Stihl MS 461

[jmester]

I got some problems. Had to drive the piston out of the cylinder.

 

[Armbru84]

No good.

 

[Frank bierce]

Ouch.....

 

[Canadian farm boy]

That would definitely ruin my day.

 

[ranchdadmike]

Dang. Sorry for your loss


Sent from my iPhone using Tapatalk

 

[Frank bierce]

Lose part of the lower end bearing?

 

[jmester]

It is not mine. It is a good buddy of mine saw. It is the first I have seen a oem Stihl cir clip fall out.

 

[jmester]

Look in pic 1 that little wire piece is the circlip.

 

[Frank bierce]

Maybe I should look with my good eye next time...lol...

 

[Cracker Boy]

That hurts

 

[Wilhelm]

Is it just an optical illusion or is the cylinder scored - beside the circlip scoring mark that is?
Second picture, left to the circlip tear mark, intake side.

Nice paperweight, I'm glad it isn't Yours.

 

[jmester]

The cylinder is scored as well. There is no way that is going to clean up.

 

[jmester]

Maybe I should look with my good eye next time...lol...

That would have been a hard guess to tell from the picture. I thought it was a piece of the bearing as well at first but everything on the crank felt nice and smooth. Then I got looking at the piston and realized the circlip was gone on the pto side. It also broke the flange or stuffer at the bolt flanges as well.

 

[TJ the Chainsaw Mechanic]

New cyl/piston in order. Least there was no lower end damage?

 

[jmester]

Yes new p and c should be all that it needs. Need to wash out the bottom end just to make sure all is well.

 

[Wood Doctor]

Yes new p and c should be all that it needs. Need to wash out the bottom end just to make sure all is well.

Correct. I've rebuilt half a dozen 046, 460, and 461's with new piston and cylinder kits. It's amazing how many get burned out one way or the other. It's still a good saw and I still love my 046 Mag.

 

[jmester]

I like the 046/460 saws. I have no run time on a 461 but seems like a nice saw for what I have seen taking it apart.

 

[MustangMike]

I have seen a higher percentage of fails on the 461s (compared to 046/460). I think it is because, stock, they run a higher temp to meet emissions. The sole purpose of that defector under the piston is to cool the piston.

I always drill 2 - 1/4" holes on the top right of the muffler cover then remove the limiters on the carb. Usually the tune (after that) is Lo 1 turn, Hi 1 + 1/16, but always check tune by ear.

I think they hold up much better after the modification, and the guys like the way they run better also.

I believe that scoring on the intake side is reflective of a poor mix. My guess would be that contributed to the clip failure.

I got lucky and found a good used cylinder on ebay a few weeks ago, they are tough to find. Also put a Meteor piston in it. The saw I fixed was run with the air filter loose, plus the stripped the plug thread, and the plating was NG.

This was what the piston looked like:

 

[drf256]

I got some problems. Had to drive the piston out of the cylinder. View attachment 96364View attachment 96365

That can be cleaned up IMHO.

 

[Mastermind]

That can be cleaned up IMHO.

I agree.