Overview

Compu-Fire Starter Pinion Gears

Compu-Fire starter pinion gears and gear sets are heavy-duty aftermarket upgrade components designed for Harley-Davidson© Big Twin motorcycles to improve starting reliability and reduce mechanical failures.

Key features and specifications:

* Gear configuration: Typically features a 10-tooth pinion gear paired with an 84-tooth starter ring gear (providing an 8:44 or modified ratio)
* Increased torque: Delivers 15 percent more starting torque compared to stock gear ratios (such as factory 9:66 or 10:102 setups), helping turn over high-compression or modified engines more easily
* Material strength: Manufactured from 8620 carbonized/hardened steel to resist wear, pitting, and teeth stripping
* Problem solver: Engineered to replace weak stock or late-model gear setups (like prone-to-breakage 10-tooth to 102-tooth factory configurations) and reduce gear tooth breakage
* Compatibility: Designed to work with OEM-style clutch baskets across various Harley-Davidson© Evolution Big Twin and Twin Cam models (generally spanning years like 1990 through 2006, depending on the specific kit number).

Applications

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