Hi All,
I am just putting the clutch on my 1973 Penton Hare Scrambler (250 ccm) engine.
(http://i1341.photobucket.com/albums/o746/andreas_g_piepke/Penton/100_3747_zps0169a127.jpg)
I am wondering about the proper adjustment of the screws compressing the clutch springs. The manual states that "3-4 threads should be showing", which is a bit sketchy. Would anybody on POG have a distance from "end of bolt to top of nut"? The way I have set this now is to achieve equal 2.5 mm for protruding thread.
As always your technical wisdom would be greatly appreciated!
Andreas
Get a dial indicator and spin the clutch, then adjust each nut until you get as close to zero play at the outside edge of the pressure plate. I found out the hard way that trying to do it the way the manual says is an exercise in futility. Someone here told me to do it with the dial indicator and it is absolutely the best way to do it.
Brian
Brian, thanks for the input! This sounds like a good procedure. However, it only answers part of my question. Your procedure with the dial indicator will for sure result in a tightening pattern that gives uniform pressure of the clutch plate on the disks. I still need to know how much pressure is needed. So how tight do you set the bolts? As I said in my previous post: for the moment tried to achieve 2.5 mm thread protruding from the nut but don't know whether this will result in the clutch (a) not slipping under load, and (b) still separating properly.
Thanks again
Andreas
I usually try to have 2-3 threads showing on a 250 or 400.
I would initially set them at the recommended 3 threads showing, and then adjust with the dial indicator as Brian mentions. Set one stud and nut, then measure the distance. The threads are precise enough that I'll bet the outer plate won't be more than a few thousands out and won't take much to dial in. A friend of mine that was a Penton dealer back in the day has told me that they used to use a dial indicator for assembling clutches back then also. The actual distance that the stud protrudes from the nut may not be critical at all, and just needs to be "in the ball park" so to speak, and thus the mention of the number of threads in the manual.If you good plates, springs, and everything prepared properly, I think it will function the way it should.
Type at you later,
Dan McEntee