Honda C50 C70 C90 12V Electric Starter Clutch & Chain Kit
Complete aftermarket electric starter drive repair kit for compatible Honda Cub C50, C70 and C90 electric-start engines and closely related horizontal-engine applications. The kit combines the main chain-driven starter components used to transfer power from the electric starter motor into the engine during cranking.
Kit Contents
- Starter clutch / one-way Bendix-style drive assembly
- Large starter sprocket / drive gear
- Starter drive chain
- Two starter-chain guides / protectors
- Associated components supplied exactly as shown in the photographs
OE-Based Specification
The matching Honda starter-drive system uses a 41-tooth starter sprocket and a 25H 62-link starting chain. Honda parts catalogues show this component family on multiple electric-start C50, C70 and C90 Cub variants.
Best Applications
- Honda Super Cub C50 electric-start / Custom and Little Cub variants using the matching GB4 starter system
- Honda Super Cub C70 Custom electric-start models
- Honda C90M / C90 electric-start and C90 Custom models
- Selected Chinese horizontal electric-start engines only where every component matches
Lifan and pit-bike fitment is compare-parts-only. The Honda OE numbers in this listing should not be assumed to identify every Chinese horizontal engine.
Common Faults This Kit Can Address
Typical symptoms of worn starter-drive parts include the starter motor spinning without reliably turning the engine, intermittent engagement, rattling or grinding from the starter-chain area, a stretched or damaged starter chain, worn chain guides, or a slipping one-way starter clutch.
Honda OE / Manufacturer Cross-References
This is an unbranded aftermarket kit. The numbers below are genuine Honda component references used to identify the starter-drive system; they are not claimed to be the manufacturer MPN of this exact aftermarket kit.
- 28101-GB4-701 / 28101-GB4-702 – Honda starting chain, 25H / 62-link family
- 28102-GB4-700 – Honda starter-chain guide
- 28103-GB4-700 – Honda starter-chain protector / second guide
- 28110-GB4-700 – Honda complete starting sprocket, 41 tooth
- 28117-179-710 – Honda starting-sprocket setting plate
- 28120-179-710 – Honda outer starting clutch
- 28125-179-710 – Honda starting-clutch roller spring
- 28126-253-030 – Honda starting-clutch roller spring cap
- 28128-179-710 – Honda starting-clutch side plate
- 91101-179-710 – Honda 10 x 10 starter-clutch roller
- 91102-179-711 – Honda 5 x 11.8 roller
Important Fitment Checks
- This kit is for electric-start engines using the matching chain-driven starter-clutch layout.
- Compare the 41T starter sprocket, starter chain, chain guides and clutch assembly with the photographs before ordering.
- Confirm the starter chain route, crankcase layout and mounting points match your engine.
- Do not order solely from engine capacity: Honda and Chinese horizontal engines were produced with several different starter systems.
- Kick-start-only engines will not accept this kit unless the engine already has the corresponding electric-start crankcase and starter-drive components.
Google Search Terms
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Delivery & Returns
- Free UK delivery with an estimated 2–3 working-day service
- 30-day returns, subject to the item being returned in its original condition