Cling on for dear life is a blog dedicated to CB 750 Café Racers and other cool motorcycle stuff.
Monday, 29 November 2010
1966 - 500 cc RC181
Bore and stroke are 57 x 48 mm for a total capacity of 489.94 cc. Total enclosed valve angle is 75 degrees, symmetrical, so both inlet and exhaust valves are hanging under 37.5 degrees.
There is a six speed gearbox. Power output is 85 bhp art 12,000 rpm, with a redline at 12,500 rpm
A weak point of the RC181 is its crankshaft – the press fit of the crankpins sometimes gives way, causing the crankpins to change position against one another, with disastrous results, a.o. reason of Hailwood's retirement in Monza.