Bits in the transmission

[Ozzibiker]

I started to hear a faint whining sound, like gears meshing, sometimes when slowing to stop.
I'm not sure if it's related, but recently I changed the belt and rear tyre, and so removed the clutch assembly, drive face, rear wheel (and removed and cleaned the rear brake).

I decided to do the transmission oil ( which has probably never been done. 15,000 km. Ouch!)
A few metal specks and a silvery dust in the oil.

Anyway, the drain bolt wouldn't go in so I stuck a magnet in the hole and pulled out these.

Bits.jpg (91.46 KiB) Viewed 3373 times

I can't see them in the parts manual. Seem to be a clamp for a bearing or similar. Do they look familiar to anyone.

I'll see how the sound progresses. I may be getting myself a new drive set in the future.

[Jge64]

If I had pulled stuff like that out of my rear end oil, I wouldn’t be driving it anywhere. I get it towed to the nearest Honda dealer have them check it out. Or, if you have the expertise , it’s time to tear down that rear cavity.

[Ozzibiker]

Thanks,
I'll be opening it up and replacing the bearings. I'll look at changing the drive gears to a fast ratio also.

[springer1]

Be sure to tell the shop about the drain bolt not wanting to thread back in. It looks like it COULD be threads from the casing the drain & fill plugs thread into - like someone overtightened it and stripped the threads (some of which then galled into the bolt threads which is why it doesn't want to screw back in) and some ended up inside with the gears. Not for sure, but check the threads of the drain & fill plugs to see if there's more pieces there.

[Ozzibiker]

Be sure to tell the shop about the drain bolt not wanting to thread back in. It looks like it COULD be threads from the casing the drain & fill plugs thread into - like someone overtightened it and stripped the threads (some of which then galled into the bolt threads which is why it doesn't want to screw back in) and some ended up inside with the gears. Not for sure, but check the threads of the drain & fill plugs to see if there's more pieces there.

Thanks for your reply.
The bolt didn't go in because those parts above where blocking the hole.
I've opened up the transmission. The bolt and threads are fine. I'll replace the bearings and will order a new Yamanashi high speed gear set for the future.

[Ozzibiker]

This happened a while ago, but I'll update it.
The bits were parts of one of the main bearings in the transmission case (gearbox).
It was a bit of work to get the bearing out, but I replaced it. Problem solved.
It's been running well for more than 15,000km.

[QuantumNomad]

Pulled silver dust and specs from your transmission? If I found stuff like that, I wouldn't be riding at all until I got it checked. Looks kinda like bearing pieces or something. You might wanna get that to a mechanic, unless you can trust yourself to take a look at the internals. Just my thoughts.

[Conelite]

Pulled silver dust and specs from your transmission? If I found stuff like that, I wouldn't be riding at all until I got it checked. Looks kinda like bearing pieces or something. You might wanna get that to a mechanic, unless you can trust yourself to take a look at the internals. Just my thoughts.

These transmission gear cases are super easy to disassemble. Hardest part is getting the wheel nut off without an impact. Just rent a bearing puller from Harbor Freight and return it after you are done. lol

This happened a while ago, but I'll update it.
The bits were parts of one of the main bearings in the transmission case (gearbox).
It was a bit of work to get the bearing out, but I replaced it. Problem solved.
It's been running well for more than 15,000km.

I have gone thru 2 driveshaft bearings in 1 year. Estimated 6k miles.

Bearing #10

Screenshot_20241003_095713_Gallery.jpg (196.74 KiB) Viewed 1380 times

[Ozzibiker]

I have gone thru 2 driveshaft bearings in 1 year. Estimated 6k miles.

Bearing #10

Screenshot_20241003_095713_Gallery.jpg

That's the bearing that failed on me.
Mine was really hard to get out. I tried a bearing puller, but it kept slipping out. In the end had to weld a steel rod to the old bearing to pull it out.
I can't believe you've been through 2 bearings. There must be a problem somewhere? A misalignment or similar?

[Conelite]

That's the bearing that failed on me.
Mine was really hard to get out. I tried a bearing puller, but it kept slipping out. In the end had to weld a steel rod to the old bearing to pull it out.
I can't believe you've been through 2 bearings. There must be a problem somewhere? A misalignment or similar?

The only thing that I can think of at least in my bike situation would be, I did lighten my clutch shoes some. The idea for this would be to decrease the mass of each shoe to raise clutch engagement RPM (Shaved 3 grams total). My idea is they were not exactly each mass causing some extra vibration causing the additional strain on the bearing. I will be replacing my clutch shoes before I ride again.