Clutch Ramp and Ball Testing Page1
btw...if you can't get neutral super easy, then you ain't much of a motorcyclist.
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 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
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.
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.
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.
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.
The Best of Harley-Davidson for Lifelong Riders
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.
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.












