Warning abit of a long post ahead guys. Again i hope you can help me out. I have had my HYM1100-2008 for a year now so i dont know which parts are OEM etc. Last summer i had the feeling in rare occasions i had a slipping clutch. Now since the season has started the same thing again. Im done with this feeling in my gut that something isnt as it is supposed to be so i started tinkering around. And it is getting worse... Im going to walk you guys through my whole clutch assembly and would like to know your opinion. Basket Basket has no real dents or how its called. Also very little space between the basket and the plates. In my opinion looks good, agree?? Plates My current plate order is like this (from the outside to the inside): OUTSIDE Steel 2.00mm Friction 2.85mm Steel 2.00mm Friction 2.90mm Steel 2.00mm Friction 2.90mm Steel 1.48mm Friction 2.80mm Steel 1.50mm Friction 2.78mm Steel 1.48mm Friction 2.90mm Steel 1.48mm Convex Friction 2.78mm Steel 1.50mm Friction + Steel 2.38mm Steel 2.00mm Convex INSIDE This means i have 9 steel plates and 7 friction plates in my setup. With 1 combo plate that has steel on 1 side, and friction pads on the other. See picture below. Anybody ever saw this before? The most inside plate is also something special. A steel convex ring without and teeth. What the hell is this thing??? Is this a quiet mod that has been installed? Or just something to increase my stack thickness? Also the outside 2 steel (2mm) plates are scratched like hell. I have read that this also isnt really helping the clutch. And this is how all of my plates friction plates look. Do they look worn?? All of the thicknesses vary between 2.78 and 2.9mm. So not to thin right? The total stack height without the convex ring is 35,9mm. And WITH the strange convex ring it is about 38.4mm. Online i read a correct stack height has to be between 37.5 and 39mm. So the height should not really be the problem, agree?? Springs My current springs are only 38.8mm long uncompressed. My guess to little pressure to keep the plates from slipping. The manual states a minimum length of 41mm. The manual is incorrect right? Because these new springs from CNC racing are on the way and they are 40mm brand new. https://www.designcorse.com/products/cnc-h40-clutch-springs-set As a precaution i already orderend a whole new clutch plate set. I can always send it back if i find a cheaper solution before it arrives. https://www.designcorse.com/collect...-sbk-1098-oem-clutch-discs-conduits-and-ducts To summarize i have 3 main questions: - Do you guys see anything special about my clutch assembly on the pictures that could cause the slipping problems? Springs, worn/scratched plates, plate order etc etc. - What is that strange convex ring in the assembly? Quiet mod?? - What is the correct plate order for the new plates that arrive and still keep the clutch quiet? Really hope you guys can help me out!
Interesting post. Never seen anything like that strange toothless convex thing before. Also, never seen the one side plain, other side friction ring. Maybe the lack of stack height due to the “modified” single side friction plate friction material is compensated by the strange convex thing? Basket looks good, as do the other friction plates. I can’t remember the order right now but they are all the same for dry clutches. I assume it’s not a slipper?
No slipper clutch . My dad just confirmed that the strange convex toothless ring is a mod done by "Biggelaar Performance" here in the Netherlands. It reduces the plates smashing the basket increasing the lifespan of the plates and basket. As i can remember this also does the quiet mod. So the friction plates like good to you? If that is the case it could be spring tension in combination with some reduced stack height. I can increase the stack height by replacing 1.5mm steel plates with 2mm ones. New springs en steel 2mm plates arriving tommorow, so i can give that a try before the whole new clutch pack arrives.
All solved guys. The total stack height was not high enough, and because of this the outside pressure plate was touching the inside 37t hub. So to little pressure on the plates. Also the friction plates where abit glazed. So they were roughed up using sandpaper in a hub to hold the plates. Also some steel plates were bend. So they got replaced. BTW. The half friction plate and ring without teeth at the back of the stack are indeed Biggelaar modifications. Reducing basket wear and being a quiet mod at the same time. Cost me 59 euro's to get it all fixed at Biggelaar Special Performance.
Wow, good price... Seems a complicated way to achieve what can be done by simply putting a friction place first though.
