Lockup Clutch

 

Introduction:

 

If your riding a modified RD then there is no way the stock clutch system is going to keep up with the power output from the engine. 

 

I tried and failed with all the following method, your mileage may vary.

Options I didn't try which may have helped. (Thanks Mark)

 

The only option left seemed to be a lockup clutch. Mutt and Ric who where running this helped me locate one from Mundroch Racing Enterprise. I picked it up in the US. The kit came with no instructions on how to install or setup.

 

Hence this document which should help people in installing one. I wish there was something like this out there when I installed my kit. This is by no means the only solution or way of doing it nor is it in anyway a recommendation for every ported motor to go out and install one. The bike is being prepared for a Drag Race. 

 

The clutch slipping problem may also have something to do with my weight 108Kgs. Thinner riders who have taken the bike for a spin haven't noticed much clutch slippage.

 

 

The Steps:

 

Step One: Ventilate the Clutch cover. Best done on a lathe.

 

 

 

Get One block of aluminum. Either Round or Square Diameter should be 6.5 Inches height should be 48mm  Machine the outside diameter to 156mm or 6.2”. Machine the Inside diameter to 126mm.

Then machine a 10mm collar on one of the ends to 138 mm. The height of the step should be 5mm.

Step 3:

Push fit the Collar into the case cover. As the clutch cover is not flat be careful to make sure the plate is seated flat and then weld it into place. This would mean the collar towards the oil pump end will go in more than the collar at the other end.

 

What you get should look like this

And on the inside:

Installed on the bike with the clutch basket and the lockup unit it should look like this.

 

 

For the Cover you can use four No:8 Allen bolts  or even 8. To screw on a glass cover. To help avoid oil leaking you can cut a collar into the glass cover. If you like I will add pictures off this last step soon. This also means that the foot controls need to be moved behind. For which we have made a set of foot controls that can be mounted onto you rear passenger foot rests. That how to project follows. I think you guys call them rear sets. The costs involved in doing this where. Though I did find that the the cover works fine on a stock setup i.e. you don't really need to move the controls around.

 

The See through cover. With a step to keep the oil in.

Post weld the cover

 

Metal Block 15$

Machining Work on Lather 15$

Plexi Glass 8$

Allen Bolts 2$

Total=40$ / Rs 1600/- in India.

(Sorry none of the items on this page are for Sale this is purely a How-To)

 

Man I love this. The clutch feels light like a feather and when it locks up it locks-up

Im going to put one on my street bike too. As the Speed of the rear wheel builds the arms off the clutch get thrown out with centrifugal force. This presses down on the clutch plates locking them. As the arms are doing all the work. Ive since reverted to stock springs. And only 3 off them. So the clutch can get pulled in with a little finger. Very very light. This clutch has helped me shave a good second off my quarter times. 

 

Regards

Chinoy

rchinoy@usa.net