Hello Everyone,
I rebuilt this saw a couple years ago and it has been working great until this past weekend, I was cutting some wood and when I stopped to refuel it wouldn't start. I figured it must have vapor locked because it was so hot out so I let it sit for a while and it still wouldn't start. The next day I tried it again and still couldn't get it going so I pulled the muffler off and saw that a chunk of the piston was gone. Last night I pulled the cylinder off and this is what I found. It appears that it has been running for a while with piston broken. When I took it apart I could not find any pieces of the piston or ring.
I would have never thought it had anything wrong with it because it was running fine until I shut it off to refuel, there was no evidence that the spark plug had been hit by any shrapnel either.
When I rebuilt it I used an aftermarket piston and cylinder, Camber rings, new crank seals, I believe OEM circlips. When I got the new cylinder it was not finished the best so I smoothed the ports as best I could. I have only used 100LL gas at 40:1.
There is a new Golf piston on Ebay right now, would that be better than the other Chinese pistons available?
I am just wondering if anyone can shed some light on what happened.
I rebuilt this saw a couple years ago and it has been working great until this past weekend, I was cutting some wood and when I stopped to refuel it wouldn't start. I figured it must have vapor locked because it was so hot out so I let it sit for a while and it still wouldn't start. The next day I tried it again and still couldn't get it going so I pulled the muffler off and saw that a chunk of the piston was gone. Last night I pulled the cylinder off and this is what I found. It appears that it has been running for a while with piston broken. When I took it apart I could not find any pieces of the piston or ring.
I would have never thought it had anything wrong with it because it was running fine until I shut it off to refuel, there was no evidence that the spark plug had been hit by any shrapnel either.
When I rebuilt it I used an aftermarket piston and cylinder, Camber rings, new crank seals, I believe OEM circlips. When I got the new cylinder it was not finished the best so I smoothed the ports as best I could. I have only used 100LL gas at 40:1.
There is a new Golf piston on Ebay right now, would that be better than the other Chinese pistons available?
I am just wondering if anyone can shed some light on what happened.