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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Ergonomics/Controls - Seats, Pegs, Bars, Grips, Levers, Pedals » Archive through February 14, 2007 » Reducing clutch lever effort « Previous Next »

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Outlawtigger
Posted on Tuesday, November 07, 2006 - 01:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

is there any way, to reduce the effort needed to pull in the clutch lever, on a xb12?
thanks
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Rarebird
Posted on Tuesday, November 07, 2006 - 02:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What year XB12? I have an 04, and I'd like to upgrade to the latest, reduced pull clutch pieces:

Reduced Effort Clutch Kit
Kit includes a new clutch spring and inner/outer ramps that significantly reduce clutch lever effort. Original Equipment on '06 Twin Cam-equipped models.

36808-05
Fits '99-'05 Twin Cam-equipped models. Stock on '06 Twin Cam-equipped models. MSRP US $44.95

-but, after posting here some time ago, I've still never heard for certain it will work, nor how much work is involved to install it...
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Al_lighton
Posted on Tuesday, November 07, 2006 - 09:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There are a few products out there that will reduce the clutch pull forces.

1) Muller Power clutch- It's a replacement ball ramp assembly with optimized ramps and pull angles. Force reduction in the center of motion is about 40%, more like 10-15% at the ends. I had my doubts about these when they came out, as it is always possible to trade force for displacement, and I figured it would reduce the clutch travel and make finding neutral at traffic lights difficult. While I think there is a small loss of displacement, it isn't significant and the product does work well, all the feedback on the ones we've sold has been positive. you can see it here: http://www.americansportbike.com/shop/cgi-bin/cp-a pp.cgi?usr=51F157363&rnd=4615648&rrc=N&affl=&cip=6 9.160.135.44&act=&aff=&pg=prod&ref=16077&cat=&cats tr=

2) Magura Hydraulic clutch conversion- It consists of a hydraulic master and slave cylinder, but it still uses the ball/ramp mechanism. The slave cylinder is external. By way of the piston area ratios, it reduces force and travel. But since it is a hydraulic mechanism, you don't need to use lever travel up to add cable free play, the "cable" is self adjusting. It minimizes forces by a combination of the force/travel reduction, and also eliminates cable friction. Force at the hand lever due to cable friction is minimal on a new cable, but can be substantial on a 1 year old cable. The hydraulic setup doesn't have increasing cable friction forces over time. It's here: http://www.americansportbike.com/shop/cgi-bin/cp-a pp.cgi?usr=51F157363&rnd=4615648&rrc=N&affl=&cip=6 9.160.135.44&act=&aff=&pg=prod&ref=9154&cat=&catst r=

3) 06 clutch spring- The 06 clutch spring is lighter than the 04-05 clutch spring. There were other tranny changes in 06, and I haven't swapped an 06 spring into an earlier model, so I don't know what the impact is. But I know my 06 Uly clutch pull was a lot lighter than the 05 sitting right next to it. My Uly has a hydraulic clutch on it now, it's like butter with the combination of the two.

There is a product out there called an easy pull or some such thing that essentially is just a ball ramp arm extender. It will reduce clutch force, but it also reduces clutch throw by the same amount, it isn't an optimized ball ramp. I can't say I've heard glowing reviews of that product.

Al
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Henrik
Posted on Tuesday, November 07, 2006 - 02:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I put an '06 Uly clutch spring and a Muller Power Clutch in my S2 and it works just dandy. Clutch is downright "feathery" now : D

2 considerations:

- the Muller arm length allows the bracket holding the clutch cable to rub ever so slightly on the primary cover at almost full clutch pull:

Clutch Pictures

I don't think it'd ever be the source of a problem, but is worth noting in the interest of complete information

- My S2 is still stock and puts - maybe - 55 HP to the rear wheel. I can't vouch for how the lighter clutch spring will stand up to more HP *in my application*, i.e. in a tuber clutch assembly with the spring plate removed. Realistically I should be able to put at least as much power through this set-up as an XB12, but I can't say for sure.

Henrik

(Message edited by Henrik on November 07, 2006)

(Message edited by Henrik on November 07, 2006)
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Reepicheep
Posted on Tuesday, November 07, 2006 - 02:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Al... I bet that hydraulic setup keeps a decent amount of water out of the primary as well...
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