SOHC.co.uk Forums > CB750

Normal?

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Waggles:
My F1 is bedding down nicely now and is pretty much as I remember the one I had new in '76, but for one thing, I get quite a buzz of vibration through the bars from around 50 mph onwards. Now it could be selective memory but I do remember the bad as well as the good ( like the gearbox that feels like pushing a knife through a bag of marbles at low revs  :) ) The vibration was enough to make my hands numb after 100 miles if I gripped the bars tightly.

Before I go through the tuning and checking of engine mounts etc is this normal and I have just forgotten? I don't remember feeling the need to rubber mount the bars on my original one!

Spitfire:
I don't remember it as that bad but I did have to rubber mount my wing mirrors when I bought the bike in 76, these were removed when I rebuilt the bike but have since been reinstated !

Cheers

Den

ST1100:

--- Quote from: Waggles on October 11, 2012, 11:01:29 AM ---The vibration was enough to make my hands numb after 100 miles if I gripped the bars tightly.
--- End quote ---

Are the carbs properly synced?

K2-K6:
Try checking the valve clearances to make sure nothing has got tighter.

Also the ignition advance when running at max advance for both coils and not just look at one.

Check that the compression levels are within range for all cylinders.

Waggles:
So the general concensus is it shouldn't be like that?

The carbs were synced about 1500 miles ago also the ignition timing etc didn't check compression over and above all cylinders have good compression by feel

Probably about time to service completely again as I expect things will have settled. Seems to run fine though

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