Softail Models Standard, Custom, Night Train, Deuce, Springer, Heritage, Fatboy, Deluxe, Rocker and Cross Bones.
Sponsored by:
Sponsored by:

Clutch Ramp and Ball Testing Page1

Thread Tools
 
Search this Thread
 
Old Jan 12, 2026 | 09:04 AM
  #11  
Gomer's Avatar
Gomer
Thread Starter
|
Cruiser
15 Year Member
Photogenic
Photoriffic
Liked
Joined: Feb 2007
Posts: 144
Likes: 131
From: West Michigan
Default

Thanks Max, I read the entire thread, good read, that math hurt my head though.
 
Reply
Old Jan 15, 2026 | 08:32 AM
  #12  
NORTY FLATZ's Avatar
NORTY FLATZ
Seasoned HDF Member
Photogenic
Shutterbug
Liked
Joined: Jan 2015
Posts: 16,013
Likes: 7,139
From: Sandy Eggo's North County
Default

Best to just get an EZ-Boy extension. $25 and it's a quick install. 100% lock-up and no creep, easy to get neutral too.

btw...if you can't get neutral super easy, then you ain't much of a motorcyclist.
 
Reply
Old Jan 15, 2026 | 03:32 PM
  #13  
98hotrodfatboy's Avatar
98hotrodfatboy
Seasoned HDF Member
15 Year Member
Liked
Loved
Joined: Mar 2010
Posts: 21,116
Likes: 7,640
From: Poolville
Default

Originally Posted by NORTY FLATZ
Best to just get an EZ-Boy extension. $25 and it's a quick install. 100% lock-up and no creep, easy to get neutral too.

btw...if you can't get neutral super easy, then you ain't much of a motorcyclist.
Some bike just don't have enough clutch separation making it difficult to find neutral.. Especially if you use a Muller power clutch ramp...I think you forgot the LOL....
 
Reply
Old Jan 24, 2026 | 04:32 AM
  #14  
SJC69's Avatar
SJC69
Cruiser
5 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2018
Posts: 190
Likes: 148
From: Essex UK
Default

Originally Posted by Gomer
Great write up SJC69, thanks for the first hand input.

Mueller want you to start out with the ***** almost fully seated in the bottom of the ramps (1/8 turn out on clutch hub nut). I found I had more pressure plate travel with 3/4 turn out moving the ***** starting point up the ramps more.
My results:
all with 1/16" lever free play
- Clutch Hub Nut 1 turn out = .066" pressure plate travel
- Clutch Hub Nut 3/4 turn out = .066" pressure plate travel
- Clutch Hub Nut 1/2 turn out = .064" pressure plate travel
- Clutch Hub Nut 1/4 turn out = .062" pressure plate travel
I ran through the Clutch Adjustments again with Muller 2.0 as above on my 2016 TC 103, theses were my results with various settings of the Adjuster, basically no real difference as to lift and adjuster screw position.

I set the dial gauge up and basically use the too washers on the floor board as Go/No Go to set the cable free play at the handle bar to get some consistency.



My results were as below, all with 1/16" lever free play.

- Clutch Hub Nut 1 turn out = .054" pressure plate travel
- Clutch Hub Nut 3/4 turn out = .052" pressure plate travel
- Clutch Hub Nut 1/2 turn out = .052" pressure plate travel
- Clutch Hub Nut 1/4 turn out = .052" pressure plate travel
- Clutch Hub Nut 1/8 turn out = .054" pressure plate travel
 
Reply
Old Jan 24, 2026 | 09:38 AM
  #15  
Gomer's Avatar
Gomer
Thread Starter
|
Cruiser
15 Year Member
Photogenic
Photoriffic
Liked
Joined: Feb 2007
Posts: 144
Likes: 131
From: West Michigan
Default

That is weird why your reading don't change. I tried to measure the Mueller ramp angle with an digital angle gauge and a straight edge and found I couldn't get a good reading as the ramps were not a linear angle like the HD ones.

I'm wondering if your cable is not fully releasing allowing the ***** to fully seat in the bottom of the ramps. That would make all the settings similar as the clutch hub nut sets where the ***** start out on the ramps. If you are not starting out in the bottom with 1/8 turn out they would all be similar. When I put the ramps in I marked where the arm was when the ***** were seated and then made sure my cable would allow this. I found a lot of length difference in all the cable adjusters too.

You should be able to get in the 0.065 range of travel too.
I also put in an AIM pressure plate solid adapter, I'm wondering if you are losing travel because of this.


 
Reply
Old Feb 7, 2026 | 11:40 AM
  #16  
SJC69's Avatar
SJC69
Cruiser
5 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2018
Posts: 190
Likes: 148
From: Essex UK
Default

Right I fitted the third of the Muller 2.0 clutch ramps, this time to my 2018 year M8 Deluxe.

I had previously replaced the clutch ramps from the original 19 to the 21 degree.

Before I started the replacement I checked the clutch plate lift with the 21 degree ramps and stock lever:-

- Clutch Hub Nut 1 turn out = .08" pressure plate travel
- Clutch Hub Nut 3/4 turn out = .08" pressure plate travel
- Clutch Hub Nut 1/2 turn out = .09" pressure plate travel
- Clutch Hub Nut 1/4 turn out = .09" pressure plate travel

I then installed the 2.0 ramps and followed the Muller instructions and adjustments to set the screw to 1/4 turn out and the cable slack to 0.06" (1.5mm) with the addition of an adjustable Oberon clutch lever now fitted and set to the span setting 4 which Oberon say is near to stock lever span.
(I believe span setting 4 not to be correct as equivalent to the stock lever span on the M8, it is more like position 5 or 6 of the 8 positions, otherwise there is insufficient travel/movement to operate the clutch switch)

I set up the DTI and checked the plate lift.
Muller Specify minimum travel of 1.6 mm ( around 0.65") at the adjustment screw when pulling the clutch lever
I achieve in lever position 4 around 0.055" (1.4mm) and needed Lever in span position 6 to achieve the 0.65" (1.6mm) plate lift.
For reference at full span, lever position 8, 0.07" (1.80mm) was achieved.





I was happy with setting at lever position 6 and it met the specifications of the Muller 2.0 set up, what I would say is with adjustable levers, when changing the span this will have a direct effect on the plate lift and needs to be considered!

 

Last edited by SJC69; Feb 7, 2026 at 11:41 AM.
Reply
Old Feb 7, 2026 | 01:09 PM
  #17  
98hotrodfatboy's Avatar
98hotrodfatboy
Seasoned HDF Member
15 Year Member
Liked
Loved
Joined: Mar 2010
Posts: 21,116
Likes: 7,640
From: Poolville
Default

When it comes to Clutch diaphragm springs it appears to make a difference in clutch pack separation...
I have found that by using the stock spring part number 37871-98a that measures .071" thick I get .065" pressure plate separation.. I then installed an SE spring part number 37951-98 that measures .078" thick i only got .060" pressure plate travel.. I then installed the spring that came with my Evolution industries Clutch setup that measures .084" thick and I only got .055" pressure plate movement.. This was all done with an 18* clutch ramp..

I ordered a 21* ramp and also ordered a new spring plate part number 37807-03 that's supposed to be in between the stock and SE spring. I will tst and repost all specs when the parts come in..

The reason why I posted this to because it appears that the thickness of the spring makes a difference in the total travel of the pressure plate.. Just my findings...
 

Last edited by 98hotrodfatboy; Feb 7, 2026 at 01:34 PM.
Reply
Old Feb 7, 2026 | 01:22 PM
  #18  
Jackie Paper's Avatar
Jackie Paper
Seasoned HDF Member
15 Year Member
Community Builder
Liked
Top Answer: 1
Joined: Mar 2010
Posts: 38,612
Likes: 6,439
From: Honah Lee
Default

Gomer, that is one impressive thread.

Have you ever noticed how tight the steels and fiber clutch plates are on the hub and input shaft?

Always wondered if they where a tad freer, would the plates oil stick less on the cold start up and first shift when they break free from the spinning cluster gear in the transmission coming to stop?

Doesn't really take all that much throw on the clutch push rod to disengage the plates.
 

Last edited by Jackie Paper; Feb 7, 2026 at 01:23 PM.
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Feb 7, 2026 | 05:24 PM
  #19  
98hotrodfatboy's Avatar
98hotrodfatboy
Seasoned HDF Member
15 Year Member
Liked
Loved
Joined: Mar 2010
Posts: 21,116
Likes: 7,640
From: Poolville
Default

Originally Posted by Jackie Paper
Gomer, that is one impressive thread.

Have you ever noticed how tight the steels and fiber clutch plates are on the hub and input shaft?

Always wondered if they where a tad freer, would the plates oil stick less on the cold start up and first shift when they break free from the spinning cluster gear in the transmission coming to stop?

Doesn't really take all that much throw on the clutch push rod to disengage the plates.
And how much is that ??? ... I don't see how a statement like that would help anyone...
 
Reply
Old Feb 7, 2026 | 06:02 PM
  #20  
Jackie Paper's Avatar
Jackie Paper
Seasoned HDF Member
15 Year Member
Community Builder
Liked
Top Answer: 1
Joined: Mar 2010
Posts: 38,612
Likes: 6,439
From: Honah Lee
Default

Originally Posted by 98hotrodfatboy
And how much is that ??? ... I don't see how a statement like that would help anyone...
My question was directed at Gomer. It was for me since I have wonder about my question I ask Gomer. He definitely is technically.

Seen numerous post that a cold shift netural to first bang bothers newbies.

And yes, I do know how to eliminate it.

However, since you had to seem to want to lock me out of learning something, you ever stacked a 8 steel and 9 friction plate clutch. Only done two but they were tight sliding on.

Both with a standard OEM ramp, the backoff about a half turn and the cable set to minimum had a good 1/8 throw but I just eyeballed it. Could see some plate move a lot, others not so much.

At .080, you would have about .005 play. At .064 would be .004 play. That's pleanty. An oil wet doesnt wear unless it's slipping under load.

I really was wondering why they are manufacturered so tight a fit
 

Last edited by Jackie Paper; Feb 7, 2026 at 06:15 PM.
Reply



All times are GMT -5. The time now is 06:48 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE