1980 GS850G trans or shaft hum

[Moarpower]

Very large wear patches on the drive gear

[tom203]

This gear assembly is precision finished ground as a set to ensure same grinding wheel profile on both gears. Then some lucky guy gets to pick shims and choose which way to orient output housing to achieve quiet/smooth fit up. I’d try to get another set and aim for a little slop at fit-up…it ain’t easy!

[Moarpower]

Just an update. I noted the gears on the existing part and replacement were slightly different. I reinstalled using the replacement gear, torqued it down to spec and the whine and moan is gone completely.

[Moarpower]

You can see the difference gears here in the ultra sonic. Curious as to the application of each and reason for the difference

[salty_monk]

Possibly one leads to a stronger tooth to cope with the power of the later 1000G / 1100G or even the 1400 Intruder which used the same output I think.