Kawasaki KR250 GP as raced by Gregg Hansford

1977 Kawasaki KR250 GP

As raced by Gregg Hansford

Kawasaki’s Grand Prix efforts started in 1966 with a 125cc water-cooled, disc-valve 2-stroke twin – which received the 1969 title with Dave Simmonds aboard. The KR3 V-4 was additionally developed from 1967.

Gregg Hansford’s 1977 Kawasaki KR250 GP Racer
The KR250 was Kawasaki’s devoted racing design

The corporate’s 250cc efforts began in 1967 with the a lot much less unique A-1R, primarily based on their street bike (Kawasaki A1-R 250 rotary valve racer) and later, a smaller model of their 350cc Bighorn motor.

The KR250 was preceeded by the A-1R, and noticed nice success in 1977 and 1978 in Hansford’s palms
The Kawasaki KR250 powerplant, able to propelling the bike to 250 km/h

It wasn’t till 1975 that their first devoted racing design appeared, the KR250.

1977 launched the 360º Twingle engine format following vibration points
Gregg Hansford’s KR250 GP Racer

This was a tandem disc-valve twin with contra-rotating 180º cranks. The primary bikes additionally used a standard rear suspension format however with solely a single rear shock mounted on the RH facet of the swingarm.

Gregg Hansford’s KR250 GP Racer
Gregg Hansford’s KR250 GP Racer – A 350 variant was additionally run

Issues with fierce engine vibration noticed a 1977 redesign with the motor altering to a 360º “Twingle” format with each pistons rising and falling collectively. A centrally mounted mono-shock rear suspension was additionally employed from this time.

The KR250 ran a central monoshock with the 1977 replace

The KR250 (and its KR350 sibling) had been extraordinarily profitable from 1978 till they had been retired in 1982.

The KR250 was finally retired in 1982

Kork Ballington received each the ’78 and ‘79 250 and 350 titles, with crew mate Gregg Hansford second within the 250 class and third within the 350 each years.

Gregg Hansford ran runner as much as Kork Ballington in 1978 and 1979

Anton Mang received the 250 title in ’80, ’81 and ’82 in addition to the 350 title in ’81.

Gregg Hansford’s KR250 GP Racer

The design’s gentle weight, good energy, slim profile and glorious floor clearance had been all main contributing elements in its dominance.

Gregg Hansford’s KR250 GP Racer – Kawasaki’s unique GP efforts kicked off with a 125 cc disc-valve two-stroke twin earlier than evolving to the KR250

For 1978 the output was 62 hp at 12,000 rpm with a weight of 104 kg – which gave a high pace of round 250 km/h.

Gregg Hansford’s KR250 GP Racer – Exterior shock reservoir, previous to the central monoshock an off-set monoshock was run

The bike seen right here is the one raced by Hansford in 1977-78.

Gregg Hansford’s KR250 GP Racer – Each pistons rose and fell collectively – Energy reached 62 hp
Gregg Hansford’s KR250 GP Racer
Gregg Hansford’s KR250 GP Racer – Entrance disc brake