Slipping clutch

swooshdave · May 25, 2014

I'd complained about this before. When I give the throttle a good whack in 3rd or 4th it slips. So far my solution has been… not to whack the throttle.

I was looking for something in my garage today and ran across a set of new Barnett clutch plates. Apparently I had got them and forgot about them…

Take one bike off the lift and put the Norton up there. Still have to shuffle stuff around in the garage.

WIth a dry primary it's so fast to get to the clutch. I doubt it took me 30 minutes to swap out the plates.

The old plates were the fiber ones.

It feels about the same, a very light clutch. I hope to get out soon and see if it made a difference. It could be that the spring is worn out. I don't think I can shim the plates out as I wouldn't be able to get the retaining clip back in. We'll see.

Time Warp · May 25, 2014

Ludwig...

another-failed-sparx-stator-t19432.html

davamb · May 25, 2014

I'm running a Barnett set Swoosh and never had a problem. Smooth takeup and absolutely zero slip.

olChris · May 25, 2014

Quot "I was looking for something in my garage today and ran across a set of new Barnett clutch plates. Apparently I had got them and forgot about them…e "

:lol: :lol: :lol: you do that as well hahahah.. Guess your over 60 also .. :lol: :lol: :lol:

pete.v · May 25, 2014

I may be having Sunday morning brain farts, but why wouldn't it slip in 1st or 2nd?

It looks like you belt is a little tight.

swooshdave · May 25, 2014

pete.v said:
I may be having Sunday morning brain farts, but why wouldn't it slip in 1st or 2nd?

It looks like you belt is a little tight.

Belt is fine.

swooshdave · May 25, 2014

olChris said:
Quot "I was looking for something in my garage today and ran across a set of new Barnett clutch plates. Apparently I had got them and forgot about them…e "

:lol: :lol: :lol: you do that as well hahahah.. Guess your over 60 also .. :lol: :lol: :lol:

Sadly… no.

bill · May 25, 2014

dave
if you are running 4 plates and a higher stackup it is very marginal in its holding capacity. there are a few mod's you can do to get 5 surflex plates in and you can also machine the steel plates ID to make them narrower which will increase the holding capacity.

concours · May 25, 2014

pete.v said:
I may be having Sunday morning brain farts, but why wouldn't it slip in 1st or 2nd?

It looks like you belt is a little tight.

In the higher gears, the engine is allowed to make full torque, showing a weak clutch. In the lower gears, the bike accelerates so easily, the torque required to slip the clutch isn't achieved. Very common failure mode, clutch slips in high gear first, gets worse, lower gears. All clutches, cars, bikes, etc.

BrianK · May 25, 2014

That reminds me, I've got a set of the Barnett plates around somewhere.

I bought them when mine started slipping a while back. Took them out, they looked fine, so I cleaned and replaced....work fine.

The Barnetts went back into the parts bin....somewhere.

swooshdave · May 25, 2014

I believe the goal should be to get the spring just below the groove, which I think I have.

http://www.oldbritts.com/ob_clutch_info.html

I'll know more when I get a ride in. Today was pressure washing the driveway...

concours · May 25, 2014

swooshdave said:
I believe the goal should be to get the spring just below the groove, which I think I have.

http://www.oldbritts.com/ob_clutch_info.html

I'll know more when I get a ride in. Today was pressure washing the driveway...

This is the right stuff. http://atlanticgreen.com/clutchpak.htm
http://atlanticgreen.com/ndnsclutch.htm
Follow the road map DynoDave drew, and arrive exactly on location.

DogT · May 25, 2014

It probably depends on the pressure on your stack. I tried adding a plate to mine to lessen the lever pull, it made a real light clutch lever, but it slipped like anything. If you have the means to adjust your stack height with plates or lowering the pressure plate height, you could probably figure out a place where the clutch doesn't slip, but it's really all about the pressure from the spring plate on the stack as I read it. DynoDave has the answers, but you still need X amount of pressure on the plates to make them engage fully and I'm sure every clutch basket is a bit different. I can't even get near the place where it's hard to put the stack ring in, it seems I need a certain amount of clearance with the ring or it slips. Just my experience and believe me I've played with it.

I've heard of guys that get away with whacking out every other spring on the spring plate???

swooshdave · May 26, 2014

Test = fail. No difference from the fiber plates.

I had put in a steel plate first, thinking the alloy basket needed that as protection.

So I took out the first steel plate and assembled (per the RGM instructions…) and now I have a nice solid clutch. It's a stiffer pull than before but I bet it doesn't slip.

Another test ride this week will verify.

DogT · May 27, 2014

It's all about stack height and pressure on the plates.

Excuse me, I'm repeating myself.

swooshdave · May 27, 2014

DogT said:
It's all about stack height and pressure on the plates.

Excuse me, I'm repeating myself.

It's all about reading the instructions and actually following them. :mrgreen:

Snorton74 · May 27, 2014

While you're in there ya might replace that tab washer and outside tooth lock washer with bellville washers. I got extras from McMaster Carr if you need some.

swooshdave · May 31, 2014

Clutch now works wonderfully. No slipping in top gears.

DogT · May 31, 2014

So as I read it, you had too much stack height? (Which reduced the pressure on the clutch pack?) Just curious.

Dave

swooshdave · May 31, 2014

DogT said:
So as I read it, you had too much stack height? (Which reduced the pressure on the clutch pack?) Just curious.

Dave

Yup.

Slipping clutch

swooshdave

Time Warp

.......back to the 70's.

davamb

olChris

pete.v

swooshdave

swooshdave

bill

concours

BrianK

swooshdave

concours

DogT

swooshdave

DogT

swooshdave

Snorton74

swooshdave

DogT

swooshdave

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