STM Slipper Clutch

Finally got the unit installed.... Build- Exceptional. Machining is super clean, and as I have said a couple of times, to bad it is getting hidden inside. Pulling her apart

:thumbup :corn

I had my plates soak for 3-4 days

Clutch laid out prep'd for assembly...

Had to bring the laptop down. Vahakn's extensive how to killed it for us. Thanks V! The install is not super hard but needs to be done properly.

Sasan stacking clutch pack for install.... Sasan from LA Yamaha is the only mechanic I have had lay hands on my bike.He is a rider first mechanic second. Dude used to drag holes through his fairings on his 954 at Willow. Understands my desire for things to be proper. Also magical at mounting wheels. No metal touched my BST's on install :) I had to find a way for me to mod my bike more affordably. Cutting a mechanics hourly out of the loop made sense... I have done all the work on my bike, and truthfully it has been the first time. I have never done ANY work on a bike before this bike. How much stuff I have ****ed up. Iamgine installing and un-installing your forks 4 times in a row because your a dick and cant read a factory service manual, and you never done it before... i am munkee. Doing your own work is very rewarding. Frustrating, yes. But in certain cases I will have defer to better tools and a bike lift to make the surgery go with no hitches :crash

OE unit pulled... I found this to be my favorite part. I got to see the direct result of my driving and launches. Plus the history of the bike via the clutch plates. I have never pulled a clutch but I got the idea of brake pads meaning that is what the clutch plates were of sorts. So inspection had very good and even wear. Color (inidacator of rude heat cycling) also was good. I guess blueish is not desirable. Also look around the clutch were the plates would move. Again if there is weird shit, scoring, cuts or grooving, your girl be getting tweaked on too hard homey...:crash or it would make sense right... again Im not an expert.

STM unit put in... Just because...... :crash I did realize how nice a new clutch basket would be to adorn the new slipper. Guys when it is said it never ends, I as admitted bike gear whore, it never ends. I been on an oatmeal diet saving for my new forks and paying off the BST's

When putting in the bearing into its new cup~race Sasan made me proud. Threw the bearing into a freezer in the back office. Followed up with light heat on the beautiful anodized cup, and light action with a 1 ton press... a pefect install

What up bruddah cuz!!?

Primary seat with provided tool, and torque. oop no pic

:2bitchsla

Beautiful...

Tip- Getting the linkage arm to seat in the grooves isnt so hard. Guiding the arm into the stay is. We elected to put some Bel Ray grease into the bearing to get it to 'sit up'. Worked great.

I had my bolts galvanically seize to my rivnuts... Couldnt put on my Magical Racing M1 Hugger, or take my Dynomite one off. :( Sasan did it while I was away. We decided to go with some trick ones made by Aprilia. Has a works looks and a better option then the stock shit. The end result...

Thought you got the money shot.... Naw, here it is.

Modulation- Wow... I didnt realize the OE unit had such a progressive feel. The STM diaphram spring is linear and consistent in pull. It is harder but not so much so that its to much. It feels much more like a hydraulic unit now. I dont know if I like this. Some feel or I should say sensitivity is gone. Conversely feel is very solid. What I lost slightly in feel I gained in very clear and solid pulls. I was suprised. Launching- Also another wow. Didnt expect this to change. Clutch has a different friction zone. Its later, kinda reminds me of my buddies stunting clutch. The bike does launch differently now. I dont want to get into it as I'm not really qualified to explain why but it is a positive feeling. Confidence has gone up here. Downshifting- Whoa.... pretty cool stuff here people. I could handle my back getting light, is fun, but you know what happens when fun gets to much. This bike loves to get light there. I ride fairly mellow so this never was to much an issue, but track speed dynamics and even flowing canyon rides with tight 1st, 2nd gear corners, smooth chassis is paramount. What I never liked was my 'lack' of ability to stay ultra smooth (not upset my chassis). This clutch helps. Blipping is not gone but is almost not needed. Remember slipper clutch does not mean freewheel. There is a diaphram springs that can be adjusted for less engine breaking (I have the 40kg, lightest (for street)), and there are two heavier options. This clutch makes the bike so much smoother under downshifting. I got out a little bit yesterday and went after it... very cool. I have always been heavy with engine breaking... I kinda of miss the back pull of it, but I know this is really not desirable in the big picture. Smoothness is. Bike is much more fluid. Really is cool. Chatter- There is chatter. In a way kind of cool. Sounds like a dry clutch (baby style) is buried deep in my girls belly. FWIW, I think the clutch is machined to very clean tolerances therefore I feel it is fair to say the plates when disengaged move easier. My hypothesis. In time apparently it will go away. Also I might ad it is hard to hear unless you go looking for the noise. So- Do you notice it on the street. Absolutley. The clutch has a subtle but different launch. The diaphram style spring provided a different friction zone. Requires adjusted clutch modulation at first. Very positive launches. What is does for smoothness is pretty cool. This is something I need to get on the track. Smoothness matters everywhere and I notice it here. Nothing to radical though. Just positive feeling. I know you guys get that carving feeling when your riding well. No upsets just flow. This type of clutch seems to really promote that. lates :beer :bandit

Nice write up Dylan...looking forward to doing the same mod soon... Ohlins fork first then my STM...:D Gawd Damn your R1 is clean...one of the best '02-'03 I've seen...:yesnod

Nice write-up Dylan! You lucky sunofabiatch!! :) So what comes after the forks?? Why don't you save some more and opt for some marzocchi units?? :) :cash

Thanks guys.... :) Forks... I would prefer to get some well sorted Ohlins forks. I would like to spend more energy on the swingarm, and the subframe. I have an NCR/poggiopolini hand made 'one off' titanium subframe. For that I will need another tail section, and undertray to do it right. 1500 easy right there. But I will have truly 'works' parts. The Harris swingarm will be coming soon Marzoochi units. My chassis guy had little good to say about them... but that is him. Really the only fork that would make me happy is the Gas units from Ohlins, but 8k is more then I have. R/T will be good. I will actually prolly pull the Ohlins internals and put in some od Dave Hodges machined pieces of love... The best part of the Ohlins forks are not the internals IMO. Right now I want to get the electrical done and then ride the **** out of her.... I need to get my next mod the steering damper done. You guys will like it. Because of my adjustable triples nothing offered will mount. So I am doing an under the triple style. Have the Ohlins 68mm shock. Have to fab a bracket, and get the fork clamp and I am dialed. Also BST is sending me a new rear wheel in return for mine. They want it for testing. I'll post pics when I get it. :) Originally posted by AnonymousR1 Nice write-up Dylan! You lucky sunofabiatch!! :) So what comes after the forks?? Why don't you save some more and opt for some marzocchi units?? :) :cash

Good job mang - I love these write ups w/ quality pics.. :)

Another thanks, this is a mod that is in the back of my head and is nice to hear your experience with it! You will have to write up your track impressions.

Definitely... I will say guys that it has brought out some faults of my own. Being the OE clutch is generous, lets you shift thoughtlessly. My point, I have discovered I modulate my clutch in a way that the slipper doesnt like. I have a tendency to blip hard and shift a little out of synch... Make sense. Damn thing is making me have to get my shifting more synched. The result of not shifting right has a peculiar release that feels shitty. I believe it is from my odd shifting synch. If it sounds like I am over anylizing it I am not. I have discovered my shifting needs some attention...lol Love the slipper. I find myself using my gear indo way more as it hides the torque difference in each gear. It is amazing to go from 4th to 1st and it be so smooth.