This came over my bench a couple months ago. Stalled during idle after 2 cuts and wouldn't restart
No compression - I asked the guy if he put oil in it. He said he put the fuel in there (fuel cap) and the oil in there (pointing to oil cap).
So straight fueled. Was his brothers, who recently moved into a unit and gave him the saw. First day and he stuffed it.
He left it for parts. I pulled it down that afternoon - classic 4 corner seizure, but not severe. Plus a stuck piston ring. Took 180 then 360 grit sand paper to the scores in a criss-cross hone pattern
Washed all out with petrol, cleaned up piston ring and piston, resealed and re-joined the barrel to the case.
Put it all back together, assembled with a new chain I got on Bunnings clearance for $10 (open pack). Fired after 3 pulls but after 2 hours of stuffing around yesterday afternoon, I had all but given up. It has borderline compression and I figured it just wasn’t creating enough vacuum to suck the fuel in properly.
Today (after it sitting overnight with 98ron in the tank), it fired up and I could coax it to keep going. End of a long tuning session saw it idle at min 3500rpm (chain doesn’t engage but max in manual is 3400). Anything below that and it slowly dies. It still does it occasionally if you idle it more than 2 minutes. Have it revving out at 10500 out of cut (12500 spec) as that gave the most power in cut.
Only thing I can fault is it throws out a tonne of bar oil (as you can see by the cardboard). Plus it’s a bit cantankerous to hot start but 2 pulls with the throttle lock engaged seems to get it going. Put a 1/4 of a tank through it doing some pruning, and seems alright
Pretty good considering I gave it a 20% chance a working.
