The Honda XBR500 was Honda’s answer to the Yamaha SR500 and one of the most distinctive single-cylinder motorcycles of the 1980s. Powered by Honda’s innovative RFVC (Radial Four Valve Combustion Chamber) engine, it combined classic café racer styling with modern engineering. I owned a black XBR500 for several years and this page combines the motorcycle’s history, technical details and my own experiences of riding and maintaining it.
Honda XBR500 specifications
| Specification | Honda XBR500 |
|---|---|
| Engine | 498 cc single cylinder |
| Power | 44 bhp |
| Cooling | Air cooled |
| Valves | RFVC four valve |
| Starting | Electric & kick start |
| Front wheel | 18 inch |
| Rear wheel | 18 inch |
| Tyres | Tubeless |
| Years built | 1985 onwards |
You can link the technical resource library for this bike here.
Honda’s RFVC engine
One of the XBR500’s defining features was Honda’s innovative RFVC (Radial Four Valve Combustion Chamber)engine. Unlike conventional four-valve cylinder heads, the inlet and exhaust valves were arranged radially around the hemispherical combustion chamber, allowing larger valves, improved airflow and more efficient combustion. Originally developed for Honda’s successful XR off-road range, the RFVC design gave the XBR500 a broad spread of torque and a distinctive, relaxed riding character. The 498 cc air-cooled single produced around 44 bhp, which was impressive for a large four-stroke single of the period, while remaining smooth, economical and exceptionally tractable. Combined with the XBR’s quasi-dry sump lubrication system, electric and kick start, and distinctive twin exhausts, the RFVC engine gave the bike a unique blend of modern engineering and traditional big-single charm that still attracts enthusiasts today.
In everyday riding, the engine felt flexible rather than frantic, happily pulling from low revs with the characteristic thump and effortless torque that only a large-capacity single-cylinder motorcycle can deliver. It wasn’t a machine that encouraged you to chase the red line; instead, it rewarded smooth, relaxed riding and made the most of its strong mid-range performance. That easy-going nature, combined with its distinctive engineering and handsome styling, is one of the reasons the XBR500 remains such a memorable motorcycle to those who have owned one.
Read more about the Honda RFVC Engine here
What was the XBR500 like to ride?
The Honda XBR500 wasn’t a motorcycle that impressed with outright speed or blistering acceleration. Instead, it was a bike that grew on you the more miles you covered. The big 500 cc single-cylinder engine delivered its power in a smooth, predictable way, producing plenty of low and mid-range torque that made everyday riding effortless. Whether threading through town, cruising along country roads or covering longer distances, the XBR always felt relaxed and unhurried.
The riding position was comfortable and natural, giving excellent visibility and plenty of confidence on winding roads. At higher speeds there was the inevitable vibration associated with a large single-cylinder engine, but it was never intrusive enough to spoil the ride. In fact, the characteristic thump from the engine became part of the bike’s charm and reminded you that you were riding something with real character rather than another anonymous multi-cylinder machine.
Handling was stable and predictable rather than razor sharp. The lightweight chassis, 18-inch Comstar wheels and relatively narrow tyres made the XBR easy to place through bends, while the suspension coped well with Britain’s often less-than-perfect roads. It wasn’t a sports bike and never pretended to be, but on a twisty B-road it could make surprisingly brisk progress thanks to its strong torque and forgiving handling.
Looking back, what I remember most is how easy the XBR500 was to live with. It was economical, distinctive and mechanically interesting, with enough performance to be enjoyable without ever feeling intimidating. Even today it remains one of those motorcycles that leaves a lasting impression, not because it was the fastest or the most powerful, but because it had a personality all of its own.
Love for the bike
It was powered by a single-cylinder four-valve engine with the valve stem axes arranged radially relative to the geometric centre of the hemispherical combustion chamber – (Honda’s Radial Four Valve Combustion Chamber, or RFVC) and actuated by rockers and intermediate sub-rockers. Displacing 498 cc (30.4 cu in) and producing 44 hp. The engine, having its origins in the Honda XR series off-road models, featured a “quasi-dry sump”, the bulk of the oil being stored in a separate tank below the seat but a proportion (ca. 0,5 litres) of the lubricant remaining in the crankcase sump.
The steel-braided hoses connecting the oil tank to the engine (clearly visible at the right-hand side of the motorcycle) looked lovely. The two exhaust valves enabled the XBR to be fitted with two separate exhaust systems.
The XBR had both an electric start and a kick start and mine had the kick start linked by a cable to an exhaust valve lifter to reduce cylinder compression during manual engine starting. The XBR had 18″ Comstar wheels and tubeless tyres, 100/90 front and 110/90 rear. The frame was of a single-downtube, dual-cradle design having a box-section swinging arm and conventionally sprung rear suspension and a detachable pillion seat cover to simulate a café-racer look.
I loved my black Honda XBR500. The steel braided external oil lines, twin exhausts and classic styling made it unlike anything else on the road. Unfortunately, while travelling near Ashtead on the way to an airshow, disaster struck when an exhaust valve snapped and destroyed the engine. Thankfully the bike was still under warranty and Honda supplied a complete replacement engine without any argument. It was one of those rare occasions when excellent customer service turned a major mechanical failure into a good memory.