365/372 tuning advice....

[wisecobandit]

Right after a bit of advice really, to cut a long story short ive got a husqy 365 special in my collection which i was going to upgrade via the 372 p and c.

So off i went, found an NWP on the bay of e in america and bobs my uncle.... well that was until it turned up.

Good quality finish etc no complaints there but oh hang on its an open port???? So now im in a predicament. The 365 has only ever cut down about 10 trees in its life so is hardly worn in and is closed port.

Now im thinking i maybe better off just porting/tuning/muffler mod the 365 cylinder as i think it would prob produce if not as much but more power than the open port 372 p and c?

Whats your views and why?

I was hoping for the 372 mod simply as i already have a 357xp etc so wouldve been nice to have a bit more of a cc gap between.

[spudulike]

Right after a bit of advice really, to cut a long story short ive got a husqy 365 special in my collection which i was going to upgrade via the 372 p and c.

So off i went, found an NWP on the bay of e in america and bobs my uncle.... well that was until it turned up.

Good quality finish etc no complaints there but oh hang on its an open port???? So now im in a predicament. The 365 has only ever cut down about 10 trees in its life so is hardly worn in and is closed port.

Now im thinking i maybe better off just porting/tuning/muffler mod the 365 cylinder as i think it would prob produce if not as much but more power than the open port 372 p and c?

Whats your views and why?

I was hoping for the 372 mod simply as i already have a 357xp etc so wouldve been nice to have a bit more of a cc gap between.

 

You have pretty much answered your own question, personally I would always stick with an OEM cylinder unless it is completely FUBARed!

 

The 372 was never open port and closed port is by far the better of the two but many aftermarket Chinese parts are the cheaper open port - got caught like that with a 346XP - never did use the spare P&C as it was open port!

 

I would reckon the 365 will pull harder in the cut than the aftermarket 372 - one of the problems with the aftermarket kit is that the pistons are a bit sloppy in the bore as they are not made to the same tolerances as the Mahle original.

[wisecobandit]

Ok thanks Spud, just nice to have a bit of reassurance im going to do the right thing. The 372 p and c can sit on the shelf as back up and atleast i got some spares bits like gaskets, muffler, inlet manifold etc as spares.

I want to fit new p and c to the 357 also as starting to get weak on the compression side of things although still runs strong. Looks like a morning tickering with saws next weekend lol...

[spudulike]

Ok thanks Spud, just nice to have a bit of reassurance im going to do the right thing. The 372 p and c can sit on the shelf as back up and atleast i got some spares bits like gaskets, muffler, inlet manifold etc as spares.

I want to fit new p and c to the 357 also as starting to get weak on the compression side of things although still runs strong. Looks like a morning tickering with saws next weekend lol...

 

On the 357 - just measure the piston up - worth fitting a new Meteor on and seeing if that peps it up a bit - much cheaper than a new OEM P&C and it is generally the piston that wears.

[wisecobandit]

Ok thanks. Bit of an old faithful saw so has done quite a bit of work in its time and amazes me how strong it still is regardless of compression getting low. I need to strip it as belive that there's a possiblity of 2 choices of piston size and small end size. Not entirely sure of age as no plate but imagine its an early one so the smaller of the 2 choices. May give it a light port job to whilst its all apart.I assume they respond quite well Spud?

[spudulike]

Ok thanks. Bit of an old faithful saw so has done quite a bit of work in its time and amazes me how strong it still is regardless of compression getting low. I need to strip it as belive that there's a possiblity of 2 choices of piston size and small end size. Not entirely sure of age as no plate but imagine its an early one so the smaller of the 2 choices. May give it a light port job to whilst its all apart.I assume they respond quite well Spud?

 

The 357XPs respond very well to porting, the ports can be really opened up.

 

If your saw has an "A" cylinder, you could fit a "B" piston, this can really up the compression as the piston will be slightly oversize and will work on a bore that has done a lot of work. Other than that, just fit the AB or B - often depends on what you can get hold of!

[wisecobandit]

Well ive actually ordered a 359 p and c already tho ive since read on a USA site theres possibly a difference in size of the small end? Never heard it ever before so maybe someone barking up the wrong tree, well thats what im hoping... I tend to be to impatient and want the parts in advance before rebuilding so i can just crack on and get it done tho spanners do get thrown in the works sometimes...

Just rebuild a very clean 1985 husqy 50 and what a pita that was. Think i could answer just about any question now on them sods....i always thought up to now the older stuff was easier to rebuild but how wrong i was.

[Garyjp]

Im afraid there is indeed 2 sizes. 13 and 15 mm from memory.

If you get unlucky you will get the wrong one, dont be tempted to fit if its not right...it will fail eventually!

 

Later 357s have the wider small end.

 

I hope ur luck is better than mine! I know which one id end up receiving lol

 

 

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[wisecobandit]

Well, checked tonight and it seems the change was week 3 of 2002. Luckily this saw is week 30 of 2002 so maybe for once I will get away with it lol. Fingers crossed....

[Chris Sheppard]

Well ive actually ordered a 359 p and c already tho ive since read on a USA site theres possibly a difference in size of the small end? Never heard it ever before so maybe someone barking up the wrong tree, well thats what im hoping... I tend to be to impatient and want the parts in advance before rebuilding so i can just crack on and get it done tho spanners do get thrown in the works sometimes...

Just rebuild a very clean 1985 husqy 50 and what a pita that was. Think i could answer just about any question now on them sods....i always thought up to now the older stuff was easier to rebuild but how wrong i was.

 

Even if it does fit, I'm pretty sure the 359 is open ported. That said, my 2159 Jonsered (same as 359) isn't a bad saw, just not quite as punchy as a 357.