Panhead clutch release arm length?

Want more throw on my pressure plate not sure best way to go.

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radar
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Panhead clutch release arm length?

#1

Post by radar » Wed Mar 25, 2020 8:27 pm

Howdy Panheads

I have a ‘52 chopper with a mousetrap eliminator or I guess shovel style clutch release arm on the ratchet top with a york clutch. It barely has enough throw on the release pushrod. I had to take off a set of fat repop oldschool rubber grips just to get enough release so that I can find N at a stop without too much trouble. With a foot clutch it has a ton of throw and can easily ‘oilcan’ the clutch diaphram spring which has an action like an archery compound bow where it is very easy to hold forever at full lock. I never used a mousetrap and I’d have to weld the paughco frame to take one, but they do a similar thing, as does a rocker foot clutch, with an overcenter spring.

So I want to get more travel out of my hand lever (aftermarket piece) or out of my clutch arm (maybe a shorter one I could make or buy is the answer?)

My clutch arm is 6 1/2” from pivot center to cable attachment.
My lever pulls 5/8” on the cable
My pressure plate moves about .045” outboard

I don’t want to adjust the cable any longer for fear of overworking the throwout bearing. There is not the 1/16” of play in the cable I want to see, more like it is barely snug but not under tension. I do have the big heavy early style cone bearing which looks robust.

So do I make the arm shorter? Do I have the wrong arm? Do I whittle on the lever or shim it forward on the handlebar to get a longer throw?

Or maybe it’s just marginal and I deal with it or clutter things up with a mousetrap, or go back to a foot clutch which can throw really far even with the long release arm up over the clutch basket?

I’d like to make it work as is but not sure if I’m missing something. Making all aftermarket stuff work together can be touchy and require creativity sometimes.

Thanks!
Radar
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Andygears
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Re: Panhead clutch release arm length?

#2

Post by Andygears » Thu Mar 26, 2020 12:51 am

At 6 1/2 inches the arm should be almost in line with the seat post tube where it bends up. The big throw out bearing is good, provided the kicker cover has room to get full movement. If you get enough movement with the foot clutch arm, with the big bearing, and that kicker cover and the same pushrod adjustment, then maybe the square hole in the clutch arm is made in the wrong orientation (rotated) to the length of the arm. Hold your foot clutch arm up to the trans and see if the square looks right. Hard to tell but your picture looks like your arm is pretty far rotated (looking down clockwise) forward at rest.

Andygears

awander
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Re: Panhead clutch release arm length?

#3

Post by awander » Thu Mar 26, 2020 2:55 am

Why would you need to weld on the frame to install a mousetrap?

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Re: Panhead clutch release arm length?

#4

Post by RooDog » Thu Mar 26, 2020 6:22 pm

The mousetrap usually lives on the other side of the bike. How about some pics of what's going on over there?
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Re: Panhead clutch release arm length?

#5

Post by RUBONE » Thu Mar 26, 2020 6:30 pm

Why not just change the handlever to one with a greater throw? They exist.

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Re: Panhead clutch release arm length?

#6

Post by awander » Thu Mar 26, 2020 6:43 pm

RooDog wrote:
Thu Mar 26, 2020 6:22 pm
The mousetrap usually lives on the other side of the bike. How about some pics of what's going on over there?
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Roo, what do you mean by that? Did he say he would install the mousetrap on the right side?

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Re: Panhead clutch release arm length?

#7

Post by RooDog » Thu Mar 26, 2020 6:55 pm

His picture is of the right side. The MT and all related issues go on the left. It would be nice to see what he has there and then perhaps we, as a group, can figure what is amiss. Or am I missing something here? Though they seem complicated, a mouse trap clutch booster is really a quiet simple piece of equipment, and easily set up and adjusted if one has all the correct parts, and a bit of mechanical G2, no?

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Re: Panhead clutch release arm length?

#8

Post by awander » Thu Mar 26, 2020 7:27 pm

RooDog wrote:
Thu Mar 26, 2020 6:55 pm
His picture is of the right side. The MT and all related issues go on the left. It would be nice to see what he has there and then perhaps we, as a group, can figure what is amiss. Or am I missing something here? Though they seem complicated, a mouse trap clutch booster is really a quiet simple piece of equipment, and easily set up and adjusted if one has all the correct parts, and a bit of mechanical G2, no?
Got it, thanks....

I agree on the mousetrap-works like a charm!

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Re: Panhead clutch release arm length?

#9

Post by RooDog » Thu Mar 26, 2020 8:11 pm

His York clutch is a Tedd Cycle knock off of the Rivera Primo Pro Clutch. I know the Rivera is a good piece of equipment, I have one in my Big Red Evo, but I know nothing of the V-Twin piece....

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