SOHC.co.uk Forums > CB350/400

Cam tensioner fitted wrongly?

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Orcade-Ian:
Hi Drew,
If you refer to my much earlier reply, it would appear that you have come to the correct point, in that the blade does indeed stick up.  As I said, I don't have the exact measurement as I don't have an engine at that stage at the moment.  I ALWAYS use Honda bits (as long as they are available) but I use a wooden dowel to compress the blade via the top bracket, so that I don't put unnecessary axial load on the fairly small threads - the bolts are OK, but they are into the much softer alloy casting.  The other thing I didn't say was that I also overhaul the pivoting tensioner arm if it's been damaged/jammed by a flapping chain (I wrote an article for VJMC TANSHA on doing that)
I know you had to part the crankcases apart again after missing that starter gear lockwasher so you are now very familiar with the set up.
You will now know that the front of the chain will always be in tension as the crank drags the camshaft around, but the rear will have a correctly tensioned curve in it, produced by the bend in the blade, assisted by the 2 concentric springs - it's a good enough system, as long as maintenence is carried out correctly and after you have spent all of this time and money, I'm sure you will continue to look after it.  I will measure my next engine, which is nearing completion with all genuine parts - to act as a reference.

Drew400:
Nice one Orcadian,

Yes indeed it's all coming back. What I admit I'm rubbish at is remembering where I read all this stuff and who from!

I think that my learning on bike building is partly based on years of general experience whereas my learning about forum usage is entirely down to this site over recent months! Hopefully readers will see past any failure on my part to acknowledge sources or link to previous discussions, etc.

Cheers,

D.

Lynx:
The strange thing is the top of my cam chain blade is about 10mm below the top of the head. I'm sure the bottom end is located properly. Cam and oil pipes in now anyway. I slackened off the tensioner lock bolt and saw the chain ping taughter. So appears to be working OK. I'll test it before I sell it anyway.

Cheers.

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