Crankcase - bearing housing measurements

[conbs]

As usual, you can be trusted to give the answer that is correct.

[LOUD MOUSE]

What got me is that it was a DREAM crank/bearing and no others apearantly.
If I get bored I'll measure my 360 crank bearings. ..............lm

As usual, you can be trusted to give the answer that is correct.

[conbs]

When did CB production start? If it was after the end of the early Dream production with the larger bearing, that would explain it.

[LOUD MOUSE]

Who's to know???????????????????...................lm

When did CB production start? If it was after the end of the early Dream production with the larger bearing, that would explain it.

[Tim Miller]

I have both bearing offered in parts book NOS in Honda box. C722901A is 75mm O.D & C722901B is the STD. 77mm O.D bearing Honda offered. I have #535 cb72 it also has the standard 77mm O.D bearing. The 75mm bearing is offered in CB72 parts book but it must have been for very early cases.

If cases are out of spec. I would machine a sleeve spacer to accommodate the 75mm bearing to whatever the 77mm case bore was. Or try a different lower case.

Tim

[jensey]

Hi,

That's correct, I have a set of 1960 cases (CB72) with the 75 mm bearing set-up.

But I am not sure if it a true CB72 case, it could also be a newly bought set of cases without numbers (in 1960) that are re-stamped with a CB72 number. The case numbers are odd, and are not "fitting in" the Honda numbering ranges.

The rest of the engine is definitely CB72, it also has the rotating shifting set-up (of course the first gear is completely destroyed).

Jensen