Brooking 850
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- Joined
- Oct 3, 2011
- Messages
- 1,614

Hi all, I had some issues with my race bike clutch initially and always thought it was because I was making a bit more power than the standard Commando motor.(My Roadster has a Maney belt drive and standard plates, easy lever pull and there is no slippage even with a load and pillion)
It has a 40 mm belt drive (therefore dry) and 1st gear is quite tall in the 5 speed close ratio gearbox.
It has all standard plates, steel and bronze, it is a Maney clutch basket (so not ultra light weight) and was very poor off the line and would slip once over 6400 rpm under load.
The lever pull was light, so I thought it was the motor power making it slip.
I tried putting in new bronze plates, no change, I cleaned it thoroughly with Brakekleen after every practice and every race, no change.Grit blasted the friction plates, no change.
Tried a different diaphragm, no change. Checked the stack height and plate thickness many times, all proving correct .
Checked for info on the forum , seems I had an older thicker pressure plate, so instead of buying a new one, I had it skimmed down close to the thinner plate specs. My diaphragm wasnt going concave enough at rest it seemed.
Now no slippage anywhere, still running all the same plate hardware, no slippage, will even pull a wheelie off the line at race starts.
the only thing that has changed is a slightly heavier lever pull , but that is fine at the expense of nil slip!
The bronze plates will do the business given everything else is right!!
Regards Mike
It has a 40 mm belt drive (therefore dry) and 1st gear is quite tall in the 5 speed close ratio gearbox.
It has all standard plates, steel and bronze, it is a Maney clutch basket (so not ultra light weight) and was very poor off the line and would slip once over 6400 rpm under load.
The lever pull was light, so I thought it was the motor power making it slip.
I tried putting in new bronze plates, no change, I cleaned it thoroughly with Brakekleen after every practice and every race, no change.Grit blasted the friction plates, no change.
Tried a different diaphragm, no change. Checked the stack height and plate thickness many times, all proving correct .
Checked for info on the forum , seems I had an older thicker pressure plate, so instead of buying a new one, I had it skimmed down close to the thinner plate specs. My diaphragm wasnt going concave enough at rest it seemed.
Now no slippage anywhere, still running all the same plate hardware, no slippage, will even pull a wheelie off the line at race starts.
the only thing that has changed is a slightly heavier lever pull , but that is fine at the expense of nil slip!
The bronze plates will do the business given everything else is right!!
Regards Mike