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REF: Primary Drive & Clutch
Aftermarket Clutch Packs
91 and Later Sportsters
Energy One
BTX-11:
9 Kevlar friction plates, 8 steel plates plus a 15% stronger diaphragm spring. 1)
Recommended fluid type:
The use of synthetics is not recommended as they tend to cause slippage. 2)
- Any HD petroleum based, non-synthetic, primary oil, as light weight as possible.
- Or even a good petroleum based motor oil such as 10/40 or 20/50 in weight.
- You can even use ATF Type F or B&M Trickshift.
Installation:
Start with a friction plate and end with a friction plate. 3)
The OEM rivet plate is discarded and not used with this kit.
This kit includes 1 extra friction and steel plate to retain the OEM stack height.
Upgrade Clutch Diaphragm Springs - Pressure
Below are a list of upgrade versions. The 'xx% stronger' are claimed values by the respective vendors. Energy One suggests that if you are using a diaphragm spring of +25% that you should also upgrade your pressure plate to a billet version because they have had issues with the stock cast pressure plate cracking. 6)
L1984-90 Sportster
Barnett Scorpion Clutch Kit 607-30-10084 7)
- MT-33-6 - - - 396lbs (six springs)
- MT-112-6 - - 420lbs (six springs)
- MT-113-6 - - 480lbs (six springs)
1991-later Sportsters
Screamin’ Eagle HD-style Clutch Spring 8)
- 350lbs - 10% Stronger Than Stock 1200 Clutch Spring (SE Clutch Spring 37949-98A)
Energy One HD-style Clutch Spring 9)
- 340lbs - 15% Stronger Than Stock 1200 Clutch Spring (BT15) (% based on '91-'03 1200 OEM spring)
- 380lbs - 25% Stronger Than Stock 1200 Clutch Spring (BT25) (% based on '91-'03 1200 OEM spring)
Barnett HD-style Clutch Spring 10)
- 360lbs MT-81 - 10% Stronger Than Stock 1200 Clutch Spring (502-00-01081)
- 400lbs MT-77 - 25% Stronger Than Stock 1200 Clutch Spring (502-00-01077)
Barnett Scorpion Clutch Kit 607-30-10091 11)
- MT-18-6 - - - 348lbs (six springs)
- MT-112-6 - - 420lbs (six springs)
- MT-113-6 - - 480lbs (six springs)
These springs can be mixed such as: 12)
- 3x MT-18 plus 3x MT-112 = 384 lbs
- 3x MT-18 plus 3x MT-113 = 414 lbs
- 3x MT-112 plus 3x MT-113 = 450 lbs