SOHC.co.uk Forums > CB750

Help! What's caused this?

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Oddjob:
It's a 550 IIRC Graham, those are made of steel I think. Never heard of one snapping yet, must have put one bolt right down and sheared it off. Always do them a little at a time and rotate amongst them.

Bristolbadger:
And there I was, thinking I'll not fall foul of the damn lifter plate tightening this time... only to hear the sickening 'tick' as it snapped. Might have to bite the bullet and go for one of those Trigger  ::)

Oddjob:
It's for  a 750, won't fit yours.

Edit.

Sorry, for some reason I was convinced yours was a 550, no idea why.

Yes that will fit.

Bristolbadger:
Hi folks, so after a few minor hiccups during the strip, clean and rebuild I've managed to get the old girl back together.

Not the quietest engine around and need to reset the tensioner and recheck the valve clearances but she is what she is, a grumbling 48yr old lol.

So, lessons learnt ... I'm going to dump the oil and refill after a bit more running and a gentle mile or so. I first span her over with plugs out and got the oil pump doing its job after a moment or two and heard oil squelching up into the head, then fired her up and took the cover caps off expecting to see a lot of oil flinging around.
Whilst there is some (more of a fine mist) and everything looks wet and nice fresh oil coated, I just wondered if I should be seeing more going on up there?

Here's a vid - soz about the dodgy camerawork I had a torch in one hand, phone in the other and a beer that needed drinking on the ground 

https://youtu.be/22DMBzUvSvE

Sent from my SM-A515F using Tapatalk

K2-K6:
Nice work to get going again.

The oil is not that much (in quantity terms) demanded around the camshaft. Most importantly is always to be there, present and reliable to keep it from damaging itself.

It's why they will run for a few miles after rebuilding originally that the assembly oil is sufficient until it goes dry that shows this. So as long as the supply is constant it won't show much in the way of total amount flying around in there.

They control the feed volume with those two restrictions and the leak down back to sump by the little pools created by casting to dip the cam lobes into, along with the drain holes going back down through the head.

Just keep checking the oil is there for each run initially to give you confidence that it's always there and that should be ok at that.

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