Honda RC110

The Honda RC110 was the Honda racing team's first 50cc Grand Prix motorcycle racer. It was conceived in 1961 and raced during the 1962 season.[3] As the machine was developed during the season, it was renamed the RC111 and most surviving Honda records do not distinguish between the two designations.[2] Despite extensive development efforts throughout the season by the factory, the bike achieved only a single Grand Prix victory.[1]

Honda RC110 / RC111[1][2]

Manufacturer	Honda
Production	1961–1962
Successor	Honda RC112
Class	Grand Prix motorcycle racing 50 cc class
Engine	Four-stroke, single-cylinder, double overhead camshaft
Bore / stroke	40 mm × 39 mm (1.6 in × 1.5 in) 40.4 mm × 39 mm (1.59 in × 1.54 in)
Compression ratio	10.5:1
Top speed	140 km/h (87 mph)
Power	7.1 kW (9.5 hp) @ 14,000 rpm
Transmission	Five-speed manual Six-speed manual Eight-speed manual Nine-speed manual
Frame type	Steel
Suspension	Front: Telescopic fork with central hydraulic damper Rear: Swingarm with hydraulic dampers
Brakes	Front: Central drum Rear: Central drum
Tires	Front: 2.00×18 Rear: 2.00×18
Weight	45 kg (99 lb) (dry) 60 kg (130 lb) (wet)

Background and development

Since their arrival in Grand Prix racing in 1959, the Honda team had impressed everyone with their commitment and professionalism. Buoyed by the team's success in the 1961 125cc World Championship, with booming sales of Honda's 50cc Super Cub road bike and the Sports Cub C110, and the announcement by the Fédération Internationale Motocycliste of a 50cc World Championship for motorcycles for 1962, it was perhaps inevitable that the team would be keen to participate in this new category.

Design

The bike was fitted with an advanced, four-stroke, single-cylinder engine, sometimes described as a shrunken half of an RC145.[1] The engine was inclined at 35°, and fitted with a spur gear driven double overhead camshaft,[1] a four valve head and five speed gearbox. The engine was said to produce 9.5 bhp at 14,000 rpm.[4]

Racing history

The RC110 was displayed at the 1961 Tokyo Motor show in November 1961[3] and made its GP début at the 1962 Spanish GP in Barcelona by which time the number of gears had been increased to six. Despite this the bikes were easily out-gunned by the two-stroke opposition and this was Honda's first serious defeat since 1960.[1]

A massive effort at the factory meant that for the French GP just one week later, the bikes were fitted with eight gears[1] and then, another three weeks after that, for the IOM GP two completely new bikes arrived, now revving up to 17,000 and fitted with nine-speed gearboxes.[4] Despite all this effort, Honda's 50cc machines still could not match the success of their larger brethren. Averaging over 120 km/h around the TT course, Luigi Taveri and Tommy Robb could still only manage second and third places and although on a damp track at the Finnish GP, Luigi Taveri did manage to grab a single victory, overall the 1962 50cc season was a humiliation for the Honda team.[1]

World Championship results table

(key) (Races in bold indicate pole position; races in italics indicate fastest lap)

Year	Chassis*[nb 1]	Rider	1	2	3	4	5	6	7	8	9	10
			ESP	FRA	IOM	NED	BEL	GER	DDR	NAT	FIN	ARG
1962	Honda RC110 / RC111*	Luigi Taveri	3	3	2	9	3	4	4	6	1
	Honda RC110	Tommy Robb	5	4	3	11		7	5	Ret	2
	Honda RC110 / RC111*	Kunimitsu Takahashi	6	2
	Honda*	Tom Phillis	8
	Honda RC110	Derek Minter			9
	Honda*	Sadao Shimazaki			10		11	Ret
	Honda CR110 5 speed	Cees van Dongen				10
	Honda*	Teisuke Tanaka							7	Ret	5

Honda CR110

In contrast to the RC110, Honda developed a lower powered production version, the Honda CR110 Cub Racer. Aimed at the privateer rider for club and national status events, the CR110 proved more successful than the works machine and about 220 are said to have been sold worldwide. There were two versions, a five speed road machine with lights and silencers producing 7 hp at 12,700 rpm and the racing version with eight gears and 8.5 hp at 13,500 rpm.

Notes

1. No official records exist of which Honda machine this rider raced or which machine was raced at which circuit.[2]

References

1. Falloon, Ian (2005). The Honda Story (1 ed.). Sparkford, Yeovil: Haynes Publishing. p. 42. ISBN 1-85960-966-X.
2. Oxley, Mat (2001). The Challenge & Dream of Honda: 500 Grand Prix Motor Cycle Wins (1 ed.). Richmond, Surrey: Hazleton Publishing Ltd. p. 146. ISBN 1-903135-03-6.
3. Sibata, Kazuya. "Honda RC110" (in Japanese). Moto Modelling. Retrieved 28 November 2010.
4. Oxley, Mat (2001). The Challenge & Dream of Honda: 500 Grand Prix Motor Cycle Wins (1 ed.). Richmond, Surrey: Hazleton Publishing Ltd. p. 39. ISBN 1-903135-03-6.