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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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  #81  
Old 29th March 2022
Bluto Bluto is offline
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Quote:
Originally Posted by brucstoudt View Post
i've seen an XR-1200 motor for sale here.it looked like rubber mount to me?
It is, aside from the rear section the XR1200 frame is very similar to an 2004+ XL. Though so far as the power advantage a lot of that has to do with the airbox IIRC, as it does on a Buell XB.
Anyway as the OP of this thread FWIW 3 years later the XR1200 clutch parts are still working fine...
The XR1200 frame looks like this.

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  #82  
Old 29th March 2022
SonWon SonWon is offline
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Quote:
Originally Posted by brucstoudt View Post
i've seen an XR-1200 motor for sale here.it looked like rubber mount to me?
Money...
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  #83  
Old 1 Week Ago
Tomcatt Tomcatt is offline
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I just installed the XR narrow friction + judder spring and seat. I've put 15,000+ miles on since tossing the grenade plate and installing a Barnett extra plate Kevlar disc set with an E-1 +15% spring and a 7200B release bearing. It's chattered / squealed sporadically the whole time. The XR 1200 parts make a big difference. It now has the clutch feel it always should have had and no chatter. Wish I'd put the XR parts in sooner. Got the parts from Surdyke.
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2017 XL1200C in SE Wisconsin, USA
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  #84  
Old 1 Week Ago
lewk lewk is offline
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Quote:
Originally Posted by Tomcatt View Post
I just installed the XR narrow friction + judder spring and seat ... The XR 1200 parts make a big difference. It now has the clutch feel it always should have had and no chatter. Wish I'd put the XR parts in sooner. Got the parts from Surdyke.
I wanna do the same. Help? What parts did you buy? And these new parts would replace which ones in my existing clutch?

2007 XL1200L here.

Thanx.
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  #85  
Old 1 Week Ago
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by lewk View Post
I wanna do the same. Help? What parts did you buy? And these new parts would replace which ones in my existing clutch?

2007 XL1200L here.

Thanx.
If you have a stock clutch, to replace the grenade plate you need:
1) 37894-02 Judder Spring
1) 37895-02 Judder Spring Seat
1) 37897-02 Friction Disc - Narrow
2) 37913-90 Steel Clutch Plate

I got, and these are, part #'s listed earlier in this thread, I just double checked them for accuracy. I didn't need the 2) steel plates as I had already eliminated the grenade plate when I installed the Barnett extra plate clutch pack. I just replaced one friction with the XR narrow friction and Judder Spring and Spring Seat.

Last edited by Tomcatt; 1 Week Ago at 00:11.. Reason: clarity
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  #86  
Old 1 Week Ago
lewk lewk is offline
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Quote:
Originally Posted by Tomcatt View Post
If you have a stock clutch, to replace the grenade plate you need:
1) 37894-02 Judder Spring
1) 37895-02 Judder Spring Seat
1) 37897-02 Friction Disc - Narrow
2) 37913-90 Steel Clutch Plate

...
Thanx! I'm in the same boat as you: I already eliminated the grenade plate.
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  #87  
Old 1 Week Ago
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by lewk View Post
Thanx! I'm in the same boat as you: I already eliminated the grenade plate.
Then you just need:
1) 37894-02 Judder Spring
1) 37895-02 Judder Spring Seat
1) 37897-02 Friction Disc - Narrow

This is in Sportsterpedia: http://sportsterpedia.com/doku.php/t...ef:priclutch02
You gotta scroll down to find it. It does show which way and where the new plate, spring, and spring seat go in.

Thank Bluto. He did the research to come up with this fix.
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  #88  
Old 1 Week Ago
Andy56 Andy56 is offline
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I used ronnies to just look at the whole XR1200 clutch for comparison before working on my own bikes. The XR1200 parts replace the first fibre plate. So having taken all of the clutch plates out the XR1200 parts go in first.

https://partsfinder.onlinemicrofiche...TCH%20ASSEMBLY

#21, #20 then #23.

If you are modifying a stock clutch refer to the FSM to check plates for wear and make sure they are flat.

I have done two clutches on bikes that had covered around 18k miles and there was very little to no wear on the fibre plates.
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  #89  
Old 1 Week Ago
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Crusty Crusty is offline
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I just checked the price on parts to compare replacing all the plates from an XL clutch with all the plates from an XR clutch. The price was $369.65 vs $374.65 retail taken from the fiche at Green Mount Road H-D.

To my way of thinking that's probably the same cost for the MoFoCo. So why didn't they change the clutch assembly when they came up with the XR clutch? There must be some aspect to the grenade plate design that makes it a better choice.

I'm thinking back to when Accel came out with a stronger Starter Bendix. The original was engineered to be the weak point and be the first and cheapest part of the Starter to fail and also be the easiest to replace. A lot of people wound up trashing their starter motors for a much higher price than the price of replacing a Bendix would have been.

What if the XR setup causes a mainshaft bearing to die much earlier than the spring plate would? I'm not an engineer, but if there's no price advantage to using one design over the other, then there must be a different advantage to keeping the spring plate. They were using both designs during the run of XRs and making the change would have been easy and I doubt it would have cost the factory any increase in price.

That's just something that's running through my mind, this evening.
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  #90  
Old 1 Week Ago
Tomcatt Tomcatt is offline
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Quote:
Originally Posted by Crusty View Post
What if the XR setup causes a mainshaft bearing to die much earlier than the spring plate would?
????? Really?
Have you seen 1 post from someone who has replaced the spring plate (aka grenade plate) with the XR pieces and had a problem? Or, didn't like the result? I haven't. I believe ParrotHead has a bunch of miles on his XR pieces.
The carnage from grenade plate failure has been well documented. That actually COULD cause a mainshaft bearing to die. I preemptively got rid of the spring plate to avoid problems.
A Barnett Kevlar extra disc clutch pack (steels and frictions) was $125 on Amazon. An Energy 1 +15% was ~$35. A NOS FAG 7200B clutch release brg on e-bay was $15. I just spent another ~$60 on the XR narrow friction, judder spring and spring seat. IMHO the results make it money well spent.
Should be good for a lot of trouble free miles vs the OE spring plate and release bearing that have a track record of arbitrarily failing...
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