SOHC.co.uk Forums > CB750

Gearbox whine and clutch rattle

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royhall:
Hi all. Just bought an F2 sohc that's been standing for about 4 years. Wasn't running when I bought it so did not get the chance of a test ride (price was very good so took a chance). Been through it all and it now runs very well, in fact will pull to the redline without missing a beat. Now the problem I could use advice on: the big one is when riding it there is a noticeable whine from the gearbox. Never having owned one before could somebody let me know if this is normal or maybe a gearbox bearing or something. It goes into all the gears really well, up and down the box and finds neutral okay. The other noise is the clutch at tickover. It is very rattly although it is adjusted correctly, and work well. These noises are unnerving and I wonder should I be using the bike as it may be causing damage. Any help would be appreciated. Cheers.

tom400f:
All of these Honda fours will suffer some "rattle" when idling in neutral. How much will depend on how worn the cush rubbers in the clutch are and how well balanced your carbs are. Of itself it's not much to worry about but hard to say as it's all down to degree.

They do whine as well, (well mine is a 400 and it certainly does). You don't say which gear so I assume all of them (mine is loudest in 2nd, especially on the overrun).

If you say what work you have done, mileage and so on, there would be more to go on.

royhall:
Thanks for the reply. Done the full thing on the bike ie. carb clean and rebuild (full apart and ultrasonic), oil change and filter, air filter and new filter trumpets, new plugs/points/condensers, set the tappets, checked and set cam chain tensioner, strobed the ignition/checked advance, balanced the carbs/set slow running mixtures with shop tacho, and many more check and repairs. Mileage is about 29000 miles. The whine is in all gears, but more noticeable in first and second. Not too worried about the clutch just yet as I haven't pulled it out for a check over, will try to do that next weekend. The bike is an F2 and I suspect it may have K series plates in it. If it has could be an easy fix will see at weekend. Much more concerned about the gearbox thing though as that could be an engine strip jobby. Not what you want just coming into summer. Cheers.

Green1:
Totally agree with Tom my 750k1 is incredibly rattly from cold everyone that is new to these worries about the clutch rattle
and the cam chain sounds like its chewing the head even when adjusted properly.
If theirs nothing in the old oil don't worry about it. 

Mick

UK Pete:
All sounds like the usual sohc noises, i dont think you have much to worry about
pete

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