Toshihiko Suzuki maintains the Lump Proof website
in Japan. Toshihiko concentrates on Classic Racing Lightweight
and Ultra-lightweight machines and his page is a delight.
The following are 4 pages of CR750 pics and
data. The 1st two feature
a Japanese based CR750 which has appeared at Suzuka. Page 3 has
some pics of CR750s in Australia as well as pics of the historic
win for Honda at Daytona in 1970. Page 4 has a series of pics
of a US based CR750 etc etc.
CR 750 Honda
Honda built the CR750 to race at Daytona in 1970.
The real racing however was done by legions of Honda riders all
over the world who raced kitted CB750 Fours against the best of
the rest. Honda sold a limited number of CR kits for the
Honda CB750 for US$10,000 which made them somewhat exclusive considering
CB750s could be bought for not much more than a grand at the time.
The kit consisted of a race camshaft, stronger valve springs,
oversize inlet valves and smaller exhaust valves, 2 ring 10.5:1
slipper pistons (standard is 3 ring 9:1), a close ratio gearbox
and battery-less ignition fixed at 35 degrees advance.
Also included were four open megaphones, rear
sets, racing seat, petrol tank, aluminium oil tank, fairing, twin
disks up front and a giant 240mm 2 leading shoe drum brake up
back.
Special camchains and primary chains were also supplied but this
did not prevent lots of cam chain failures during races.
The standard frame was used contributing to a
quite hefty racing weight of 385lbs. Using 31mm racing Keihin
carbs the CR750 produced a healthy 90ps at 9,700 rpm making it
the most pwerful race bike in its class.
Click below for more on the CR750
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