upper and lower cranckcase different engines together? (GS750)

[Martin71RS]

Is it possible to use the upper cranckcase half of 1 engine and the lower of another on a GS750?

I have 1 engine pulled apart and the other is still in my bike so I cannot check it yet.....just wandering if anyone has done this before ?

[TonyGee]

the cases are a matched pair so should stay together, but  I bet someone has done it 

[Fazz711]

It's case of you should not but needs must you can try it. 

You may get lucky 

[Gixer1460]

As said - its not recommended, cases are bored for bearings as a matching set, but cranks and other shafts having roller / ball bearings, are a little more tolerant so may be ok with mismatched halves! If it was a shell bearing engine, its really a no-no without line boring and using oversize shells!

[Martin71RS]

Thanks G I x e r,  that was actually my thought..   that it might be possible because of the ball bearings

I guess I'll do some measuring when I take the other one apart. 

Edited September 20, 2022 by Martin71RS