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Sportster Motorcycle Transmission, Clutch, Primary & Secondary Drive Transmission, Clutch and primary or secondary drive problems, advice, and/or how tos.

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  #1  
Old 28th May 2008
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Default Blown a clutch? Please give details....

Lately it seems we are seeing a lot of post about clutch issues. A few short years ago you hardly ever heard anyone posting about their clutch slipping or complete failures. So what is causing the increase in clutch issues on our beloved Sportsters? Is it SportTrans fluid is no longer available and the new Formula+ or other alternatives people are now using is causing the clutches to slip? Was there a redesign? So I am going to ask a few questions to help us isolate if their could be a common cause. If you have ideas for additional questions to help isolate the cause, please PM them to me and I will had them to the list.

1. Year of bike
2. Model (1200/883/other)
3. Miles on clutches?
4. Fluid used when slipping of clutch began?
5. How many miles on that same fluid?
6. Did you perform routine adjustments per the service/owners manual?
7. Your riding style: Aggressive, semi-agressive, normal, and easy going
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  #2  
Old 8th June 2008
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Default

My clutch went this spring. It's at the indie right now.
I will add specific details with what went wrong when I see him on Monday.
Somthing broke and chewed up the clutch.

2006 1200C
25000kms
Syn from HD same as whats in the engine
3000kms on the fluid (was changed in the fall)
I adjusted the clutch last at about 15000kms
Riding style - semi agressive

Of course the warranty expired in April 08, started experiancing problems in May.
Rivets sheared off
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  #3  
Old 8th June 2008
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Default

I'm installing an Energy One kit tonight, at 11678 miles on my 2006 XL1200C. I started using Amsoil MCV in the gearbox quite some time back. My style is aggressive, and the bike has seen a few nights at the drag strip. I adjusted the clutch per the service schedule, but noticed it starting to lose its grip last summer. Since then, I've put a max of a thousand miles on the bike.

Can't remember when I last replaced the primary case fluid, but I'd hope that I would have gotten to it at the 10,000 mile service. Fluid drained tonight was shimmering from metal dust, though otherwise appeared to be in good condition. Guess I may have caught this thing in the nick of time.
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Old 8th June 2008
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Default

I am on my third clutch and it has 5% slip according to the dyno. I have always used sport trans up till this year when the dips!%$# stopped making it. I keep my chain set to spec and it is stretched to the max(time for a new one). my theory, we are trying to make more power than we should for the stock clutch body. the last two of mine have been barnett kevlar clutches with heavy duty spring. I do romp on my baby quite a bit. I am buying a Bandit clutch this winter most likely.
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Last edited by rottenralph; 8th June 2008 at 14:56..
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  #5  
Old 8th June 2008
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Default

1. Year of bike - 2007
2. Model (1200/883/other) 883-> 1200 conversion
3. Miles on clutches? -> Started slipping after conversion ~ 5500 miles
4. Fluid used when slipping of clutch began? Stock (Sport Trans?)
5. How many miles on that same fluid? Never changed as far I know.
6. Did you perform routine adjustments per the service/owners manual? Probably not.
7. Your riding style: Aggressive, semi-agressive, normal, and easy going - Probably in the aggressive category?

Not sure if I'm really a good candidate to get information from, but there you go. The clutch slipped after the conversion (883->1212 NRHS, Stage 2 883 Heads, 497 cams). Replaced the stock clutch with a Barnett Scorpion...now with over 25,000 miles on this clutch, I just can't IMAGINE having an issue with it. Well, besides the incredibly INSANE lever pull...
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  #6  
Old 8th June 2008
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Default

Quote:
Originally Posted by Lynk View Post
I'm installing an Energy One kit tonight, at 11678 miles on my 2006 XL1200C. I started using Amsoil MCV in the gearbox quite some time back. My style is aggressive, and the bike has seen a few nights at the drag strip. I adjusted the clutch per the service schedule, but noticed it starting to lose its grip last summer. Since then, I've put a max of a thousand miles on the bike.

Can't remember when I last replaced the primary case fluid, but I'd hope that I would have gotten to it at the 10,000 mile service. Fluid drained tonight was shimmering from metal dust, though otherwise appeared to be in good condition. Guess I may have caught this thing in the nick of time.
Well, my clutch looked okay when I took it out of the basket tonight. Then I noticed that the friction plates in the middle of the pack had some gouging. Seems that one of the rivets in the spring plate broke, and the two pieces were ripping up the pads.

Oh well. Seeing how much meat was left in that pack, I'm convinced that the OEM clutch isn't designed for anything more than a pipe and airbox. If you're going to upgrade, price in a performance clutch pack.
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  #7  
Old 8th June 2008
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Default

1. Year of bike - 2002
2. Model (1200/883/other) 883-> 1250 Stage II conversion
3. Miles on clutches? -> Started slipping after conversion ~ 25500 miles
4. Fluid used when slipping of clutch began? Stock (Sport Trans?)
5. How many miles on that same fluid? 10000.
6. Did you perform routine adjustments per the service/owners manual? Have not adjusted the clutch cable but changed fluid.
7. Your riding style: Aggressive, semi-aggressive, normal, and easy going - Semi-aggressive.

Took the bike to my indy Big-V American Motorcycles yesterday to install the new clutch I got from NRHS Performance. I putting in a medium spring plate and have added an EZ-Puller to the clutch.

I am using DP-Brakes clutch plates and the rest of the parts are from Drag Specialties.

I can't justify spending $500.00+ on a Barnett Scorpion.

I should have the bike back on Thursday or Saturday.
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Old 8th June 2008
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Quote:
Originally Posted by Lynk View Post
Seems that one of the rivets in the spring plate broke, and the two pieces were ripping up the pads.
This is exactly what happened to mine as explained by my Indie over the phone.
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Old 8th June 2008
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The stock clutches are weak at best for aggressive riders..........that goes for any bike..........best to do an up-grade to better plates and stronger springs!!
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Old 8th June 2008
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06 1200R
17,500 miles
Amsoil 20w 50 with 1,500 miles since last oil change
I do all my own maintenance. I had adjusted the primary chain, but did not adjust the screw under the derby cover.

The rivits on the spring plate sheared off. I replaced the spring plate with 1 stock friction plate and 2 steel plates. It took awhile to get used to the feel of a quicker clutch, but now I like it much better. It also shifts much better. The old friction and steel plates all looked almost new with no signs of burning or wear.

Here is the link with more details. Take a look at the Energy 1 friction plate, the friction material is off center. I sent it back and did not use it. There is also a picture of the blown spring plate.

http://xlforum.net/forums/s...d.php?t=168162
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