customcutter
Well-Known OPE Member
- Local time
- 4:50 PM
- User ID
- 4323
- Joined
- Oct 11, 2017
- Messages
- 38
- Reaction score
- 76
- Location
- Central Florida
I bought a 570 a couple of weeks ago at the pawn shop. I asked if I could start it up, the guy said sure, so I took it outside and it started right up. I could tell the compression was a little low from pulling on the starter cord. They were asking $230, so I tried to talk them down, told them all the problems the saw had etc. No budge. So I left. I came back 3 hrs later with some tools and asked if I could pull the muffler, guy said sure. so I pulled the muffler, and could see light scoring, on the piston, but not too bad. I told him about that but still no budge. I bought it.
I pulled it apart, and cleaned up the Al transfer on the cylinder. I also tried to clean up the piston by "shoe shining" the section with some 120 then 320 emory tape. I also noticed a few rough spots on the ring so I "rolled" the edge on a hard arkansas stone till I cleaned it up. I wasn't happy with the piston so I got some 220 wet/dry on my pink inspection plate and "rolled/scraped" the piston on it, and then followed with 400 grit. I could feel lumps when rolling it on a hard surface before doing the final procedure.
The piston ring is .-078" on the sides and .o775 in the front. I measured 2 other sets of rings I have for a 365 and a 372 and they measure .079". Should I replace the ring or will I see much improvement?
The squish is .038" and I would like to do a gasket delete but there is a gap of .0035" between the 2 case halves. Thinner gasket material? or no gasket and 1184?
What other easy mods. I saw where Weimedog raised the bottom of the cylinder on a 365 I think .030", but don't remember if it was intake or exhaust side. I think it was exhaust?
thanks,
Ken
I pulled it apart, and cleaned up the Al transfer on the cylinder. I also tried to clean up the piston by "shoe shining" the section with some 120 then 320 emory tape. I also noticed a few rough spots on the ring so I "rolled" the edge on a hard arkansas stone till I cleaned it up. I wasn't happy with the piston so I got some 220 wet/dry on my pink inspection plate and "rolled/scraped" the piston on it, and then followed with 400 grit. I could feel lumps when rolling it on a hard surface before doing the final procedure.
The piston ring is .-078" on the sides and .o775 in the front. I measured 2 other sets of rings I have for a 365 and a 372 and they measure .079". Should I replace the ring or will I see much improvement?
The squish is .038" and I would like to do a gasket delete but there is a gap of .0035" between the 2 case halves. Thinner gasket material? or no gasket and 1184?
What other easy mods. I saw where Weimedog raised the bottom of the cylinder on a 365 I think .030", but don't remember if it was intake or exhaust side. I think it was exhaust?
thanks,
Ken