Yoyodyne slipper clutch on the way!

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KTMPerformance said:
We have been in the works with Yoyodyne to produce an aftermarket slipper clutch for the RC390 and 390 Duke. Yoyodyne's slipper clutches will retain the factory fibers and steels. Extreme High quality. These should be ready in about a month and we have the first 10 exclusive to us. We would love to provide you guys with a group buy and get them to you for a special price. Retail will be $850 but if you are one of the first 10 the price is $760 and our will come with a KTM OEM clutch cover gasket like always.

This slipper kit will compliment the motor kit that will be finalized very soon!

View attachment 1621

Let us know who is interested?
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PM sent. Count me in as well. Yoyodyne slippers are quite good. I've got on installed on my 675.
 
cjwell

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Look what the cat drug in today :). This is the first one for "testing" purposes. It has not been hard anodized yet. After fitment and function has been verified the production units will be finished up. I apologize for the amount of time it has taken vs quoted. Sit tight I promise they are almost ready.

SLIP.jpgSLIP2.jpg
 
KTMPerformance

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Well we sent our prototype out to Ari Henning to test the slipper and put the final touches on it, Here's his review

Ari said:

When Chad contacted me to see if I could test this new prototype slipper, I still had a bunch of work to do to the bike to get it ready for the track and didn’t know if I’d have time to install the kit. Thankfully Chad’s directions were clear and it was a quick job. I laid the bike on its side so I wouldn’t have to drain the oil, and I had the thing buttoned up in 30 minutes.
I had my doubts about the need for a slipper on such a small, relatively slow bike (I’ve always relied on clutch-lever finesse rather than a slipper on my CBR300R and CB350), but as it turns out the Yoyodyne setup is pretty trick and definitely helped simplify corner entries. At Chuckwalla you only ever drop two gears at a time, but you do so while trail braking so there’s some care required. With the slipper there was no need to finesse the lever or wait for the chassis to settle to drop another gear—just toe the shifter and throw the clutch. As delivered the slip is smooth and consistent and keeps the back tire stable and in line. In the paddock I even tried going from 4[SUP]th[/SUP] to 1[SUP]st[/SUP]—all at once—and didn’t experience any hop or chatter, though the rear tire did smear.

All in all I’m impressed not only with how well the slipper works but with how easy it was to install. I still enjoy the challenge of coordinating the clutch, throttle, front brake, and other controls (that’s what makes riding fun!), but for anyone that doesn’t want to deal with feathering the clutch this is an ideal solution.


Ari Henning
Senior Road Test Editor
Motorcyclist magazine

ariwork.jpgtrack.jpg
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KwicK To Master KTM

KwicK To Master KTM

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Very smooth changes - nice

Although off topic what pipe is that on the test bike ? it sounds really sweet - and is it running a K& N with the open lid? Thanks
 
cjwell

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picto said:
does anyone know the weight difference in the OEM slipper clutch vs the yoydyne?
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Never weighed, this is one place where if it weighs more than OEM is not a concern due to the "value" added in performance, quality, adjust ability, and durability.
 
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cjwell said:
Never weighed, this is one place where if it weighs more than OEM is not a concern due to the "value" added in performance, quality, adjust ability, and durability.
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True but the European bike for 2016 come with the slipper clutch now fitted, so does it still make sense to change.
I understand that the ramp system is not the best on the oem ktm, but it good enough for most track use.
So the added advantage would be more slip control on the clutch and possible less weight to have to spin up in the motor?

I cant wait to the you guys in the states start working on the 2016 bike, with ride by wire, slipper clutch etc.
 
cjwell

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picto said:
True but the European bike for 2016 come with the slipper clutch now fitted, so does it still make sense to change.
I understand that the ramp system is not the best on the oem ktm, but it good enough for most track use.
So the added advantage would be more slip control on the clutch and possible less weight to have to spin up in the motor?

I cant wait to the you guys in the states start working on the 2016 bike, with ride by wire, slipper clutch etc.
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It's just the previous duke 390 clutch in it as far as I know. Several guys here switched to it into their RC's. Less than stellar results like always...... You'll never know the difference in a couple ounces of clutch components in terms of rotating engine mass ;).
 
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