stephenson
ArboristSite Lurker
So - second time rebuild - still doing it for a friend and it jacks me up that I am doing it again! Figured must have done something wrong - duh.
Same issue as first time - rings welded into the pistons lands and heavy scoring on the piston. First time there was some scoring on the cylinder wall aligned with the exhaust port - I could catch my fingernail on it so not sure if that is considered heavy or light or somewhere in between - in any case, I smoothed it out quite a bit with sandpaper and then completed the remainder of the rebuild with new piston, rings, etc.
I was quite proud of helping my buddy out, and he hadn't said anything so I asked about it a couple of months ago and he said it had stopped working again ... I took a look - looked same as the first time.
I asked all the usual questions about oil ration, etc - I checked gas - looked fine and he clearly knew what he was mixing and the ratios.
So ... here are a couple of photos - would appreciate any advice at this point - this is way simple engine with little to go wrong ... could this all have been caused by being lean? I didn't mess with the carb when I put it back together ... is the cylinder salvageable? I am assuming these cylinders are coated with something like nikasil - can I sand it down again? I know I am pushing it out of round, but short of replacing cylinder, are there any other options?
ebay has an engine for $100 - clearly easy to replace engine, but I hate to give up on something so simple ...
Thanks in advance!!!
Same issue as first time - rings welded into the pistons lands and heavy scoring on the piston. First time there was some scoring on the cylinder wall aligned with the exhaust port - I could catch my fingernail on it so not sure if that is considered heavy or light or somewhere in between - in any case, I smoothed it out quite a bit with sandpaper and then completed the remainder of the rebuild with new piston, rings, etc.
I was quite proud of helping my buddy out, and he hadn't said anything so I asked about it a couple of months ago and he said it had stopped working again ... I took a look - looked same as the first time.
I asked all the usual questions about oil ration, etc - I checked gas - looked fine and he clearly knew what he was mixing and the ratios.
So ... here are a couple of photos - would appreciate any advice at this point - this is way simple engine with little to go wrong ... could this all have been caused by being lean? I didn't mess with the carb when I put it back together ... is the cylinder salvageable? I am assuming these cylinders are coated with something like nikasil - can I sand it down again? I know I am pushing it out of round, but short of replacing cylinder, are there any other options?
ebay has an engine for $100 - clearly easy to replace engine, but I hate to give up on something so simple ...
Thanks in advance!!!