C72 from France
- sky.fred
- honda305.com Member
- Posts: 76
- Joined: Sun Jan 28, 2024 5:37 am
- Location: Bordeaux France
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Re: C72 from France
Trouble with my C72 during a vintage bike tour in Auvergne.
Stupid, undetectable failure!
The clutch rod oil seal came out of its housing and the oil drained .... into the sealed chain case. I didn't realize it because there was no oil on the engine or on me!

Fortunately, more fear than harm. I don't seem to have any damage other than a piston that tightened.
As I've got some C77 parts, I'm going to upgrade my 250 engine to a 305 CC.
That's a bit of work, as I'll have to change the crankcases and the cylinder head, so I'll have to transfer the parts from one to the other...
Stupid, undetectable failure!
The clutch rod oil seal came out of its housing and the oil drained .... into the sealed chain case. I didn't realize it because there was no oil on the engine or on me!

Fortunately, more fear than harm. I don't seem to have any damage other than a piston that tightened.
As I've got some C77 parts, I'm going to upgrade my 250 engine to a 305 CC.
That's a bit of work, as I'll have to change the crankcases and the cylinder head, so I'll have to transfer the parts from one to the other...
Last edited by sky.fred on Wed Jul 23, 2025 10:04 am, edited 3 times in total.
- sky.fred
- honda305.com Member
- Posts: 76
- Joined: Sun Jan 28, 2024 5:37 am
- Location: Bordeaux France
- Contact:
Re: C72 from France
The motor is almost completely dismantled. Apart from the pistons/cylinders (especially the right-hand one), the rest of the engine has not suffered.

I've got almost all the parts I need to rebuild the engine ... now I just have to find the time.


I've got almost all the parts I need to rebuild the engine ... now I just have to find the time.

Last edited by sky.fred on Wed Jul 23, 2025 10:06 am, edited 2 times in total.