What is this cog called?

[Athame57]

Can some kind expert please tell me the proper name for the cog arrowed in the supplied image? The guy at the shop today wasn't the mechanic and he couldn't tell me for sure but my issue seems to be with a second gear item rather than a third as discussed in an earlier thread.

[K2-K6]

Looks like fith gear secondary shaft. That's from my visual assessment of your picture.

Count the teeth on each of them, on that secondary shaft.

Sixth is the lowest number of teeth, first the highest number of teeth (opposite on primary shaft, the one with clutch on it) to let you judge which one you are talking about and identify it conclusively.

[Deano400]

Countershaft Top (6th), the gear to it's right is countershaft 2nd.

[ozzybud]

https://images.cmsnl.com/img/partslists/honda-cb400f-super-sport-400-four-1975-cb400fk0-usa-transmission_bighu0235e7016_5f59.gif

from the exploded view it is #13 23521-377-010
Top gear(6) countershaft

are there visual signs of wear on any of the gear sets?
Check for bent shifting forks

[Athame57]

Thanks for this Ozzy, this is what Steve at 400fourbits just told me and that mostly they have some level of damage on them  It seems I've got a hunt on my hands?

[ozzybud]

What are the symptoms you are experiencing?

Literally it all has to work together like a well oiled Machine. Everything needs to be checked.

Worn pins or the grooves in the shifting drum.Worn or bent forks. Worn dogs and sockets. Sloppy bearings. And wear or other  issues with the shifting arm not engaging things all the way.

[Athame57]

Ozzy, I didn't even know there was an issue with it until it was shown to me, no symptoms. It doesn't really look like much damage and if it is usually the case as I'm told that there is some I just might tell them to ignore it. Even CMSL havn't got the part.

[taysidedragon]

Ozzy, I didn't even know there was an issue with it until it was shown to me, no symptoms. It doesn't really look like much damage and if it is usually the case as I'm told that there is some I just might tell them to ignore it. Even CMSL havn't got the part.

I'd be tempted to put it back then. Can you get pictures of the alleged damage?
After their muckup with the primary chain and not identifying the correct gear I wouldn't trust them.
I hope they don't introduce a problem that wasn't there before! 😕

[Athame57]

I'd be tempted to put it back then. Can you get pictures of the alleged damage?
After their muckup with the primary chain and not identifying the correct gear I wouldn't trust them.
I hope they don't introduce a problem that wasn't there before! 😕

I was thinking too, maybe a bit out of their depth? They did really good work on my electrics and other things before though. At this rate I'm going to have to accept there is some scuffing (see pic) and hope it isn't much to worry about? Heres a bigger pic of the same. See the scuffing?

[ozzybud]

I'd be tempted to put it back then. Can you get pictures of the alleged damage?
After their muckup with the primary chain and not identifying the correct gear I wouldn't trust them.
I hope they don't introduce a problem that wasn't there before! 😕

I was thinking too, maybe a bit out of their depth? They did really good work on my electrics and other things before though. At this rate I'm going to have to accept there is some scuffing (see pic) and hope it isn't much to worry about? Heres a bigger pic of the same. See the scuffing?

Honda gearboxes are very robust! I agree with dragon to just roll with it. If it was working before tear down and it shifted through all gears and didn't kick out of gears i see no problem.

[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]

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.

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! 

[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]

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.

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.