The 748 cc 16-valve gear driven double overhead camshaftliquid-cooled RC24-derived 90° V4 produced at 9,500 rpm for the restricted Japanese model and @ 11,000 rpm elsewhere. It contained race-inspired components. These included such items as titanium connecting rods a first on a production bike that reduced reciprocating weight and, gear driven camshafts. The engine firing configuration was very different from the road-going VFR750F from which it was derived with a 360° 'big bang' crank arrangement instead of the smoother 180°. This feature produced a very broad spread of power and, when coupled to the close ratio gearbox which had an extremely high first gear ratio, made the RC30 untouchable in terms of driveability when on the move. Slowing down was made easier with a slipper clutch, and impressive braking capability for the era. coming down Bray Hill, Isle of Man in the 1992 Senior TT race, on his Honda RC30. While being inspired by the Honda RVF endurance racer the VFR750R instead had its engine based on the 1986-7 VFR750F. The engines are almost identical externally, the only visible differences being in the cylinder heads and the engine side covers. Inside the engine no major parts were identical to the RC24. The clutch, gearbox, crankshaft, oil pump, connecting rods, water pump, pistons, starter clutch, and the entire valvetrain and cylinder heads are specific to the RC30. There were race kits available from HRC Honda. It redlined at 12,500 rpm and had a tested 1/4 mile time of 11.8 seconds.
Suspension and brakes
The RC30 front suspension was made by Showa and had wheel and brake pads that had quick-release mountings. The rear wheel carried a brake disc to the inside and a chain sprocket to the outside of a single-sided swingarm, and attached with a single castellated nut and cotter pin. It was also equipped with fully adjustable Showa suspension which, as it only had a single seat thus focusing suspension performance, gave superior ride and handling characteristics. The engine and low storage position of the fuel in the fuel tank combined to give a low centre of gravity which aided its handling prowess. Further statements of its hand-built quality were shown in a full stainless steel 4-2-1 exhaust system, alloy fuel tank and hand laid fibreglass bodywork. The bike was fitted with a 'Pro Squat Rear Brake Linkage' that linked the rear caliper to the frame via a rose-jointed linkage through the swingarm.
