The Legendary Honda RC30

Honda’s all-time number-one hit is just as good now as it was when it was new.

I am in the fortunate position of having ridden more bikes than I could possibly remember—and there are some beauties in that lot—and also of having owned many nice machines, one of which I still own.

A Blind Freddie could have recognized the RC30 as an instant classic from the moment it made its public bow. It’s a prime example of what Honda does from time to time; create something with a single purpose in mind and spare no effort or expense in doing so. In this case, the single purpose was to win the inaugural World Superbike Championship in 1988, which it (narrowly) achieved thanks to Fred Merkel’s skill and a small degree of luck.

But a win is a win, and a championship—a World Championship, thank you—is even better, and Honda’s svelte V4 had earned its stripes in consummate fashion. Just to rub it in, Merkel swept to a second consecutive (and far more dominant) World Championship the following year on a developed version of the same machine. 

But the V-twins were coming, and perhaps with rules tweaked to favor, or at the very least encourage, the European factories, Ducati began its rise to supremacy, something that miffed Honda into a severe re-think of the RC30, resulting in the fuel-injected RC45.

But that is another story, and here we shall concern ourselves with a period in history that began in 1987 when the first batch of VFR750R Hondas was released to a slathering audience in Japan.

The 'Before' Machines

By 1984, Honda was beginning to take serious interest in the Endurance Racing concept that was sweeping Europe, as well as the blossoming British TTF1 series, and their RS750R, based on the VF750F used in American Superbike racing, was the result. The Endurance racer developed into the RVF750, with 135 horsepower on tap, and with Wayne Gardner in the saddle, brought Honda a cherished victory in the Suzuka 8 Hours in 1985, plus top spot in the World Endurance Championship.

Honda was winning on the racetrack, but, still, sales of the road-going V4s were sluggish. In an effort to gain some reflected glory from the numerous championship wins, the VFR750F was created—a far better machine than its predecessors but still under intense competition from its Japanese rivals—which soon gave way to a completely redesigned model with a much lighter engine with 180° crankshaft (supposedly producing improved exhaust scavenging) and gear-driven camshafts. The chassis was all-new too; a box-section aluminum frame and similar swingarm; the machine now weighing it at a very competitive 436 pounds.

Gestation period over

Which more or less brings us to the point of the story—the VFR750R or RC30. While the RC30 was technically based on the latest evolution of the VFR750F, the resemblance was superficial, the attention to detail reflecting the fact that every RC30 was built by a small team of dedicated technicians at the Honda Racing Corporation.

Beginning with the powerplant, the major difference was the reversion to a 360° throw for the crankshaft, upon which sat titanium con-rods—the exotic material also used for the valves. Camshafts ran in needle-roller and roller bearings, acting directly on the valve stems; the elimination of rocker arms allowing for a more compact cylinder-head casting and for the inlet ports to be realigned by tilting six-degrees higher to produce a more direct path from the carburetors to the combustion chambers. The standard 38-degree included angle for the valves was retained. No oil cooler was fitted, but oil temperature was reduced by running engine coolant through a small circular radiator mounted adjacent to the oil filter. Two large radiators (one with fan assistance) carried the engine coolant.

Chassis-wise, the RC30 was closely based on the aluminum twin-spar RVF750 with what Honda called the Diamond frame concept which used the engine unit as a stressed member. The RVF had made good use of the Elf-patented single-sided swinging arm (Honda paid a royalties to the French fuel company for each item produced) with the wheel retained by a single nut which allowed rapid wheel changes where the rear sprocket and chain remained in place, and the RC30 retained this feature.

Interestingly, even though the wholesale transition to front and rear 17-inch tires was under way (which would subsequently render the formerly universal 18-inch hoops obsolete and largely unobtainable), the RC30 employed an 18-inch rear with a 5.5-inch rim, supposedly as it offered marginally better wearing qualities, another crucial factor in Endurance racing. The rear-brake setup incorporates a linkage connecting the caliper to the chassis, claimed to reduce “squat” under braking and acceleration.

Up front, provision for rapid wheel changing was also evident. Each fork slider actually swivels inside the top mudguard mount to allow the calipers to clear for easy servicing, while a single nut on the bottom of each slider operates a hinge that allows the wheel to simply drop out.

The attention to detail is everywhere, such as the quick-release axles for fast endurance-racing wheel changes.

A shapely aluminum fuel tank with a quick-fill cap was used and each fiberglass fairing was hand-laid and finished. The RC30 bristles with little touches that show the extent of the thinking behind it, such as the small crease in one of the exhaust pipes to clear the rear chain, this necessitating a very slight difference in jetting for the respective cylinder.

For 1987, a batch of 1000 RC30s was built for the Japanese market, but these were severely detuned, producing just 77 horsepower, with small-diameter headlights and black mirrors. This production completed the required homologation for the 1988 Superbike World Championship. When the RC30 went on sale in the UK in 1988, it was listed at a staggering £8495, while American Honda asked, and received, $14,998 for the examples that were originally earmarked for the American market. In all, 4885 editions were created for international consumers between 1987 and 1992.

For racing, HRC produced a kit comprising an exhaust system, radiator, transmission set, different gearing, handlebars, steering damper, front and rear race wheels, different brake calipers, axles and carburetor jets.

A Collectors’ Item

Unsurprisingly, there is now a healthy world-wide trade in RC30s, with an original 1988 model selling for $121,000 at the Mecum Las Vegas auction last year—a new world record.

But it’s worth knowing what to look for and how to identify the various models. The original JDM (Japanese Domestic Market) models are very detuned with modified ignition, carburetors, exhausts and rev-limitation. Bikes that have been laid up for some time tend to develop fuel leaks, which are caused by the hardening of the many tiny rubber O-rings in the carburetors and fuel system. This means fuel dribbles over the engine and settles in the belly of the fairing—a rather unsatisfactory situation.

Australia/Europe models are distinguished by the VFR750R designation on both sides of the seat cowling. British models have larger diameter headlights and mirrors are finished in white. In 1990, the U.S. market received models with about 86 horsepower on tap for the 49-state model (which features a “0” in the eighth position of the VIN). The California-only model (which is identified by a “1” in the eighth position of the VIN) was even more restricted and had a low lift cam and softer valve springs and a 12,000-rpm red line, while the rest of the U.S. models ran to 12,500 rpm. The U.S. version is also distinguished by the “RC30” decal on the tail. There was also a handful of RC30s produced for the UK market in 1990, the model enjoying phenomenal popularity in the light of the continuing successes at the Isle of Man TT.

Of course, many (perhaps the majority) of RC30s were raced, and some converted back to road spec once their track days were over. Warped front discs are fairly common where bikes have been subjected to competition. The fairing appears to contain two slightly different shades of red, and many collectors make the mistake of having this repainted to match the color in the lower section. However, the truth of the matter is that the top section is actually a decal and was used by Honda to guard against having paint chipped by the three Dzus fasteners.

Just Like Joey Dunlop’s

To ride a Honda RC30 is about as rare as meeting Michael Jordan, to spend a few weeks as the custodian of such a machine, even more so.

That’s what happened to us last month when American Honda arranged for Cycle News to have a few weeks on this stunning 1990 edition, resplendent in a Joey Dunlop color scheme that is so close to the colors he raced, you’d be very hard pressed to find a flaw.

This RC30 is owned by a gentleman in Southern California, a Honda enthusiast who is clearly more trusting than I am, but I wasn’t about to say no to a few rides on perhaps Honda’s greatest production street bike ever created.

Honda RC30 ridden by Joey Dunlop, Isle of Man TT

This one was stock aside from the race exhaust and different jetting to suit, although details are rather sketchy. It sure feels like it has more than the 85-ish horsepower the California models came out with and is jetted so beautifully it feels like the throttle is almost an extension of my muscle memory.

It’s how some things really were better back in the day. Compared to a modern bike, one that has to comply with untold emissions regulations that ruin a nice throttle response, the RC30’s initial delivery of the power is velvety smooth. Power is delivered so seamlessly and to a chassis so compliant, you start building up speed far faster than you’d think for a 30-year-old motorcycle. First gear is exceedingly tall, with second-third-fourth gears very close together before spacing out again for fifth and sixth. Yet the gearbox is so light and direct, it’s right up there with the best gearboxes I’ve ever used—new or old. Remember, there’s no electronics working here. Just refined mechanical excellence at work.

The svelte chassis simply decimates corners. With a weight bias heavily leaned towards the front and that 18-inch rear wheel matched to the 17-inch front, you can easily fall into the trap of taking multiple stabs at a corner, such is the sheer turn speed of the chassis.

You can change lines on a whim—the RC30 will simply abide by your thoughts almost before they become actions. It’s not 250cc Grand Prix levels of agility, but for a four-stroke, it’s one of the very finest I’ve ridden when it comes to letting the rider pick and choose lines at any point while riding.

The RC30 is an utterly incredible machine. It’s always nice when you meet a hero and they are as cool as you’d hoped, and the RC frankly surpassed my expectation. The RC steers better than most modern bikes and has a presence they could only dream of, and I’m honored that Jon Seidel and the crew at American Honda organized this test for me.  — Rennie

V1 MOTO has this rare and collectible 1990 Honda RC30 available for sale.
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