CONTINUING clutch problems!!!

DianneB · Post by **DianneB** » Mon Sep 19, 2016 5:42 am

I finished the rebuild of my '67 C77 last winter but have had on-going clutch problems.

The original clutch was sticking badly so I took it off, cleaned everything thoroughly, and put in new friction plates.

Then the clutch would slip on hard acceleration, particularly in high gear, so I replaced the springs with heavier springs. Now the clutch is sticking badly again! It is also difficult to pull the clutch lever.

The bike doesn't get used often but when it does, it takes some work and ###ing around to get the clutch to let loose.

Do others have this problem?
Is it the type of oil (10w 30 automotive)?
Did I put in springs that are too heavy?

Other ideas?

rustywrench · Post by **rustywrench** » Mon Sep 19, 2016 9:52 am

Check the oil you used. If it has friction modifiers, change the oil to correct the slipping. If you want to use the multi grade oil, then use a mc oil for wet clutches. Then go back to the stock springs for ease of pull. Rusty

G-Man · Post by **G-Man** » Mon Sep 19, 2016 10:27 am

There is a later clutch assembly which reduces the amount of oil that gets to the plates. Look for a pressure plate with four holes in the pressure plate.

http://www.ebay.com/itm/HONDA-CA-72-77- ... ww&vxp=mtr

This works with a mating centre

http://www.ebay.com/itm/Honda-CB72-CL72 ... 2o&vxp=mtr

Some notes from Honda UK on the later clutch....

G

rustywrench wrote:Check the oil you used. If it has friction modifiers, change the oil to correct the slipping. If you want to use the multi grade oil, then use a mc oil for wet clutches. Then go back to the stock springs for ease of pull. Rusty

revlover · Post by **revlover** » Wed Sep 21, 2016 1:08 am

rustywrench wrote:Check the oil you used. If it has friction modifiers, change the oil to correct the slipping. If you want to use the multi grade oil, then use a mc oil for wet clutches. Then go back to the stock springs for ease of pull. Rusty

Dianne, If your 10w30 bears the words "Energy Conserving"on the label, then friction modifiers are likely present. I had a friend who had a similar clutch problem. He changed his oil...problem solved.

DianneB · Post by **DianneB** » Mon Oct 03, 2016 3:04 pm

My oil didn't say anything like "energy conservation" or "friction modifiers" but I change it out for "motorcycle oil" and changed back to the original clutch springs after washing the clutch plates.

Took it out for a boot today and the clutch didn't appear to be slipping. We will see if it slips on the highway or sticks again.

Billiam · Post by **Billiam** » Fri Feb 03, 2017 2:41 pm

Just read through your projects link. --- Respect -- From the UK.

DianneB · Post by **DianneB** » Wed Mar 29, 2017 8:15 am

After washing the clutch again last fall and switching to a motorcycle oil, the clutch in the Purple Dream is stuck fast again this spring :( Going to have to take it apart (again) and wash it (again).

I am beginning to wonder if the friction plates that I got for it were poor quality?