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Product Name

EnDuraLast II 400 Watt Alternator Upgrade Kit for Airheads 1970-95

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Product Details


Replace the under-performing charging system on your BMW Airhead model with one that produces 400 Watts / 28 Amps and say hello to the 21st century. Imagine… now you can run extra lights, heated clothing, and other accessories without worry, just like on a modern motorcycle!

The EnDuraLast II Charging System uses a BOSCH-style Alternator Charging System with upgraded diode board, regulator, and heavy duty stator and rotor for significantly increased electrical output – all for a very reasonable price!
Select the size range to get the correct kit for your bike. Measure the inside (timing cover side) and outside (stator frame side) diameter of your stator ring with calipers before ordering.

ALTKIT105-2Y: 105mm outside diameter stator (timing cover side) and stator frame side outside diameter is 105mm

ALTKIT105: 105mm outside diameter stator (timing cover side) and stator frame side outside diameter is 107.5mm

ALTKIT107: 107mm outside diameter stator (timing cover side) and stator frame side outside diameter is 107.5mm

Check out the Premium Quality components included in the kit:

Alternator ROTOR
• Designed to replace the original Bosch rotor with modern EnDuraLast technology
• OEM Iron Claw Poles, ETP Copper Wire, Nylon bobbin, double resin coating for insulation protection.
• Computer balanced for reduced high engine RPM vibration reduction.
• Special resin soaking of coil increases life expectancy at high operating temperatures and engine RPM speed
• Brand New - no core charge, no exchange of your old rotor required.
• New Brushes included.

Alternator STATOR
• Premium Quality Stator for use with BOSCH-style charging system: 400 Watts / 28 Amps
• Includes Y-terminal connection

DIODE BOARD (Rectifier)
• Modern Design and Technology
• 8 x 50 amp diodes
• Press fit into a heavy duty aluminum multi-finned heatsink,
• Mounted on a Printed Circuit Board
• Connections use high-temp solder.
• Supplied with 12 gauge wiring harness
• Four new mounting studs with fasteners included.

• New design provides the latest in reliability and endurance under increased current demand and high heat conditions.
• Set at 14.3 Volts but can be adjusted to higher voltage. Adjustable voltage setting allows for optimizing the correct voltage for lower RPM urban operation. NOTE: Must be used with CAUTION as over-charging with high voltage setting will damage electrical components, including your battery! Not recommended to exceed 14.5 V.
• Two- page voltage regulation adjustment guide included.

• All necessary wiring and hardware.
• DVD showing step-by-step installation instructions.
• Printed Installation Guide with full details and color photos.

PLEASE NOTE! Use of ODYSSEY Battery (Dry Cell Design) or LITHIUM IRON Battery with this Charging System is NOT RECOMMENDED or SUPPORTED FOR WARRANTY.

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