1986 Suzuki RG400 Gamma HK31A-104834 w/6,781 km (4,205 mi) | Square-4 2-stroke | Japanese GP replica

The Suzuki RG400 Gamma is one of the defining Japanese sport bikes of the 1980s—lightweight, sharp-handling, and powered by an exotic square-four 2-stroke engine derived directly from Suzuki’s Grand Prix racing program.

Unlike conventional inline-four motorcycles, the RG400 uses a compact twin-crank “square four” layout with rotary disc valve induction and Mikuni flat-slide carburetors. The result is a motorcycle with unmistakable sound, razor-sharp throttle response, and the visceral riding experience that made 1980s 2-stroke sport bikes legendary.

This example shows just 6,781 kilometers and presents in overall solid, honest condition with attractive original-style bodywork and factory-inspired graphics. The white/red/black livery is characteristic of Suzuki endurance-racing and period RG Gamma styling from the mid-1980s.

The bike appears fundamentally clean and well-preserved, though it has been unused for some time and should be recommissioned prior to regular riding.

Recommended Recommissioning

• Tires
• Battery
• Full fluid service
• Carburetor cleaning/service
• Fuel system inspection
• Brake system inspection

Condition Notes
Overall solid cosmetic condition with typical age-related wear visible in detailed areas. The bodywork presents well and the bike retains the raw, purposeful feel that defines early RG models.

Ownership & Support
The RG Gamma benefits from strong enthusiast support worldwide, with good parts and technical knowledge still available through specialist suppliers and owner communities.

Useful resources for a future owner include:

• The UK-based RG Gamma forums and owner groups
• Croooober and Yahoo Auctions Japan for used OEM parts
• CMSNL for diagrams and OEM references
• Webike Japan for maintenance and aftermarket parts
• Rick Lance Suzuki Parts for vintage Suzuki support
• Specialists familiar with RGV/RG Gamma crankshaft and 2-stroke rebuilds

Summary

• Legendary square-four 2-stroke engine
• Twin-crank / rotary-valve GP-derived design
• Low mileage example at 6,781 km
• Increasingly collectible Japanese sport bike
• Strong enthusiast and parts support remains available today

Few motorcycles deliver the sound, smell, and mechanical character of a square-four 2-stroke Suzuki Gamma.

Pending shipment from Japan late May for arrival in Seattle, June 2026. Special pre-arrival price includes ocean freight / all USA entry / WA title.