STIHL 034 AV rebuild... How far do I go?

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MiloFrance

ArboristSite Member
Joined
Nov 7, 2016
Messages
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Location
France
Hey folks it's been an awfully long time since I was here. Mostly because my work changed and I was no longer waving chainsaws around on an almost daily basis. I now have a full-time job at a very beautiful Chateau in the south of France, but anyway on with the question:
Way back in the you suck thread of 2021 I got hold of a couple of saws at a good price. As the title says I am now looking at the 034.
It's issue was that although it would run fine and idle it lacked power, so looking a bit further the piston and cylinder were quite badly scored.
I've now got the service kit for it but was under the impression that on this model you couldn't change just the piston and cylinder you have to split the crankcase to get even that done.
It now looks to me like I could just change the piston and cylinder and give it a good clean... See photos.
The question is in your much more experienced opinions than mine, is the low power purely going to be due to the scoring? I get the feeling that the seals and bearings are okay although on the big end there is a very very small amount of wiggle. So is it actually worth splitting the crankcase on a saw this old that in all probability will just need the piston and cylinder changing or sell I just do the minimum to get it clean and probably running well again? I've never done a crankshaft and bearings on anything hence my hesitancy and quite a lot of reluctance!20250301_102601.jpg
20250301_131353.jpg
 

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