BMW 590cc RS54 Replica Racing Motorcycle
This beautiful BMW racer was built in 2011 by a BMW dealer specialising in the marque's older models. This team has raced their own-designed classic BMWs with some success (see Klassik Motorrad magazine, May 2008 edition); indeed, one built by this dealer won the Netherlands classic racing championship in 2010.
Built with all new parts, the highly tuned R69S engine incorporates an R69S crankshaft and pistons; Schleicher RO160 (Race Only) camshaft; specially made aluminium cylinders; special bearings; R69S cylinder heads modified for twin-plug ignition; 2kg flywheel (6.2kg standard) and a 3.0-litre sump. Overhauled original Dell'Orto SSI 29 race carburettors with adjustable float chambers supply the mixture, which exits via 38mm down-pipes into open megaphones. It is estimated that the engine produces in excess of 50bhp at the rear wheel. The four-speed gearbox incorporates all new bearings in a replacement case. The current final drive ratio is 31/9.
Newly fabricated using BMW factory drawings of the RS54, the frame is part-constructed of oval tubes and is powder coated in black. The front fork is to RS54 pattern, modified to accommodate a new replica Ceriani hub/4LS brake, while the rear hub was specially made to RS54 pattern, complete with left-side brake. The wheels were built up using flanged aluminium 18" rims, which are shod with Dunlop Racing tyres (KR825/KR125A front/rear). Other noteworthy features include a Hoske 32-litre fuel tank, new RS54-type seat, new Kröber rev counter, new Magura handlebar controls, new Bowden cables and numerous nickel/chromium-plated parts. This beautiful machine is presented in race-ready condition, its engine running well.
- The vendor advises us that upon a recent dyno testing the machine achieved the following:
Power: 43 HP at the rear wheel at 6,000 RPM
Torque: 50 Nm at the rear wheel at 6,000 RPM.
The engine was tested no higher than 6,000 RPM. Once the engine has been run-in sufficiently the machine is expected to run well at 8,000-8,500 RPM with an estimated power of more than 50 HP (at the rear wheel).