1970 Commando S. A strident noise from gearbox

pierodn · Jul 30, 2019

Hi All.
The bikes has 5000 km done without problems, with engine/gearbox/clutch completely rebuilt.
In the last trip i have heard a strident noise from gearbox (or clutch??) only in the third shift that went away if you pulled the clutch lever.
What i must check?.
Greetings from Italy.
Piero

kommando · Jul 30, 2019

Gearbox and clutch need looking over, check oil levels first then open up if not low.

B+Bogus · Jul 30, 2019

If it was mine, initial focus would be on the clutch nut on the mainshaft followed by the nut on the other end of the mainshaft - if pulling the clutch in changes things it may indicate the clutch is ready to fall off.

bill · Jul 30, 2019

if it only does it in 3rd gear with the clutch engaged than i would be looking inside the gearbox at the 3rd gear pair.

pierodn said:
In the last trip i have heard a strident noise from gearbox (or clutch??) only in the third shift that went away if you pulled the clutch lever.
What i must check?.

pierodn · Aug 1, 2019

bill said:
if it only does it in 3rd gear with the clutch engaged than i would be looking inside the gearbox at the 3rd gear pair.

Or the BUSH-3RD GEAR LAYSHAFT?

bill · Aug 1, 2019

teeth coming off the gears is a known issue along with the tooth face deteriorating.

pierodn · Aug 2, 2019

The question is if is dangerous to ride with this noise and i can wayt the winter to eliminate it!!!

kommando · Aug 2, 2019

No one can answer that, to be 100% you have to find the issue.

DogT · Aug 3, 2019

I wouldn't wait. It's most likely not going to cure itself.

1970 Commando S. A strident noise from gearbox

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