Had my cossie crank ground, after No4 big end knocked out.

The machinest told me it was slightly bent, but could get it true again on a -0.25mm big ends, -0.50mm mains.


But last week i CC checked the piston and bores, and today due to the cc's being out, i checked the stroke of the crank.

No 1 = 77.15mm stroke = 8.33 c/r
No 2 = 76.81mm stroke = 8.16 c/r
No 3 = 76.68mm stroke = 8.13 c/r
No 4 = 77.34mm stroke = 8.52 c/r



I've now got to machine the pistons of 1 and 4 to get the c/r correct.



After a crank grind is this usual, and would the machinest notice this whilist grinding the crank?
As i've never had a crank stroke change after a crank grind before.