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PostPosted: Tue Jan 03, 2017 5:14 pm 
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Location: Long Island , NY, Tampa, Ft laud
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At least for now.. Thanks to BPT7594 forum member I ordered the recommended clutch pads (22535-KVB-900) per his advice to resolve the clutch chatter .I installed them today and from the very start I noticed a much more satin- like smooth takeoff. The acceleration was silky smooth and the deceleration also improved greatly from what I was using (stock Honda pads). If anyone is interested in the install procedure go the the attached link below. If you have any questions feel free to ask. Very happy with these pads for the moment at least and appreciate the help from BPT7594.

https://1drv.ms/v/s!AvV-j2ZMUDvrnRSXsFyPPASrLYNM


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PostPosted: Sun Jan 08, 2017 12:34 pm 
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Great that you like it so far.
Let me explain a little why I think these KVB clutch pads are OK.
The problem with the stock KWN pads and now the K35 pads on the new LED models is that they are TOO catchy, too big friction coefficient, not that they are slipping. It engages too soon. So basically you twist the throttle and the bike moves very close to instantly, which gives you a torquey feel and also it lowers fuel consumption which is huge to Honda. This comes with a price, as you know when a clutch engagesengages sooner than the rpm needed to have torque to move the thing, it slips violently, hence the shudder feel.
The KVB pads, at least to my knowledge, does not engage as soon as stock. They engage at high rpm, but not too high for you to feel like you're riding a 2 stroke. Hence the tamer and smoother acceleration.
Hope that makes sense and I also hope that your problem is solved permanently like in my case. I saw the video, you should get stronger impact gun, because doing that can be damaging to the 22mm and 19mm nuts. I have a clamp thing to remove/install the 39mm nut that holds the clutch assy to the rear pulley. The fact that you used a torque wrench almost gives me an orgasm. Good job.
Cheers.


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PostPosted: Sun Jan 08, 2017 1:58 pm 
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Thanks again, your explanation is well thought out and spot on in my opinion. Yes, the stock pads do grab early and cause a significant chatter in my case. These pads are much smoother and give a satin like take off. Don't care about an ounce or two in saving fuel so these should fill the bill nicely. Your assessment and analysis is perfect and appreciate the tip. I did not realize at the time I had my impact on lowest setting, but even still not sure I understand how it could damage the nuts unless there is a fear of rounding, but that did not happen. Once again, thanks for the tip as it so far proves out to be a successful modification.


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PostPosted: Sun Jan 08, 2017 3:14 pm 
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So, why does the chatter mostly happen from cold and not when the engine.bike had warmed up? It's like that on my bike, may not behave the same on others. Yes, I can get the chatter once in a while once the bike has been running for some time, but mostly it will do it in the first few minutes of riding.

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PostPosted: Sun Jan 08, 2017 3:24 pm 
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NICE! "clutch otter tool" :) where did you get that?

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PostPosted: Sun Jan 08, 2017 5:44 pm 
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I don't know why there is more chatter on a cold driveline. I also noticed its gets better when its warm. May have to do with the compound and coefficient of friction with this material. I am hoping the new pads will improve this phenomena. So far so good..I also noticed a smoother disengagement on making slow turns and nice smooth acceleration through the turn.
FYI Clutch otter etc.. All tools were home made from stuff laying around.


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PostPosted: Sun Jan 08, 2017 7:04 pm 
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Hotter clutch material became soft and slip more. Simple.
Honda style of making clutch is using the catchiest they can. A normal functioning clutch MUST slip to a certain degree, either on a car, bike or scooter.
Yamaha style is different, yamaha clutch slips easily. That's another kind of problem.


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PostPosted: Sun Jan 08, 2017 7:13 pm 
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Another way to approach this clutch chatter is to use heavier clutch springs. But Honda does not have heavier clutch springs in stock that fit the PCX clutch pads, at least to my knowledge. Also using heavier springs will always be a nuisance so I went with the KVB clutch pads. So far so good.


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PostPosted: Sun Jan 08, 2017 7:16 pm 
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I have +23% heavier springs in my stock clutch and it still bites and bogs down on launch without slipping much.
But then again I rode the "angry chainsaw" which has a very high stall on the clutch, and I didn't like it much at all...


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PostPosted: Sun Jan 08, 2017 8:12 pm 
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I use yuminashi torque control variator on all my big bore pcx engines. The clutch I don't touch. Never had any problems.


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PostPosted: Sun Jan 08, 2017 9:15 pm 
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Came to work this morning at just gone midnight after almost 3 days continuous rain (bike kept outside with a cover on and it was wet when the cover went on). Gave it less than a minute warm up and had no clutch issue at all the whole ride. Other times I may get it many times on a ride in/home - it varies :)

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PostPosted: Sun Feb 05, 2017 9:47 am 
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I just did the KVB clutch pad mod while I had the drivetrain apart for the 10K mile service. My PCX has always had HORRIBLE clutch chatter. The Honda shop couldn't fix it. I had to hold the brakes and slip the clutch a lot to warm it up, and it still chattered SOME, even when warm.

Thursday past I serviced the drive train, lubed the clutch driven bearings, which were still in good condition, replaced the belt even though the original met all specs. I have had DR Pulley 15 gram sliders since the week after I bought it. I put them in because it had slower take off and no better top speed than the Elite 110 I traded in.

Anyway, I have the same experience as Easyrider. Glass smooth take offs. Thursday evening I rode it in town about 25 miles. Rode it to work Friday, about 30 miles. Yesterday (Saturday) I rode it 134 miles. I am about to take off for an extended ride in a few minutes. So far, so good. If it works properly long term, I will be one happy camper. This scooter is a perfect fit for me. I, being a mechanic for as long as there has been dirt like tools. I bought the Honda clutch tool, modified a plumbing tool for holding the variator (the locating pins from the clutch tool screw right in) and a strap wrench.

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PostPosted: Sun Feb 05, 2017 10:06 am 
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If this KVB thing turns out to work well, which over here is absolutely the case - I got a guy going on more than 10k km with it, no chatter, should we ask the admin to sticky it? Since clutch chatter plagues all PCX models I think.


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PostPosted: Mon Feb 06, 2017 2:03 pm 
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Location: Austria
Year: 2014 JF57(125)
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Have bought used clutch from Honda SH, the clutch has modified, which became even lighter than those of PCX. Red Malossi Spring used and got good acceleration.


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clutch6.jpg
clutch6.jpg [ 155.77 KiB | Viewed 752 times ]

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YSS G-Euro XL Red shock
Dr Pulley SR2015 13g sliders
Dr.Pulley SP2015-AK sliding pieces
SH Clutch (Facilitated)
Malossi Clutch Spring (Red)

High beam Passing (Flash)
Low beam switch (on/off)
Oxford HG "Touring"

Drive Belt Cover + Swingarm (Matt Black)
Michelin City Grip
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PostPosted: Mon Feb 13, 2017 5:49 am 
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I rode my scooter Saturday. it had been sitting for four days. I cranked it, let it idle for 45 seconds or so to let the oil pressure build up, and took off. Normally the clutch would chatter horribly after sitting that long. It took off smooth as glass, no hint of chatter.

At this point, the mod works better than I could ever hope for. Please mods, do a sticky on this!

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PostPosted: Mon Feb 13, 2017 2:14 pm 
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d.a.rous top two pic have wrong labels
you wrote PCX on SH clutch and vice versa
and seriously all that grinding and only 21g less weight?
but if you said it works I'll take it does


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PostPosted: Mon Feb 13, 2017 2:52 pm 
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Dragon_uk. You're right, I've noticed it later, but since nobody was interested, I left it.
The grinding has unfortunately made the clutch only 21 grams lighter, but in conjunction with Red Malossi springs is the difference compared to the originals, such as day and night. I now start much faster at the traffic light and when overtaking, the scooter gets more sparkling. I drive almost 4000 km with this clutch, I am very satisfied.
This is now the right label.


Attachments:
clutch6.jpg
clutch6.jpg [ 149.28 KiB | Viewed 627 times ]

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YSS G-Euro XL Red shock
Dr Pulley SR2015 13g sliders
Dr.Pulley SP2015-AK sliding pieces
SH Clutch (Facilitated)
Malossi Clutch Spring (Red)

High beam Passing (Flash)
Low beam switch (on/off)
Oxford HG "Touring"

Drive Belt Cover + Swingarm (Matt Black)
Michelin City Grip
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PostPosted: Mon Feb 20, 2017 12:04 pm 
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Rode mine some more over the weekend. I had purposely parked mine under the carport all week instead of in the garage so it would be exposed to outdoor air.

No Chatter!!! I am thrilled!!!! :D

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PostPosted: Sun Jun 25, 2017 4:09 am 
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2 months ago I started to experience this annoying vibration too. This is disappointing. I will see if I can find the replacement clutch pad here..

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PostPosted: Fri Jun 30, 2017 2:56 pm 
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Update. 3 thousand miles later, I am all smiles. If your clutch chatters, do the KVB mod. It is working very well!!!

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