Clutch Disks - Barnett Kevlar or EBC Heavy Duty?

[Lotsokids]

Obviously the EBC is cheaper. Are stiffer springs required with the kevlar disks?

I admit I ride rather aggressively. My current Ferodo disks only lasted about 8 months. 

Your thoughts?

[the fan]

I run OEM drive and driven (friction and steel) in all of my bikes street and race. I do run EBC heavy duty springs but have not been happy with EBC or Barnett fiber plates.

The only exception to this is an 09 GSXR600 that I crew for in expert level racing (WERA) . We run OEM drive plates and Barnett cryo treated aluminum driven plates to reduce mass and minimize power loss. Worked well enough for Rob to win the NC region A superstock (ASS) championship and we never touched the clutch all season. A SS is a 1,000cc class running lightly modified production bikes, Rob won riding his 600 and often holeshot the races.

[Yamifj1200]

Go with 2 stock springs or two stock FJR clutch springs as they are less expensive than the stock fj springs are. I don't know anyone who is using two clutch springs that's having any probelm with enough clutch grip. If your pressure plates are worn out in months your clutch spring is very weak. I would also go back with the stock disks the Barnetts are not highly recommended around here.

Eric M

[weymouth399]

Plus 1 on that

Bob W

[RichBaker]

Double stock FJR springs and OEM plates, one more time....  still have the stock frictions, had to replace 2 steels when I added the 2nd spring.

[andyb]

OEM, all other clutch discs are garbage.

Put enough spring against them that they don't slip, and get on with it.

[Lotsokids]

LOTS of good info, thank you. I'm looking on Ebay right now. You can imagine the coordination of purchasing parts and delivering them to family in the U.S. to bring with them when they visit us in Hungary.

Is this the clutch spring you are talking about?
http://cgi.ebay.com/ebaymotors/NOS-Yamaha-Clutch-Plate-XS-FJ-FJR-1100-1200-1300-YZF-R1-/370436439228?pt=Motorcycles_Parts_Accessories&hash=item563fbb7cbc

Another thing I forgot to mention, as the bike gets hot, the clutch doesn't slip - or very rarely. Does that factor into any of this?

BTW - When the clutch doesn't slip and I crank open the throttle, I'm sure the day gets a little longer because my old FJ is rotating the earth. The fresh carb sync made a big difference. It has VERY smooth accelleration now!

[Harvy]

Nope....that's a plate...
look here:

http://www.fjowners.com/index.php?action=gallery;su=user;cat=19;u=80

Pictures of Randy's measuring of OEM and non OEM springs.


Harvy

[Lotsokids]

Nope....that's a plate...

Yup, I feel stupid. I didn't look close enough.

What about just ordering the FJR spring and doubling it with my current one? I also don't want to buy a clutch set "just because." I'm getting tired of throwing money at this old bike. The problem is that if it IS my clutch disks, then I'll have to wait until next February until I can get any more parts. Decisions, decisions...

Anyone have a Yamaha part number for an FJR clutch spring?

[Flying Scotsman]

LOTS of good info, thank you. I'm looking on Ebay right now. You can imagine the coordination of purchasing parts and delivering them to family in the U.S. to bring with them when they visit us in Hungary.

Is this the clutch spring you are talking about?
http://cgi.ebay.com/ebaymotors/NOS-Yamaha-Clutch-Plate-XS-FJ-FJR-1100-1200-1300-YZF-R1-/370436439228?pt=Motorcycles_Parts_Accessories&hash=item563fbb7cbc

Another thing I forgot to mention, as the bike gets hot, the clutch doesn't slip - or very rarely. Does that factor into any of this?

BTW - When the clutch doesn't slip and I crank open the throttle, I'm sure the day gets a little longer because my old FJ is rotating the earth. The fresh carb sync made a big difference. It has VERY smooth accelleration now!

Your picture is a plate not a spring

[Flying Scotsman]

Here is one on ebay with some used parts.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=300485731028&ssPageName=STRK:MEWAX:IT

[racerrad8]

LOTS of good info, thank you. I'm looking on Ebay right now. You can imagine the coordination of purchasing parts and delivering them to family in the U.S. to bring with them when they visit us in Hungary.

How about you send me an email and I will send the parts to you in Hungary. I have the clutch springs, O.E. frictions, steel floating discs, and all of the other parts you will need to get it fix properly. Not only can I save you time, but money as well over eBay and most dealers.

Here is a comprehensive write up in regards to your clutch: http://www.fjowners.com/index.php?topic=1808.0

http://www.fjowners.com/index.php?topic=69.0
Randy - RPM
rpm@swaybar.com

Plus, I could include the valve cover grommets you need as well in the same box...

[Yamifj1200]

Yup, I feel stupid. I didn't look close enough.

What about just ordering the FJR spring and doubling it with my current one? I also don't want to buy a clutch set "just because." I'm getting tired of throwing money at this old bike. The problem is that if it IS my clutch disks, then I'll have to wait until next February until I can get any more parts. Decisions, decisions...


Randy can hook you up with all the parts you need and at great prices. Look at it this way, no matter what you put into the FJ its a hell of a lot less than the cost of new bike.

Eric M

[andyb]

http://www.fjowners.com/index.php?topic=1808.0

Read that, twice.  Should answer every question you ever had and ever will have on an FJ clutch (until you get to sliders and lockups and insane stuff, at least).


Take your clutch pack out and MEASURE it.  EXAMINE IT.  You'll need the gasket (order it in advance, it WILL tear if you don't have one!).  The springs can get weak over the years, and they're a borderline design in the first place IMO.  Throwing an FJR spring in to replace the current spring may be enough, doubling the stocker with the FJR spring will also work.  If you intend on doubling springs, the EBC might work for you (not a huge savings though), but with luck an FJR bit could go in alone and provide you all the grip you need.  What's done to the bike?  Making more power significantly?  If you've got good boltons, you may want to go ahead and just plan on doubling things.

Randy's king for parts, though shipping could be high, ask him and find out!

[Lotsokids]

Well, the problem with shipping things here to my house in Hungary is that everything stops at customs in Budapest. They open EVERYTHING and send *most* of it on about a month later. It's horrible. I have bank statements, PIN number mailings, and other flat mail OPENED prior to it coming to my house.

I do have a friend coming in November. Randy - you have mail.