1951 panhead clutch

the bike makes a noise and it jerks

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51 moneyhog

1951 panhead clutch

#1

Post by 51 moneyhog » Sun Oct 23, 2005 4:00 am

I have a 51 panhead with primary belt drive and Kevlar clutches. When I first take off in first gear the bike makes a noise and it jerks. It does this until the clutch grabs. It seems to get better when the bike warms-up. I never had this problem when I had the original Harley clutches in it. Problem started when I put in Barnet Kevlar clutches. Do you know what kind of clutches might be better so I don't have this problem and something that has an easier pull on the hand clutch. The one I have now is very stiff and is a bear in traffic.



foot

Re: 1951 panhead clutch

#2

Post by foot » Mon Oct 24, 2005 4:56 am

Barnett recommends soaking them in Ford ATF fliud for at least 15 minutes & them wiping them off prior to install. Mine work fine. Have you done this important step ??

Kuda
Posts: 348
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Location: Maryland

Re: 1951 panhead clutch

#3

Post by Kuda » Mon Oct 31, 2005 2:24 pm

Did you change the steels? Reason I'm asking is I rebuilt mine about three times before my dumb @ss realized that the steels were all plain, not the ball end or "rattler" steels. Finally ordered a pair of rattler steels (don't need all the steels to be rattlers, two is fine, one in the front and one in the back) and all is well again. It was just about to drive me NUTS...

-Kuda
'49 FL

caschnd1
Posts: 606
Joined: Tue Apr 25, 2006 3:45 pm
Bikes: 1949 FL Chopper

Re: 1951 panhead clutch

#4

Post by caschnd1 » Mon Oct 31, 2005 3:00 pm

Interesting. I run all plain steels (no rattlers) and have never had any issues with the clutch "grabbing". The only difference I've noticed between steels with and without the rattlers (buffers) is the sound.

-Craig

ArizonaMike
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Joined: Thu Oct 18, 2007 1:19 am

Re: 1951 panhead clutch

#5

Post by ArizonaMike » Tue Nov 01, 2005 2:52 am

I'm having a similar problem--when I release the clutch lever the clutch jerks 2-3 times with a creaking
noise with each jerk, until the bike starts rolling. Anyone know what to look at? Thanks in advance for
all replies.

Forgot to add--I've installed a BDL belt drive inside the tin primary, if this makes a difference.
Mike Colaizzi

kell
Posts: 404
Joined: Sat Jun 19, 2004 2:58 am

Re: 1951 panhead clutch

#6

Post by kell » Tue Nov 01, 2005 5:59 am

I have a Barnett clutch that does that.
It's stick-slip motion. Fingernail on a chalkboard.

Imagine you have a block of felt and a block of soft rubber, and you want to slide them on a formica tabletop. The felt will glide, but the soft rubber will screech when you try to push it across the surface. Barnett plates are like the rubber, instead of gliding you get stiction.
It makes a real nasty sound.
If I wasn't so damn cheap I'd get a new set of plates that doesn't do that. (Previous owner put the Barnett plates in).

Hey money if you run the "mousetrap eliminator" setup your clutch will have a hard pull, no getting around it. Lube your cable and make sure there's no binding in any of the parts that move when you pull the clutch in. Try backing off the nuts on the pressure plate springs as much as you can without making the clutch slip.

Panama
Posts: 10
Joined: Thu Aug 30, 2007 9:13 pm
Location: Apple Valley, CA

Re: 1951 panhead clutch

#7

Post by Panama » Tue Nov 01, 2005 7:06 am

If you soak the Barnett clutches in Ford ATF fliud for at least 15 minutes, then wipe off, it won't do that.
That IS Barnett's recommendation anyway..
I have No problems like that, with the Kevlar clutches.

Kuda
Posts: 348
Joined: Tue Aug 01, 2006 5:41 pm
Location: Maryland

Re: 1951 panhead clutch

#8

Post by Kuda » Tue Nov 01, 2005 3:27 pm

First I've heard of soaking them, I admit. Would you do that even if you run 'em dry, like with a belt primary?

-Kuda

mbskeam
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Re: 1951 panhead clutch

#9

Post by mbskeam » Wed Nov 02, 2005 3:15 am

hello,
the friction plates that I run in mine are the police special that V-twin sells. (green ones) have 25000 on them and they where used when I put them in, so they have more miles than this. I tryed a set of alto plates, but they slipped and back in went the old ones.
are your steels flat, and the pressure plate also?
what springs do you have? if you have foot clutch I bet it is hard to pull.
are the studs on your hub smooth or do they have grooves from wear?
do the the plates and friction disks holes line up to the studs or drag?
do you have a ram jet ret?. these work very well. to stop most of what you describe.

mbskeam

kell
Posts: 404
Joined: Sat Jun 19, 2004 2:58 am

Re: 1951 panhead clutch

#10

Post by kell » Wed Nov 02, 2005 3:40 am

Kuda wrote:
First I've heard of soaking them, I admit. Would you do that even if you run 'em dry, like with a belt primary?

-Kuda
Yes, that recommendation is for dry clutches.

bibs
Posts: 83
Joined: Fri Jul 13, 2007 1:12 pm

Re: 1951 panhead clutch

#11

Post by bibs » Thu Apr 13, 2006 1:14 am

I have a 53 pan with mouse trap.....everything is new!!! all good stuff....but the clutch drags in first gear and is difficult to get 'er in neutral.The clutch hub is a 5 stud(new) new alto plates and 4 anti rattler steels....I also have the roller bearing arrangement,the clutch is smooth as velvet....but she wants to creep in gear.The clutch rod is pushing out the pressure plate a good 1/4-5/16ths of an inch...so that isnt the problem......um thinking that the 4 anti rattler plates are!! Am I close?

mbskeam
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Re: 1951 panhead clutch

#12

Post by mbskeam » Thu Apr 13, 2006 1:30 am

you might try and open up the holes that the studs ride thru, just a bit. they may be not sliding free, (apart), and if that does not work check your pressure plate, is it flat?
and lastly you could try a ram jet, had one on mine for a long time and it works, and they are cheap to buy.

mbskeam

108
Posts: 179
Joined: Sun Aug 06, 2006 8:12 pm
Bikes: 1948 FL 74in Panhead Chopper , 1958 Zundapp Citation 500
Location: Indianapolis

Re: 1951 panhead clutch

#13

Post by 108 » Thu Apr 13, 2006 2:54 am

Bibs, The main problem is the anti-rattler steels . The ball and spring grips the drive lugs inside the drum to stop the rattle but this drag prevents the plates from floating apart when the preesure plate lifts . If they dont seperate freely, one or more steels rubbing a plate is all it takes to cause that crunching into first and draging shifts. Best thing I ever did was to remove the balls and bend/file the holders so that each lug had equal clearance and check the stud holes or anything causeing any drag on the steels. BTW, my 48Fl has a 1 1/2 belt, half-stroke rocker ,original tin cover , Ram-Jet retainer and 5 plates with no buffer. It's smooth and works perfect.

Billy
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Joined: Tue Mar 23, 2004 6:57 am

Re: 1951 panhead clutch

#14

Post by Billy » Thu Apr 13, 2006 3:41 am

bibs-

If/when you pull them out, (I know you said they were NEW) but I'd still put a 'straight-edge' across the steels just to rule out the possibility of warped plate(s)

I use the Ram-Jett retainers too. They work great!!

fourthgear
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Location: north florida

Re: 1951 panhead clutch

#15

Post by fourthgear » Thu Apr 13, 2006 12:18 pm

My new alto's make that noise when cold and all I do is slowly let the clutch out at first when cold , doesn't do it after warmed up and I don't remember if I soaked them or not . I will be pulling the clutch plates @ five hundred miles on new system this weekend and maybe I will soak them to see if it makes difference, sounds like sound advice.
Does the ram jet take care of that rattle when clutch is pulled in ? My new clutch hub came with some kind of retainer , is it junk?

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