You've added nothing of value to Fernando's inquiry, Mr Zuniga
650's and 750's were 82mm stroke. And stroke IS crank related.
The change from inch to metric timing side bearings happened in 71. On 650's.
A change in bearing clearance for 750's happened around 76.
I take issue with your initial response because I (and others) have a lot of time invested in helping Fernando have a successful outcome with his T140. You spouting nonsense will do nothing to achieve that end.
"Better to remain silent and be thought a fool than to speak and remove all doubt"