SOHC.co.uk Forums > CB750

Rattling noise when in neutral

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hairygit:
The noise will quieten greatly when the carbs are balanced, the noise is caused most of the time by the carbs being out of sync, so it idles uevevenly, causing the clutch/primary chains to clatter/rattle. If the noise almost vanishes pulling the clutch in, 99% of the time it's carb balance issues.

Paulreade:
Thanks for that, carb balance next on the list after a quick check of other service issues.

Trigger:

--- Quote from: Greebo on June 13, 2018, 02:58:32 PM ---
--- 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 !

--- End quote ---

Would not say they are the best in the business but, someone has to pay for all their advertising and trade stands  ;D ;D

royhall:

--- Quote from: Trigger on June 13, 2018, 07:42:45 PM ---
--- Quote from: Greebo on June 13, 2018, 02:58:32 PM ---
--- 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 !

--- End quote ---

Would not say they are the best in the business but, someone has to pay for all their advertising and trade stands  ;D ;D

--- End quote ---
Who is the best in the business then Trig?  ;)

Greebo:

--- Quote from: Paulreade on June 13, 2018, 06:41:01 PM ---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.

--- End quote ---

On both your bikes [yours & el-burro's] It does sound like its the clutch, which rattles a bit normally until you pull it in, & perhaps as others have said if the carbs are out of sync that's making it sound worse ...but don't expect this bike to be smooth & silent like a gold watch, they are not the quietest of engines even when totally rebuilt, but should not be noisy.
...I set my idle speed at 1100rpm & it will sit there nice & steady when warmed-up & I do get a little bit of clutch noise until I pull it in.
my bikes engine has done 2600 miles since rebuild & I have not had to have the carbs balanced again yet.

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