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500K2 engine rebuild. Newbie questions

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ebmbiker:
Here's a photo of the marks in the lower case from the primary drive chain. Thoughts?

Cheers, JB [ Guests cannot view attachments ]

Bryanj:
Thats about as bad as it can be, its the groove at the topp right in the angled bit that is the problem.
Will be OK with new chain and damper rubbers.
Rubbers are still available to order from any Honda dealer

Oddjob:
Yep, that's a bad un. Almost through the oil gallery, there are some things you can do.

First replace the chain and damper rubbers, that will stop it rubbing for a good while.

Replace the chain every 30K at least, sooner is better. You can't take a chance anymore as any more damage will mean a new set of crankcases.

Fit a CB650 primary chain tensioner, these can be hard to find but it's a mod worth doing, especially with that damage, you need a special bracket making to fit the tensioner. This is a mod I'm doing on my engine when it's next in pieces, which will be this year sometime. I had 2 of the brackets made as the engineer didn't want to make only one so I had to tempt him with 2. Cost me £50 each but one is spare if you ever go this way.

I'd replace the roller bearings on the primary drive as well, all that alloy flying around is bound to have gone into the bearings and the chain must have really been whipping around to do that much damage and that would have been hard on the bearings, for the cost, replace them.

Bryanj:
Ive always wondered if youcould machine a steel tube to line  that gallery and slide it in

Oddjob:
Not sure Bryan, I was cleaning one the other day and I think it goes round a corner so maybe not.

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