Hi all - apologies in advance for the long post, trying to outline everything needed with all information to get some solid answers.
picked up a not-running 066 (for too much - wanted a bigger saw to play round with and got excited...), previous owner took off exhaust to show me piston scoring etc, my thoughts at the time were that it was lean fueled or just rebuilt dodgily and could strip down and try again.
The only other info I had with the sale was that it had the 'upgraded' poly flywheel and M10 (flywheel side) crank and (yes I know, I know....) I didn't do enough research before buying it. I did look into the poly flywheel and better ignition etc. so thought I was a good idea it had been done.
I have since learned by reading on here that the larger crank cannot interchange into an older 066 due to the oil seal size change and overall width of crankcase. Please correct me if I've found a few posts that are not 100% fact?
I have now stripped it down trying to figure out what happened and have also been looking around this site and others trying to get more info on what bits this saw actually has in it. It has had a fair amount of metal flying around inside, crankcase is gouged (reasonably minor I think), rod has minor dent, cylinder is buggered (scored and intake/exhaust and ports all have been picked up by piston), plus dents all over the top as per photos, and piston itself is worn down on intake side from memory - you'll see on the photos below it's actually lost it's arris/bevel off one side of the piston!
At this point if I knew all parts were correct I would take the damage as a combination of lean fuel (bearings and crank are slightly blue - may well just be from the factory like that?) and more likely a dirty rebuild/exhaust carbon starting a chain reaction of destruction, with the operator not noticing the signs. the piston wear so severe on one side would still concern me though?
The problem I have is from what I read here and elsewhere the serial number on the crankcase is pre - upgraded crank spec 127 506 317 as per photo below, however I can definitely confirm that the crank itself has an M10 thread on the flywheel side (plus the flywheel is most definitely plastic!)
I've also measured the oil seal and it's 22mm od and 15mm id indicating that the case is actually the later version.
so... what do I have here? i'm thinking it's a bitsa? I am of 2 thought trains here:
1 - it's had the larger crankcase/crank upgrade and just a bad job of it
2 - it's had half a crankcase added to the existing other half (to suit oil seal) and stuck together. Is this even possible? and would this explain the entire thing destructing? I've read the cases are not as wide so thinking that a half/half scenario would maybe explain this.
I've taken photos of everything as below, if anyone can help out with identifying exactly what parts I've got here it would be greatly appreciated - would love to order some bits in and rebuild but want to make sure what I've got is compatible first.
thanks in advance - I can get more info/photos if needed.
Sam
picked up a not-running 066 (for too much - wanted a bigger saw to play round with and got excited...), previous owner took off exhaust to show me piston scoring etc, my thoughts at the time were that it was lean fueled or just rebuilt dodgily and could strip down and try again.
The only other info I had with the sale was that it had the 'upgraded' poly flywheel and M10 (flywheel side) crank and (yes I know, I know....) I didn't do enough research before buying it. I did look into the poly flywheel and better ignition etc. so thought I was a good idea it had been done.
I have since learned by reading on here that the larger crank cannot interchange into an older 066 due to the oil seal size change and overall width of crankcase. Please correct me if I've found a few posts that are not 100% fact?
I have now stripped it down trying to figure out what happened and have also been looking around this site and others trying to get more info on what bits this saw actually has in it. It has had a fair amount of metal flying around inside, crankcase is gouged (reasonably minor I think), rod has minor dent, cylinder is buggered (scored and intake/exhaust and ports all have been picked up by piston), plus dents all over the top as per photos, and piston itself is worn down on intake side from memory - you'll see on the photos below it's actually lost it's arris/bevel off one side of the piston!
At this point if I knew all parts were correct I would take the damage as a combination of lean fuel (bearings and crank are slightly blue - may well just be from the factory like that?) and more likely a dirty rebuild/exhaust carbon starting a chain reaction of destruction, with the operator not noticing the signs. the piston wear so severe on one side would still concern me though?
The problem I have is from what I read here and elsewhere the serial number on the crankcase is pre - upgraded crank spec 127 506 317 as per photo below, however I can definitely confirm that the crank itself has an M10 thread on the flywheel side (plus the flywheel is most definitely plastic!)
I've also measured the oil seal and it's 22mm od and 15mm id indicating that the case is actually the later version.
so... what do I have here? i'm thinking it's a bitsa? I am of 2 thought trains here:
1 - it's had the larger crankcase/crank upgrade and just a bad job of it
2 - it's had half a crankcase added to the existing other half (to suit oil seal) and stuck together. Is this even possible? and would this explain the entire thing destructing? I've read the cases are not as wide so thinking that a half/half scenario would maybe explain this.
I've taken photos of everything as below, if anyone can help out with identifying exactly what parts I've got here it would be greatly appreciated - would love to order some bits in and rebuild but want to make sure what I've got is compatible first.
thanks in advance - I can get more info/photos if needed.
Sam
