SOHC.co.uk Forums > CB750
Oil, oil pumps and primary chains
K2-K6:
Looking at the tensioner "strategy" I feel that the spring rate applied can only really try to keep the chain reasonably quiet and stop undue stress from any uncontrolled flapping about, it's not very sophisticated else it would probably be damped as well.
If you think of the drive chain under load then with the tension run pulling the clutch basket all the slack will be roughly held in-check by the tensioner but nothing more.
If you then look at the chain under reverse load i.e. rolling along the road with the rear wheel turning the crank then all the slack will probably be on the opposite run with the tensioner pushed as far out as possible (200-300kg of bike and rider is easily going to push that spring rate) so it then has little or no effect anyway.
I don't see how we can argue with the original Honda design on this one unless you are particulary well informed on drive train analysis, so would choose to leave it as stock if no defects are present.
K2-K6:
On the oil issue. I've no experience of any synthetic in these motors so have no means of commenting on that one.
To me though any oil diluted with petrol is almost certain to be out performed by most new oils so whatever you put in now should help protect it better. If you change your mind then just switch it it's not going to be a disaster.
Graeme77:
Well, it now has halfords semi synthetic 10/40 in it.
Gearbox seems to go into neutral better now too.
Ill measure the oil pressure when i get it running better.
K2-K6:
It seems that the argument against car and synthetic oils in these is primarily the clutch slip potential, and if that is all there is then I'd consider it worth a test to judge it for yourself.
All the other properties of the oil you've put in are surely what you'd want to achieve so plain logic would go for it rather than against. Again it's not going to cost much if you decide against it, if a clutch problem is evident then stop and think again.
Graeme77:
Its motorcycle oil, and should be ok for wet clutches, so im not expecting problems.
Might experiment next time though.
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