MS462 Design Changes

[huskihl]

Perché vedendo il carter modello nuovo non lo ha

It’s there on the new model, but it’s on the exhaust side

 

[Mastermind]

Perché vedendo il carter modello nuovo non lo ha

Ha qualcosa di più semplice, ma è verso la parte anteriore della sega.

 

[Matt Schmitt]

Ha qualcosa di più semplice, ma è verso la parte anteriore della sega.

There you go being sophisticated again!

 

[Mastermind]

There you go being sophisticated again!

And stuff !!!

 

[huskihl]

Si

 

[JimBear]

This time of year I help out at a local saw rebuild shop, on my bench are 11 ms462, older style, with cracked pistons, 3 of those also have stripped plug holes too. They are all waiting on cylinders. Sounds like they got 2 years of hard use out of them, all from a tree service company. Rest of the saws im rebuilding are 4 572xp bad crank bearings, and one ms440 in for restoration.
On the 462 subject, I actually see way more of those and 500i's come in that have stripped plug holes than cracked/broken pistons.
I would still own a early 462. But knowing what I know, I would just swap the piston out after a season of full time sawing. It appears that the crack is caused by wear, and excess piston skirt slap. Slapping skirts is my thing so there is that lol

Are the 462’s with cracked pistons all M-tronic ?


Same questions applies to others who have seen the issue.

@huskihl @Mastermind

Are the problem children all M-tronic 462/661 ?

I am guessing that they are in the US since the adjustable carb version of the 462 had to come from out of country.

I am unsure of what the have over where @markds2 is ?

I am just curious as to any correlation between carb setup/failure ratio ? It doesn’t appear to be a massive problem but just curious. I would imagine that the operator has more to do with it than carb type. Maybe they all start chitting the bed at 1000 - 1200 hrs.

 

[huskihl]

Are the 462’s with cracked pistons all M-tronic ?


Same questions applies to others who have seen the issue.

@huskihl @Mastermind

Are the problem children all M-tronic 462/661 ?

I am guessing that they are in the US since the adjustable carb version of the 462 came from out of country.

I am unsure of what the have over where @markds2 is ?

The only ones I know of were mtronic, but the carbed version wasn’t readily available here then, either. The design change came around at a similar time as the standard carb 462 became available here

 

[JimBear]

The only ones I know of were mtronic, but the carbed version wasn’t readily available here then, either. The design change came around at a similar time as the standard carb 462 became available here

I knew they made the 661 standard carb available again here but wasn’t aware the made the 462 standard carb available here.

Thanks Kevin

So we can know start the debate about standard carb vs m-tronic on piston failures in Stihl saws…

Aren’t there some Stihl Kool-aid guys in Europe that can shed some light on this ?

Isn’t @BonScott46 one of them ? If not I humbly apologize for any hurt feelers.

 

[BonScott46]

I knew they made the 661 standard carb available again here but wasn’t aware the made the 462 standard carb available here.

Thanks Kevin

So we can know start the debate about standard carb vs m-tronic on piston failures in Stihl saws…

Aren’t there some Stihl Kool-aid guys in Europe that can shed some light on this ?

Isn’t @BonScott46 one of them ? If not I humbly apologize for any hurt feelers.

Not following? Standard carb models are still not available here in Sweden to the best of my knowledge. Southern Europe is another matter.

 

[huskihl]

I knew they made the 661 standard carb available again here but wasn’t aware the made the 462 standard carb available here.

Thanks Kevin

So we can know start the debate about standard carb vs m-tronic on piston failures in Stihl saws…

Aren’t there some Stihl Kool-aid guys in Europe that can shed some light on this ?

Isn’t @BonScott46 one of them ? If not I humbly apologize for any hurt feelers.

I think it’s from the first version wanting to cut up around 11,000 RPMs. Everyone said from day one that it was pretty high strung

 

[huskihl]

I knew they made the 661 standard carb available again here but wasn’t aware the made the 462 standard carb available here.

Thanks Kevin

So we can know start the debate about standard carb vs m-tronic on piston failures in Stihl saws…

Aren’t there some Stihl Kool-aid guys in Europe that can shed some light on this ?

Isn’t @BonScott46 one of them ? If not I humbly apologize for any hurt feelers.

Also, I believe the standard 462 is the only one readily available here now, due to the shortages of MTronic wiring harnesses from Ukraine

 

[farminkarman]

Also, I believe the standard 462 is the only one readily available here now, due to the shortages of MTronic wiring harnesses from Ukraine

My dealer can't even get 462's or 400's. He has been able to get 500i's and adjustable carb versions of the 362....haven't seen 261's in a long while either.

 

[JimBear]

Not following? Standard carb models are still not available here in Sweden to the best of my knowledge. Southern Europe is another matter.

I was just curious as to whether or not they having issues with cracked pistons in the 462 in your neck of the woods ? I couldn’t recall what areas only allowed M-tronics vs adjustable carbs.

 

[Mastermind]

I doubt the piston cares if its m-tronic or not.

 

[BonScott46]

I was just curious as to whether or not they having issues with cracked pistons in the 462 in your neck of the woods ? I couldn’t recall what areas only allowed M-tronics vs adjustable carbs.

No idea, i doubt there are many pros running Stihl let alone 462's in my area to be honest.

 

[Funky sawman]

Are the 462’s with cracked pistons all M-tronic ?


Same questions applies to others who have seen the issue.

@huskihl @Mastermind

Are the problem children all M-tronic 462/661 ?

I am guessing that they are in the US since the adjustable carb version of the 462 had to come from out of country.

I am unsure of what the have over where @markds2 is ?

I am just curious as to any correlation between carb setup/failure ratio ? It doesn’t appear to be a massive problem but just curious. I would imagine that the operator has more to do with it than carb type. Maybe they all start chitting the bed at 1000 - 1200 hrs.

I haven't had the luck of turning wrenches on a non mtronic 462. I'm pretty sure the non mtronic 462 in the USA are all the newer version (ones that were sold here)

 

[Funky sawman]

I got to see first hand some of the groundies running saws locally yesterday. They start the saw cold, i know this because I watched them get out of their rigs and gear up, then start the chipper. As soon as the saw fires, it's running wide open trying to break down the limbs and wood to manageable pieces to feed into the chipper.
I watched for an hour or so, the saws get run about 1 minute at a time, then shut off, to feed chipper, then repeat. I can tell you from my own observations of running any 2 stroke in the cold, that these cold starts and tight piston to cylinder tolerance will cause excess wear and premature failure.
I'm willing to say this is not the cause of the cracked piston 462 blues, but it sure don't help things.

 

[qurotro]

I doubt the piston cares if its m-tronic or not.

I agree.. And if my memory is right, you've port a few standard carb 462s from Greece.

 

[Mastermind]

I agree.. And if my memory is right, you've port a few standard carb 462s from Greece.

And from the US.

 

[Hundred Acre Wood]

I doubt the piston cares if its m-tronic or not.

Just thinking out loud though, the Mtronic does control the high limit and the mixture right?

What if the Mtronic runs it closer to the RPM / lean limit?

There is certainly a threshold that if you run up against long enough you're going to do some damage.

Pure speculation on my part; just a thought.