say RICH!

The P&C look similar to the pics of the 441 I've seen. Not to start an oil thread, but what kind of oil was ran in this saw? the combustion chamber and piston crown look horrible.

Inside the MS362

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