variable pressure clutch

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Jan 10, 2012 | 11:50 AM

67wizard

Thread Starter

Cruiser

Joined: Jan 2010

Posts: 129

Likes: 1

From: Near Las Vegas,Nv

variable pressure clutch

I have been thinking about getting a variable pressure clutch on the bike. Any pros or cons about doing this? Can you recommend a good company?
Did a motor upgrade, no matter what I do it seems like the clutch slips when you crank it on from about 3k rpm in six'th gear. It don't do it all the time tho. Some times when cold or after bike is warm.? ? ? ?

All ideas are welcome.
Thanks

Jan 10, 2012 | 11:56 AM

mkguitar

Extreme HDF Member

Joined: Sep 2010

Posts: 14,744

Likes: 402

From: Phoenix '53, '88, '09 Big Twins

the stock clutch is easily upgraded for higher pressure with springs, worn discs and steels may need to be replaced.
( more spring pressure means more left hand pull)

if you need to replace, barnett is the first name in clutches, so start there.

standard clutch adjustment is done with the bike cold and is calculated to be effective hot/cold--- as all the tolerances in the clutch basket change with temperature. It's possible that yours is slipping due to wear or needs finer adjustment within the range.

dry clutches are even harder to adjust hot/cold, but at least you can ride with the cover off and a wrench in your pocket to fine tune it when adjusting.

mike

Jan 10, 2012 | 12:44 PM

aviscomi

Grand HDF Member

Joined: Jul 2007

Posts: 3,681

Likes: 463

From: Philadelphia

Here's the link AIM where I purchased mine:
http://www.aim-tamachi.com/home.php?cat=3

These VPC's help in engines that are putting out high torque as well as with blowers.

Jan 10, 2012 | 02:34 PM

jvvjvv

Tourer

Joined: Aug 2010

Posts: 451

Likes: 4

From: Oakland, Ca

I am running the AIM unit........very mild build...........98/93, but I did not want to increase the clutch pull, being my grip it not what it was 50 years ago. I can sit at a stop light forever with the lever pulled in and slip it taking off in 2nd gear very nicely.........(testing it when it was first installed). Have over 15k on it now and it still works better that the stock set up.

Jan 10, 2012 | 06:29 PM

NorCalFBLO

Road Master

Joined: Feb 2011

Posts: 992

Likes: 20

From: Arizona

when I went to the 103 my number were 111.18 and 116.94tq. my clutch was slipping in 4, 5, & 6 at higher RPM's. I did not want a harder clutch lever pull so I went with the AIM variable pressure clutch. It was an easy install and solved my slippage problem. I would not hesitate putting one on.
http://www.aim-tamachi.com/home.php?cat=3

Jan 10, 2012 | 06:35 PM

aviscomi

Grand HDF Member

Joined: Jul 2007

Posts: 3,681

Likes: 463

From: Philadelphia

There are many instances on higher torque builds where the clutch slips and its only noticable on a Dyno graph.

Jan 10, 2012 | 07:12 PM

Lonewolf176

Stellar HDF Member

Joined: Sep 2007

Posts: 2,458

Likes: 671

From: Vancouver Island B.C.

Quote:

Originally Posted by 67wizard

[I]I have been thinking about getting a variable pressure clutch on the bike. Any pros or cons about doing this? Can you recommend a good company?
Did a motor upgrade, no matter what I do it seems like the clutch slips when you crank it on from about 3k rpm in six'th gear. It don't do it all the time tho. Some times when cold or after bike is warm.? ? ? ?

Vpc's work well. Only problem is they don't work until 3500 rpm+. They do have a reduced pull at lower rpm's. Combine it with a good spring and the slip should be gone, and still maintain "stock" type pull at lower rpm's.