MS462 Design Changes

[Mastermind]

I always thought they needed a little less exhaust duration even after machine work, that’s for sure

They are very considerate. Making our jobs easier.

 

[BonScott46]

I always thought they needed a little less exhaust duration even after machine work, that’s for sure

Have you noticed a difference when running them stock?

 

[huskihl]

Have you noticed a difference when running them stock?

Yes. They aren’t quite as jazzy.

I don’t mean that in a bad way. Just maybe a chance for a different recipe. Before, I could only port them 1 way because I refused to raise the exhaust on them to make them more peaky. Now we have options

 

[huskihl]

Is there any way to prevent it from happening on all the old version saws out there? Can the new piston be installed in the old version saw to fix it?

Need to quit doing the reset every time they use them and quit piss revving.

The 461 and 661 will do the same thing if they’re held wide open out of the wood long enough. The deflector hits the inside of the piston

 

[MustangMike]

There’s a chunk that’s cracked.

I saw that, just wondering why it happened. Excess heat may have something to do with it.

Glad to hear that my ported saws are likely corrected!!!

 

[RI Chevy]

Just a poorly designed piston Mike. Metal is too thin. They should have picked this up and corrected it before it went to market. They do their testing in regions that have all soft wood. About time they send some saws to the USA loggers to put the saws through the paces here. etc...
Looks like they corrected the issues in V2...

 

[sawmikaze]

Just a poorly designed piston Mike. Metal is too thin. They should have picked this up and corrected it before it went to market. They do their testing in regions that have all soft wood. About time they send some saws to the USA loggers to put the saws through the paces here. etc...
Looks like they corrected the issues in V2...

They test saws where the wood is hard...

 

[sawmikaze]

I saw that, just wondering why it happened. Excess heat may have something to do with it.

Glad to hear that my ported saws are likely corrected!!!

How did porting correct it ?

 

[huskihl]

I saw that, just wondering why it happened. Excess heat may have something to do with it.

Glad to hear that my ported saws are likely corrected!!!

The post above yours is why they crack

 

[markds2]

Need to quit doing the reset every time they use them and quit piss revving.

The 461 and 661 will do the same thing if they’re held wide open out of the wood long enough. The deflector hits the inside of the piston

Here are pics of a 461 that came across my bench last year, exactly as Kev says, the deflector under the piston took a knock, disintegrated, and took out the piston - the result is carnage.

 

[sawmikaze]

The post above yours is why they crack

Can you port my 543 to make sure the paint on the clutch cover doesn't fade ?

Thanks, meatloaf.

 

[sawmikaze]

Before guys panic...

There's lots of 462s out there running just fine with the "old" design.

 

[huskihl]

Can you port my 543 to make sure the paint on the clutch cover doesn't fade ?

Thanks, meatloaf.

Lol

 

[sawmikaze]

Need to quit doing the reset every time they use them and quit piss revving.

The 461 and 661 will do the same thing if they’re held wide open out of the wood long enough. The deflector hits the inside of the piston

I guess the reset for m-tron 3.0 was a bad idea...

 

[Stump Shot]

Before guys panic...

There's lots of 462s out there running just fine with the "old" design.

Oops...

 

[huskihl]

I guess the reset for m-tron 3.0 was a bad idea...

Yeah idk. That 5-10 seconds or whatever it is should probably be saved for a last resort.

 

[huskihl]

Before guys panic...

There's lots of 462s out there running just fine with the "old" design.

Great idea for another ‘kaze thread

 

[qurotro]

Here are pics of a 461 that came across my bench last year, exactly as Kev says, the deflector under the piston took a knock, disintegrated, and took out the piston - the result is carnage.
View attachment 331313 View attachment 331314

Any idea where the piston hit? Top or piston skirt?

 

[markds2]

Any idea where the piston hit? Top or piston skirt?

No I don't know, although it was the exhaust side that disintegrated. I think the skirt wear probably got so bad that the piston rocked enough in the bore to hit somewhere.

 

[ZeroJunk]

We have one of the earlier MS462's at work and a new top end has been on order since early December of 2021.
So, I guess my question is will Stihl ever furnish one ? Or, since it is a tree service would paying $400 or whatever for me to rebuild it be a bad investment in a questionable reliability saw ?
I'm thinking of telling them we can't do it whether I can scrounge up a top end or not.
It banged hard enough I had to re-center the crank shaft. May just be a bad idea.