| Specification | Value |
|---|---|
| Production Years | 1989–1990, 1994–1998 |
| Engine Type | 800cc Liquid-cooled 45° V-twin |
| Final Drive | Shaft Drive |
| Oil Type / Capacity | SAE 10W-40 (3.5 L) |
| Spark Plug | NGK DPR7EA-9 |
| Battery | YTX12-BS |
Engineering Highlight: The Integrated Trunk Concept
The Honda PC 800 Pacific Coast (RC34) holds a unique place in motorcycling history as the first major production motorcycle designed specifically by Honda Research of America (HRA) to target the “white-collar” non-motorcyclist. Its most radical engineering feature was the integrated, top-opening trunk that completely enclosed the rear wheel. Unlike traditional panniers, the PC 800’s trunk functioned like a car’s boot, capable of carrying two full-face helmets or two grocery bags, emphasizing utility and weather protection over raw performance.
Technical Overview & Performance
Underneath the extensive plastic bodywork—designed to minimize maintenance and keep the rider clean—lies a robust 800cc V-twin engine derived from the Shadow line but heavily modified for touring. The RC34 features hydraulic valve adjusters and a maintenance-free shaft drive, making it one of the most user-friendly motorcycles ever produced. While its 57 horsepower output was modest, the flat torque curve and low center of gravity provided a stable, car-like composure on the highway.
Maintenance Guide
Lubrication System
For optimal engine longevity and smooth shifting of the integrated gearbox, MotoSpecsLab recommends SAE 10W-40 oil. Ensure the oil meets API SG or JASO-MA standards to protect the wet clutch system. The total refill capacity is 3.5 Liters.
Electrical & Ignition
The PC 800 utilizes a 12V system powered by a YTX12-BS battery. For ignition, the factory recommends NGK DPR7EA-9 spark plugs, gapped to 0.8–0.9mm. Accessing the plugs requires removing specific body panels, a task that demands patience to avoid breaking the plastic tabs common on aging RC34 units.
Tires & Chassis
The Pacific Coast uses a unique tire combination that contributes to its stable handling characteristics:
- Front: 120/80-17 61V (Pressure: 2.25 bar / 33 psi)
- Rear: 140/80-15 67V (Pressure: 2.5 bar / 36 psi solo; 2.8 bar / 41 psi loaded)
Expert Verdict
The Honda PC 800 RC34 was decades ahead of its time. While its “appliance-like” aesthetic was polarizing in the early 90s, today it is celebrated as a pinnacle of ergonomic engineering and reliability. For the modern collector or commuter, it offers a level of weather protection and storage that few modern bikes can match without bulky aftermarket accessories.
Frequently Asked Questions
How do I access the engine for maintenance?
Most routine maintenance points are accessible via removable panels. However, for major service, the large fairing sections must be removed carefully. Always use a plastic pry tool to avoid cracking the ABS plastic.
Is the PC 800 suitable for long-distance touring?
Absolutely. With its shaft drive, hydraulic lifters (no valve adjustments needed), and massive storage capacity, it remains one of the most maintenance-free touring bikes ever built.