SOHC.co.uk Forums > CB350/400

Primary Drive Chain Guide

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SeanFD:
Yes, there are definitely two.

The one in the top case is relatively easy to locate properly as there is a ridge/boss on the case which means it only fits well one way.

In the bottom casE, however, it will sit equally well either way. The problem is that one end - the end with the “dimple” in it – is effectively longer than the other.

In any case the answer seems to be that the “dimple” goes downwards towards the sump.

SeanFD:
So I noted on Nurse Julie’s thread a comment to the effect that: “The primary chain is the original and is knackered.”

I was wondering how you checked it and so looked up my Haynes manual, and guess what I found! Page 36, para 34.2

              “When fitting guides, the incised dot must be at the rear end of the guide” !

There is even a picture!!  :-[

Anyway it didn’t say how to decide of the chain is done, so Julie can you advise?

Nurse Julie:
Here is my old chain on the left next to the new chain on the right. You can see the old chain has lost a lot of its structure and is sagging. Also, in my mind, there was no point in not changing the chain as I don't plan stripping that engine again and it's a full strip needed to change it, so not prudent or cost effective not changing it during the build. Even if the chain hadn't have been as knackered, I would have changed it anyway.
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SeanFD:
Thanks Julie,

Seeing them side by side it’s pretty obvious. I’ll check mine out tomorrow; on visual inspection it looked OK - nothing bent, worn or chewed And it didn’t stretch – but I didn’t think about it sagging like that.

I agree with what you say about not wanting to do it again soon, but it’s always a dilemma; these bikes can last a long time and take a lot of abuse - I’ve just ridden a 750K2 from Zimbabwe to Ireland – so you either decide to replace everything or only stuff that really and clearly needs it.

I started this project on a tidy up and ride basis, so I’m already way past what I started out to do. That in many ways make the decision even more difficult, but if it needs doing, it needs doing.

Bryanj:
The chain is same as a Kawasaki one which can be bought a lot cheaper

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