CA 77 top CA 72 bottom

[joeweir1]

This same topic was discusssed a week or two ago when someone in Australia got a CA72 and was deciding what to do and if he could convert it. I think loudmouse mentioned potential problems encountered ,such as the machine work.

[bill440cars]

Pigeonalley & joeweir1,

I checked LOUDMOUSE's reponse and PM'd him for more info
on this situation and hopefully we'll get a response that will shed some
light on this. In th meantime I noticed that,somehow, I've put in 2 posts
that are almost identical. How do I remove the 1st one? Anybody?

Later on, Bill

[bill440cars]

Okay, I just got a message from LOUDMOUSE and the head
change will work. The combustion chamber is larger. The cylinders
will fit with the top of the crankcase machined out but, the CA72
crankshaft isn't balanced for the 77 top end.

Pigeonalley, You might be able to swap out the crankshaft also,
I don't know, I didn't think to ask that. Either you could PM
LOUDMOUSE about that or I could. Whatever you want to do. This
could get quite involved but, if the crankshft can be swapped out, the
cost you would be out would be mainly the machining of the top 1/2
of the case, gaskets and maybe rings. What do you think?
Later on, Bill

[cbxmountainman]

Years ago while stationed in Japan, I made a 305 out of a 250. Had to hog out the cases for the liners to fit down into. I'm sure the bare cases can be swapped out and use all your innards from the CB/CL77s. Can see no reason why not.