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Super Slipper Cluitch. . . ? ? ?

Mr_Damage

Mr_Damage

Joined Apr 2009
93 Posts | 0+
Bromsgrove
Just a thought, I wonder if anyone else has tried it.

After a couple of track days, I realise how crap the vacuum slipper clutch is.
. . . then I had an idea. . . .

Take a vacuum from both inlets, two non retun valves, so as not to have one vacuum suck into the other, then t-piece them together, before splitting them again to go to the throttle valve and clutch.

If I end up with too much vacuum then it would be possible to have an adjustable valve from one, to control the amount of vacuum, then hey presto an adjustable slipper clutch

Might be worth a try !!
 
yeh, its quite a basic vacuum driven slipper clutch. There are a few threads on here talking about them and explaining how they work.
 
I was under the impression that it was only the 04 onwards that had the slipper clutch:dunno
 
Spud monkey said:
I was under the impression that it was only the 04 onwards that had the slipper clutch:dunno
Click to expand...

Nope, correct me if I am wrong, however I believe the 98 Mille was the first production bike to use a slipper clutch.............

Or it could have been the TLR :confused
 
I thought it had some kind of system on it as soon as rode it for the first time, giving it the berries over the mountain drop her down a cog expecting a load of engine braking,instead i got a nice soft clutch engagement.. happy bunny!!.....:thumbup
 
it is a crap system on the aprilia, the throttle has to be closed for it to work on the downchange :dowhat
 
If you blip the throttle i believe the slipper wont work, so you do either one or the other
 
I had NO problems with it at Brands, was able to just roll off the throttle and go down the gears without a lockup or any scares.

Yes it is agricultcheral but it was designed over 10 years ago and hasnt been updated since (unfortunately)
 
OZMILLE said:
Nope, correct me if I am wrong, however I believe the 98 Mille was the first production bike to use a slipper clutch.............

Or it could have been the TLR :confused
Click to expand...

Nope it was the zx7r (or the zxr before that, my memory isn't that good anymore.

Just Kawasaki called it a back torque limiter and set it with next to no slip as std. It needed a couple of thinner steel plates to activate it properly
 
OK then, maybe I should also look at the performance of the slipper clutch as is. I Do not blip the throttle at all, and try to use the engine braking / down shift carefully, but I have had a few great slides as the slipper is obviously not working as it should. I have checked and remade the vacuum pipe ends and checked by sucking the pipe that they hold a vacuum whick they seem to. I'm not sure how well the non return valve should work, it is free one way, but sort of leaks the other way, It seems to work a bit, but there is leakage through.
Any suggestions?

Interesting to hear other experiences of how well it works? So far I think its rubbish. . . .
 
I think for street it's ok. Just don't bleep throttle. For track work it's pushing it, if what you expect is a mechanical slipper clutch.
 
If the valve (its like a reed) passes air in both directions its fooked, if it doesnt hold under vacuum its fooked.

Get a replacement (I think its been upgraded) they aint a million dollars :thumbup
 
If it is working as it should it works fine on the track, i have never had bother and neither has many other mille riders i know who are quick riders and some who race with them as well, the slipper clutch works fine on track so i reckon yours is in need of some attention :thumbup
 
Thansk for all the advice. I've ordered a new non return valve and I'll fit all new pipes and clips.
 

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