Top end rebuild

[Hawkeye]

I have a 650 that I plan on boring out to a 706. When I removed the jugs, I noticed that there was some moderate pitting of the sleeve between the top of piston to the top of head. My question would be approximately how thick would the boring be at the completion of the bore operation. And would the pitting be a problem at that location? Thanx!

 

[Jim]

Put up a pic so we can look at it....

 

[TwoManyXS1Bs]

Opening up to a 706cc would be going from a 75mm bore to a 78mm bore, a 3mm increase, which would be done by cutting 1.5mm (0.060", or about 1/16") from the cylinder sleeve walls. That should remove some very serious pitting.

http://www.xs650.com/threads/big-bore-sleeve-wall-thickness.23508/

 

[Hawkeye]

Put up a pic so we can look at it....

I don't see where pictures would do any good. You can't tell pits from these photos