SOHC.co.uk Forums > CB350/400
Why do we adjust camchain tension
Nurse Julie:
We have never noticed any slack on any of the 350/400 cam chains on engines built (after fitting everything new). A minute bit of sideway movement of the chain on the sprocket but no movement horizontally of the chain on the sprocket, ie, no play at all once adjusted.
taysidedragon:
If the cam cover is off then the cam and camchain gearwheel are not held securely in position. That shouldn't affect camchain tension because the cam is held down by by the chain itself, but the engine was designed to have the tension set when fully assembled and running.
If all the components are serviceable a bit of camchain noise shouldn't be a problem. If it's too noisy I would suggest there is a problem with worn tensioner blades perhaps, or weak springs on the tensioner rod?
marroinia:
I did your method as well Bryanj, without better result in my case. But I agree when you push the kick you give tension on the front side, the rear slacken and tensioner push further in, that make sense, but not on my bike.
When I removed the 2 bolts [19] it lift [5] up around 2 mm like said Billywingnut, I understand we need a bit of play especially when cold but I have no tension at all in my chain. The cam sprocket have angle play, giving to my opinion the erratic idle, knocking noise and random stall until engine shuts down.
The way i did tension by hand gives just a little slack in the chain and doesn't allow the cam sprocket to move around, I will give start today and see if everything sounds better.
taysidedragon:
The cam sprocket is fixed to the camshaft and shouldn't have any play or sideways movement. You need to check why it is moving.
marroinia:
taysidedragon, yep the cam is moving angle as well, its fixed to the sprocket but like you said the headcover is supposed to be in place and engine warm...
I think I'm going to buy that special bolt that pushes on the tensioner rod and adjust by ear. I had the chain noise on all the rpm range after I tried to adjust in normal condition.
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