SOHC.co.uk Forums > CB350/400

What is this cog called?

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Laverda Dave:
I can see what you mean now. It does appear as though the gear isn't fully meshing or if it is it isn't properly aligned but, if it wasn't causing a problem before why should it now? With it being an old girl you are not going to thrash it and take it up to 10,000 rpm before sticking it in top on a clutchless change are you.

Athame57:

--- Quote from: Laverda Dave on March 09, 2024, 10:41:49 AM ---I can see what you mean now. It does appear as though the gear isn't fully meshing or if it is it isn't properly aligned but, if it wasn't causing a problem before why should it now? With it being an old girl you are not going to thrash it and take it up to 10,000 rpm before sticking it in top on a clutchless change are you.

--- End quote ---
Never had an issue and no, I don't red line her that is for sure, it isn't just the bike that is getting old!  ;D

Laverda Dave:
Looking at the photo again very closely are those teeth badly worn or has it picked up something to cause those markings? Is there any evidence of anything lying in the gearbox or sump to eliminate any potential cause. I can't see the teeth on the corresponding gear it meshes with to see if that gear has any damage, I assume the mechanic has given that gear a clean bill of health?
The problem with zooming in on a photo is you can see every little mark together with the light playing tricks.

Athame57:

--- Quote from: Laverda Dave on March 09, 2024, 01:04:24 PM ---I can't see the teeth on the corresponding gear it meshes with to see if that gear has any damage, I assume the mechanic has given that gear a clean bill of health?
The problem with zooming in on a photo is you can see every little mark together with the light playing tricks.

--- End quote ---
He only spoke of the one cog and didn't mention debris in the sump.

McCabe-Thiele (Ted):
It might be the lighting, I can see what looks like quite a bit of light surface rust on the gearbox internals - mine was the same as was the gearbox output shaft where the front sprocket sits.

Not sure how quickly the surface rust returns or if there is any real danger of it contaminating the oil and reaching the crank journals - presumably the oil filter should catch that sort of stuff.

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