KMWilliamsWoodcraft

Hey bud! i run a chainsaw mill business further north in Mid wales (Llanidloes) its about 1hr40m to pontypool from me, its abit of a stretch but if you're still struggling maybe we can make something work. I charge £350 a day

put up some pictures!

If i am going to tackle this rebuild myself, what do i need to buy in total and replace if im splitting the crankcase and replacing the main bearings? this would be my first time undertaking such a job.

Hey bud, yes both circlips were intact. the intake side of the cylinder was pretty much perfect, the exhaust side had some transfer which i cleaned up. new piston was a nice fit and didnt seem to have any slop.

Ok, ill take the cylinder off tomorrow and check all that. It never seized, it was just low on compression and i thought id repair before it went pop. I think it could have been overheated. the spark plug has a light grey colour and the saw wont idle low like my other one, it either has to be idling high or it dies. thanks for your insights my man! cheers

Yeah the clutch is known but not urgent at the moment. ill upload a video of my other 880 for comparison (ignore the chain break noises thats all fixed now) good ms880.mp4

Yes perhaps your right, thats why i did the gaskets and crank seals, i guess a vacuum pressure test will tell me if theres still a leak. do you mean main bearings? cheers bud!

hey guys, i recently put a new meteor piston kit in my ms880 as the previous piston put in by the PO was a cheap Chinese golf brand and it was scored up and actually had a crack in it...it was running ok however was low on compression hence why i put a new piston in. While i was doing this i also put in two new crank seals, exhaust and base cylinder gasket. Saw is now at 165 PSI compression HOWEVER there's now a strange rumbling noise ive not heard before and it wasn't there before, nor is it present on my other ms880. The saw seems to be running lean and doesn't want to idle if the screw is set low and it cuts out sometimes and bogs out. When it cuts out it can be hard to start again but will fire up easily if the choke is on... prior to the new piston it was actually running pretty well. I didn't remove the carb. In this very poorly taken video you can hear the low rumbling noise and it seems like its coming from the flywheel side. I swapped over the entire clutch side from my other 880 to this one and the noise didn't go away so i can clarify its nothing to do with that side. There is also 0 play in the crankshaft either side, no up down no left right its all tight so im assuming that means the bearings are good? but it sounds like a bearing rumble... Has anyone experienced this before? Im going to try and get a vacuum/pressure tester and test for air leaks as i feel its running lean and then move on to the carb and check the impulse line, does this sound like a good plan of action? cheers everyone! ms880 rumbling noise.mp4 and heres the old piston i pulled out...cylinder wasnt bad at all, came up good after a little scrub up. WhatsApp Video 2025-04-25 at 19.59.07_f0af2ef4.mp4