I think that I have an issue

[DX250]

I will start out with this saw is a new to me running Stihl MS 460. Well sort of running it has a wandering idle. I was assuming it was some sort of air leak or a carb rebuild/replace. In the tear down to replace seals and the rubber bits I found this behind the carb.

Being the first 2-stroke that I have torn down in any way I figured I would consult the experts but I am thinking I am looking at a new top end

 

[HarleyT]

Hard to see, here it is blown up a tad.....

A splash of Lucas oil should fix it.....

 

[a. palmer jr.]

Most if not all the Stihl cylinders have the number cast into the side of it. It will also say Mahle on it who I think is the manufacturer. If you don't see any of that it's probably aftermarket. I'm kinda concerned about what's inside the intake port, does it look like something's broken in there or not?

 

[DX250]

The section on the right, between the rings seems to be missing.

 

[a. palmer jr.]

That's what I was thinking but I would have thought that would affect more than the idle. It wouldn't have to be aftermarket to do that, I've seen many Stihl pistons turned into trash also..

 

[DX250]

I have yet to put chain to wood with this saw. I was told about the idle issue and figured fix it before it gets burned up.

 

[rattler362]

It is seen this 2 or 3 times lately

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[blsnelling]

You need a new piston at a minimum. Don't start it again until resolved. If the cylinder is salvageable, a new OEM piston is <$50.

 

[DX250]

I had a feeling. I will preface the next question with. I have a 396 in a Jeep. Are the 54mm kits worth while. I will be using this saw for mostly milling.

 

[blsnelling]

Do yourself a favor and stick with a Stihl with an OEM cylinder. Unless you really know what you're doing, aftermarket it hit and miss.

 

[a. palmer jr.]

I get by with aftermarket P/C kits but I don't run mine constantly and don't work them hard...mostly homeowner stuff.

 

[blsnelling]

If you know what you're doing and are on a budget, there are some decent kits out there. If need be @Definitive Dave will help you out and steer you right.

 

[a. palmer jr.]

Milling sounds like it would be hard on a saw. I wonder why people don't just use the round saw blade milling equipment, maybe too expensive?

 

[Cease232]

I'd be surprised if that cylinder isn't trashed. That's a big piece of metal to be floating around in there.


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[HarleyT]

Piston Assy. #1128 030 2009 is only $41.49 from Stihl.

 

[rattler362]

I have saw this before that didn't trash the cylinder now not saying this one isn't.

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[DX250]

Yeah just made a run to a certain orange store to get a torx bit long enough (out of stock) to pull the cylinder. I figure that I will just go with OEM. I do have a dealer within walking distance.

 

[Cease232]

Anythings possible and I certainly hope it didn't for the OP's sake.


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[DX250]

I am just going to order a new piston and cylinder kit, rubber bits and anything else that I see worn. I know this saw has a lot of hours on it so I might as well do it all while I am in there. At least I got a good deal on the thing.

 

[Cease232]

I would at least pull the cylinder first. If it ain't broke don't fix it. IMO you'd be Better off just putting a new OEM piston if that's possible.


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