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Compu-Fire Starter Gear Sets

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Compu-Fire 10/84 starter gear sets are aftermarket transmission and starting system upgrades designed primarily for Harley-Davidson© Big Twin motorcycles.

Key fe

Compu-Fire 10/84 starter gear sets are aftermarket transmission and starting system upgrades designed primarily for Harley-Davidson© Big Twin motorcycles.

Key features and specifications

* Gear ratios: Includes a 10-tooth pinion gear and an 84-tooth starter ring gear
* Torque increase: Lowers the gear ratio to produce 15 percent more starting torque than stock setups (such as standard 9:66 or 10:102 ratios)
* Material: Constructed from 8620 carbonized (hardened) steel for enhanced strength, wear resistance, and long service life
* Durability: Replaces weaker or fragile factory ring gears (especially late-mod

Compu-Fire 10/84 starter gear sets are aftermarket transmission and starting system upgrades designed primarily for Harley-Davidson© Big Twin motorcycles.

Key features and specifications

* Gear ratios: Includes a 10-tooth pinion gear and an 84-tooth starter ring gear
* Torque increase: Lowers the gear ratio to produce 15 percent more starting torque than stock setups (such as standard 9:66 or 10:102 ratios)
* Material: Constructed from 8620 carbonized (hardened) steel for enhanced strength, wear resistance, and long service life
* Durability: Replaces weaker or fragile factory ring gears (especially late-model 102-tooth ring gears prone to tooth breakage under heavy loads or high-compression engines)
* Compatibility: Designed to work with OEM-style clutch baskets (fitment varies by year ranges, such as 1990-93, 1994-97, and 1998-2006 Big Twins)
* A typical Compu-Fire 10/84 set generally includes:
-- 1 x 84-tooth starter ring gear
-- 1 x 10-tooth pinion gear
-- Mounting hardware (such as socket head cap screws)