Topic: Bore measurement question

[KirkBurner]

Could be an inacurate boregauge or the other tool is inacurate or both..

My CB750 is bored to accomodate the POPy 812 pistons, According to Satanic Mechanic this is a 64mm bore.

When I measure it at the top of the cylinder I get 63,9
the pistons measures 63,58.

But when I control measure my BoreGauge thats adjusted to 64mm it measures 65,09

I get a consistant measure from the dial on the bore gauge of one turn and 9

How do I go about to measure if I need to replace my pistons rings or not?
( I dont want to go get new tools at the moment)

[Old Scrambler]

A good bore is slightly tight at the top. Hopefully each piston is matched to a certain hole. The critical clearance is from the top-ring to the bottom of the piston skirt. Also check the ring gaps at their highest level in the cylinder..........just to make sure they are not too tight..........as in closed.

[KirkBurner]

The thing is I am Reading in Hondamans book and trying to compare...

and when my Tools don't line up.. Well then I try the Mathematical approach With 3 unknowns...

Just frustrated any tips on getting the measurements right are appreciated