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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.

Energy One BTX-11 ⁴⁾	Soaking the plates in oil ⁵⁾

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⁾