Piston sizes

[jimyboyle]

While in the middle of my 2 door restoration, I bought a 1275 midget engine to fit in place of my 1098.

The internals look quite good, big ends have been ground to -.010" and the bores show almost no wear however,
the pistons are clearly marked 0.75 suggesting 75 thou rebore.

When I measure the bores I get about 71.4mm (metric mike) which is 0.030"over standard

Would piston have been incorrectly marked? seems hard to believe.

Jim

[katy]

I don't know if it means anything, but .75mm = .0295275"

[jimyboyle]

Well spotted Katy, it never crossed my mind that they could have marked the piston with a metric unit
Jim