SOHC.co.uk Forums > CB750

Rattling noise when in neutral

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hairygit:
Carb balance is often the cause of rattles at tickover on the Honda fours. Carb balancing needs to be done AFTER all other service items, tappets, camchain, ignition timing etc, with the engine warm and the correct oil level. It will make a big difference when it's been done.

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Colonial-Clive (yindi):
Yep mine sounds like an empty can of bolts at the moment just saving the pennies to take it too
These guys.   http://d-mengineering.co.uk  They can fine tune it, then it's time to put the smiles with the miles on!

Paulreade:
I wonder if we can define the difference between a rattle and a clatter ?, I would describe mine more as a clatter - certainly if the indicated revs are around a 1000. If I up them a little to 1500 it seems to be less noticeable. I actually question the accuracy of the tacho in any case as running it adj my Suzuki 4, even 1500 rpm read, sounds less than 1100rpm on my Suzuki!. I read on the forum that a replacement clutch with one of the plates having a wider tab ?????. Not sure if this means anything to anyone, I assume the wider tab means that the plates won't clatter from side to side as much ?. I guess in the first instance a carb resync is advisable and take it a step at a time. I've set my static timing & cam chain as per the video,does anyone have a decent link to a video or paper on setting the dynamic timing with a strobe ?.

Greebo:

--- Quote from: Colonial-Clive (yindi) on June 13, 2018, 10:23:37 AM ---Yep mine sounds like an empty can of bolts at the moment just saving the pennies to take it too
These guys.   http://d-mengineering.co.uk  They can fine tune it, then it's time to put the smiles with the miles on!

--- End quote ---

Saving pennies to go to D-M Engineering.. :o.. Mate you will need lots & lots of £'s....DM are the best in the business for the sohc engines but very minty !

Paulreade:
I think I'll use them as a last resort. I dived into the classic bike scene expecting and wanting to learn a bit more about them. So far it's quite enjoyable solving the issues. I hope I can progress to changing the clutch toward the end of summer and get the carbs balanced. If it needs more intervention then I might have to rely on someone who knows what's what as I'm sure I don't have the knowledge as yet to strip it down - hopefully it won't come to that.

What I have noticed after doing the static timing and the cam chain adjustment is the bike fires up much better. On tickover it clatters until you pull in the clutch ????? - clutch or primary chain ????. Also when riding in any gear you can hear what I can only describe ( hopefully it's an understood term) the drivetrain working. It's less noticeable say above 3-4 k rpm. I am not sure if this is normal for a bike of this age (k6) or if it's symptomatic of something worn ????. As the k6 is new to me I am on a steep learning curve.

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