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Old 09-01-2009, 10:19 AM
cowboyona426's Avatar
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Default Chainsaw rebuild

I know, its not a bike, but it's a 2 stroke motor so it's at least semi-related
I bought a Stihl MS460 a while back as a project saw, thinking it only needed a few parts to make a chainsaw of it again. Bought the parts, assembled the saw and started it up... it sounded horrible. Compression was good and it seemed to run good- it revved up normally and had good power, but it sounded like a 4 stroke with terribly loose valves. I pulled the cylinder off and this is what I found:


cylinder


piston crown


exhaust side


intake side


intake side again

I didn't find any foreign objects in the cylinder, cases, or muffler... so what caused the damage? I believe the noise was piston slap looking at the piston (plus the fact that it rocks in the bore) and the ring end gap tells me it was time for some new parts anyways. I just don't want to reassemble the saw and have the piston/cylinder get trashed again. FYI, the cylinder and head are 1 piece.
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Old 09-01-2009, 02:13 PM
merlyn1965's Avatar
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My $0.02? Get a new piston and cylinder as a kit. It work everytime. Might be a little pricey but well worth it. Check your crank bearing if you feel like it. You can get some pretty cheap (around 7$ each at a bearing outlet. Found this on ebay as a kit.
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Old 09-01-2009, 05:21 PM
cowboyona426's Avatar
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Quote:
Originally Posted by merlyn1965 View Post
My $0.02? Get a new piston and cylinder as a kit. It work everytime. Might be a little pricey but well worth it. Check your crank bearing if you feel like it. You can get some pretty cheap (around 7$ each at a bearing outlet. Found this on ebay as a kit.
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I don't think I have much option there... looking more for what caused it to go TU. As far as I can tell all the bearings are fine, they are all smooth and I can't get any wobble out of either end of the crank.
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Old 09-01-2009, 10:48 PM
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Seen a few like this Chase. Actually, one just the other day I worked on. 3 broken head bolts is what caused it. I've seen loose bolts do it as well. Pull the exhaust screen while your at it. They plug real easy. MS460 is not that old of a saw. I do not have any parts for that saw at present, but I can get anything you need for it. Let me know what prices you can get, and I'll see if I can beat them.
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Old 09-02-2009, 03:43 AM
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Cowboy that looks like a classic case of no oil in the fuel I run my kids 2 stroke bike mix 33-1 in mine even though it is a bit different to what they say. So far so good, but i'm not a lumberjack
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Old 09-02-2009, 08:14 AM
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Quote:
Originally Posted by Freak View Post
Seen a few like this Chase. Actually, one just the other day I worked on. 3 broken head bolts is what caused it. I've seen loose bolts do it as well. Pull the exhaust screen while your at it. They plug real easy. MS460 is not that old of a saw. I do not have any parts for that saw at present, but I can get anything you need for it. Let me know what prices you can get, and I'll see if I can beat them.
Freak- cylinder bolts were all tight. No foreign debris in the muffler (but it could have fallen out when I pulled the muffler). You should keep your eyes open for a wrap handlebar for me... I could use 2 of them actually! If you happen to have any old basket case Stihls laying around the shop I'm all ears...
Pete- the piston was not seized up, the cylinder has no scoring in it, just damage to the head and piston crown from the piston beating the crap out of something for a while. I wish I could have taken a better pic of the piston crown, but it's definitely FOD. At least I was able to steal parts from this one to get my 044 going again.
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Old 09-02-2009, 09:10 AM
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Will do, almost everytime I get a junker, they want it back for parts. I had a 056 mag a few weeks ago. The logging company told me to junk it. I thought, oh boy! I can make a runner out of this on my own time. About a week later I was looking around in the shop for it, asked my buddy where it was, "they came and got it said they wanted it for parts" Oh well ha ha
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