The racing NRs began in 1979 with the 500 cc NR500 Grand Prix racer, whose oval pistons allowed eight valves per cylinder, so that a four-cylinder engine in effect became a V8 with 32 valves and eight connecting rods. Development was fraught with difficulty, prompting some journalists to say that NR meant Never Ready, and the final 500 cc race version developed approximately 130 bhp at over 20,000 rpm but rarely achieved success on the track. The NR750 endurance bike, which appeared briefly in the 1980s, carried on the idea of oval pistons. Each model year has its own page.
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Source Wikipedia: Honda NRLead paragraph, manufacturertier 2Quote, Lead paragraph, manufacturer
The Honda NR (New Racing) is a V-four motorcycle series started by Honda in 1979 with the 500cc NR500 Grand Prix racer which used oval pistons.
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1. Wikipedia: Honda NR
WikipediaDevelopment, oval pistons
This was achieved by designing an oval piston that allowed a total of 8 valves per cylinder, and connecting two con-rods to each piston.
Lead paragraph, manufacturer
The Honda NR (New Racing) is a V-four motorcycle series started by Honda in 1979 with the 500cc NR500 Grand Prix racer which used oval pistons.
Development, Never Ready
prompting some motorcycle journalists of the time to comment that NR meant "Never Ready"
Development, NR750 endurance bike
The oval piston concept continued in the NR750 endurance bike, which made a brief appearance during the 1980s.
Body style, racing-motorcycle: Lead paragraph, Grand Prix racer
with the 500cc NR500 Grand Prix racer which used oval pistons
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