1986 Yamaha 0W81
With Phil Aynsley
In previous years a number of growth adjustments had been made to the YZR, then 1982 noticed the introduction of the primary V4 500 cc two-stroke into modern GP competitors (0W61).
As well as an Antonio Cobas impressed alloy beam body was used (forming the premise of the later Deltabox frames). 1984 noticed the motor up to date to make use of crankcase reed-valves (0W76).
It was redesigned once more the next 12 months, 1985, (0W81) to function twin crankshafts rotating in reverse instructions.
This had the rear crankshaft rotating ahead and the entrance crankshaft rearward, with drive being taken from the rear crankshaft.
This was performed to cancel out the gyroscopic forces of the engine internals, bettering dealing with stability. The moist weight of the bike was 118 kg.
Lawson rode the bike to second place within the 1985 Championship (three wins) behind Freddie Spencer on the Honda NSR500 (seven wins). Christian Sarron got here third on one other 0W81.
1986 noticed solely minimal adjustments to the bike (and no mannequin quantity change). Output was boosted from 140 hp to 145 hp, and a brand new seat form was used.
Lawson received the 1986 Championship (his second) with seven firsts, two seconds and one third place (he additionally recorded one DNF).
Wayne Gardner got here second in 1986 with three firsts, 4 seconds, one third, and two different factors finishes.
YZRs within the fingers of Randy Mamola, Mike Baldwin, Rob McElnea and Christian Sarron took third to sixth positions respectively, dominating the highest of the factors tally for Yamaha in 1986.
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