Can a CA 77 cylinder be swapped out for a CB 77 cylinder

big-b · Post by **big-b** » Mon Mar 14, 2011 9:36 pm

I'm wondering if a CB 77 cylinder can be replaced with a CA 77 cylinder?

Brian

48lesco · Post by **48lesco** » Tue Mar 15, 2011 9:30 am

Yes but... There are three variations on that cylinder block ending in part numbers -000, -010, and -020. -000 has a different oil gallery setup and the base gasket has an elongated hole. -020 has a skinnier cam chain tensioner. Just make sure you use the right one for your bike. CA, CB, and CL77's all use the same blocks. Half a dozen on ebay at any given time.

big-b · Post by **big-b** » Tue Mar 15, 2011 9:55 am

I was hoping to use all my CB parts but replace the cylinder, pistons and rings with those from a CA. I guess i'll have to take a better look when i get the parts.

Brian

cyclon36 · Post by **cyclon36** » Tue Mar 15, 2011 10:03 am

big-b wrote:I was hoping to use all my CB parts but replace the cylinder, pistons and rings with those from a CA. I guess i'll have to take a better look when i get the parts.

Brian

If you keep the top end as a CB but just replace the pistons with CA pistons, you'll get a bit more compression.

big-b · Post by **big-b** » Tue Mar 15, 2011 10:17 am

Here's what my issue has become. I have a CB 77 the motor was stuck, i pulled it all apart and brought it to a well known motorcycle engine guy in my area. The pistons and rings both need to be replaced and it needs to be bored 1 over. The work was going to be pretty expensive and then on top of the labor i would have to buy new pistons and rings 1 size over.

I took a chance and bought a good CA 77 cylinder including pistons and rings and i'm hoping i can swap that in place of the CB stuff. I guess i will have to do a little measuring and hope for a little luck as well. If it doesn't work then it will be a fairly inexpensive lesson learned.

Brian

joeweir1 · Post by **joeweir1** » Tue Mar 15, 2011 8:32 pm

Any reason you just can't pop the sleeves out and swap them?

big-b · Post by **big-b** » Tue Mar 15, 2011 9:14 pm

That might be an option.

Brian