frogman
'74 CB360, '71 CB450, '75 CB550SS
Re: My 1974 CB360 project
If you re-ring a used cylinder then once you hone out the glaze you will remove SOME of the metal in the bore. Your pistons will expand somewhat as they heat up so they will sorta fill the gap but the stock rings will likely not fit within tolerance. .25 over rings for a slightly used bore will let you hand fit them so they are in spec with the manual and give you as much compression as possible. Plus they are meant for slightly bigger bores so they have just a hair more spring in them and will push just a bit more against the cylinder walls.
.25 over is barely noticeable and can be hand fit with a good hand file and some patience in a slightly used standard bore. You should check the end gaps on the original rings before you order the next set. If you have to bore things out then you go with the new bore size.
All this talk is killing me I'm a coat of paint from getting things back together and running. Well the frame needs a coat, the tins are still waiting for my hammer love.
If you re-ring a used cylinder then once you hone out the glaze you will remove SOME of the metal in the bore. Your pistons will expand somewhat as they heat up so they will sorta fill the gap but the stock rings will likely not fit within tolerance. .25 over rings for a slightly used bore will let you hand fit them so they are in spec with the manual and give you as much compression as possible. Plus they are meant for slightly bigger bores so they have just a hair more spring in them and will push just a bit more against the cylinder walls.
.25 over is barely noticeable and can be hand fit with a good hand file and some patience in a slightly used standard bore. You should check the end gaps on the original rings before you order the next set. If you have to bore things out then you go with the new bore size.
All this talk is killing me I'm a coat of paint from getting things back together and running. Well the frame needs a coat, the tins are still waiting for my hammer love.