Anyone running yoyodine or sigma slipper clutches?

[squirrel_hunter]

Arsebiscuits.

It appears we have a green hub and a black pressure plate.

I await the outcome...

[yorkie_chris]

Bump. Read the thread on WERA forum (yes I know it's 700 posts...). It looks like zoran from TWF has managed to get one to work without breaking in 20 minutes. Different washers on the hub needed by the look of it.

[yorkie_chris]

Originally Posted by SV650Racer

TBH I havent read the whole thread yet. The problem we have had with the back plate wear on the Sigma which looks the same as what is posted in that thread in one of the pics with the Yodo clutch and is down to the clutch slipping too long and too soon.

TBH it was hard to pick up. When I rode Steve's bike i couldnt notice it. Hence why Sigma are now doing a new race version.

This is what guy from yoyo was saying to guys on WERA, basically blaming riders when clutches were set up as stock on stock motor. Not good PR when it seems solution is so simple.

If you've had problem with backplate wear it is something different. Main problem is pressure plates wearing out stupidly fast.

Thats why I will always and only ever used a Sigma. The application we were using the SV clutch in was way beyond using it in a 72bhp minitwin.

Neil has been superb and Steve now has a new version of the clutch to work with the increased bhp and torque which is almost 18bhp over stock!

[yorkie_chris]

The sigma and yoyo look strikingly similar, and they both changed the colour of ano at same time. Almost like they are made in same place...

Possibly, probaly i dont know. All I know is the problems we have had were caused by us using the clutch in a bike that makes considerably more than stock being ridden very hard also. You sometimes get this with products. Neil has been spot on and now we have one that will work inside the parameters we require it to.

Ive had one also in my 600 supersport bike now for 2 seasons..spot on!.

[yorkie_chris]

It appears that the problem was there in slipper mode by the hub raising up and contacting the wrong part. (a ring around the pressure plate rather than the bottom of the spring pockets).

As you well know a slipper clutch acts exactly the same as a normal clutch under power and using insufficient spring pressure on a tuned engine would cause slippage under power and rapid wear.

This does not explain the rapid wear experienced by new clutches on stock motors, set up with stock parts and in some cases stronger springs. Both suppliers have downplayed the wear as hamfistedness despite the clutches being set up as recommended.

Here's a bolloxsed yoyodine:



Heres a sigma that's on its way to being bolloxsed:




Sarah as much as I know you have to stand by your sponsors this is not isolated wear caused by one nutter with 90bhp on standard springs. Some of bikes that have knackered the pressure plates have then been swapped back onto stock bits with same pack and springs and not broken anything.

Now it seems it is sorted by putting correct thickness washers in there so hub rises up to touch spring wells instead of edge of plate. Seems it was just an f-up from factory.

what stinks for me is both resellers were happier to supply the odd spare part and then blame the riders and mechanics than actually find out what the problem is.



Another note of importance is that there is no problem with sigma/yoyo for other bikes. This bolock with the washer thickness was only dropped with the SV clutch. Have heard of no problem with the rest.

Sigma dont sponsor me or Steve, we purchase our clutches. I havent seen any wear issues on any of the clutches we have fitted other than on Steve's tuned bike and one other tuned bike.

So i can only comment on the personal experience I have had with using the Sigma and the service Neil has given us which has been 10/10. Nothing wrong with that.

[yorkie_chris]

My mistake, I assumed you would not put a companies stickers on your bike for fun

No i put the Sigma sticker onto my bike to advertise that we use and sell them. So we do get a benefit from advertising the fact. Plus it does match the colour scheme quite well!!

I also sell other makes of Slipper but prefer the Sigma item and the back up we have had in terms of setup.