Paton 500 V90

The single copy of the V90 does not exist any more.  This is the BM4 which is very similar

 

 

 

 

Make Model

Paton 500 V90

Year

1976 - 85

Engine

Four cylinder, 2 stroke, single shaft, 4 valves per cylinder

Capacity

492 cc / 30.0 cub in
Bore and Stroke 56 x 50 mm

Carburetor

4 x Dell'Orto 34 mm carburetors
Cooling Liquid cooled
Ignition Electronic with variable advance, Dansi
Clutch Dry, multiplate

Max Power

69.9 kW / 95 hp @11000 rpm
Transmission 6 Speed
Final Drive Chain
Frame Tubular steel chrome-molybdenum

Front Suspension

Telescopic forks Ceriani R 35 mm

Rear Suspension

Tubular swingarm with Ceriani R monoshock

Front Brakes

254 mm Double disc, Fountain

Rear Brakes

254 mm Disc, Fountain

Source

Wikipedia

The Paton V 90 BM 4 is a racing bike built ​​in 1976 by ​​the motorcycle manufacturer from Milan Paton. This Paton was the first Paton motorcycle powered by a two-stroke engine, which replaced the old two-cylinder engine four-stroke which was no longer competitive.

As for the model that it replaced, its frame in tubular steel chrome-molybdenum was commissioned to Bimota, and in that it provided the same Aermacchi AMF used by Harley Davidson and Yamaha that allowed them to win world titles.

In order to save time and resources, Paton a two-stroke liquid-cooled Harley-Davidson 250 of Walter Villa , who had been offered for sale. 

Combining the cylinders in one block and crankshaft specially designed to form a V4 engine at 90 ° coupled to the transmission of the Harley-Davidson 350 Grand Prix.
 

Racing results

The bike was taken to debut in the first race of the Italian Senior Championship in 1976 in Modena by Virginio Ferrari, but with no satisfactory result, so Ferrari left Paton for Team Gallina, convincing Pattoni to review completely the bike, replacing the Bimota frame with one made by Fiorentina Segoni Special and reviewing the motor (the rear cylinders were rotated), brought to the track at Mugello by Mimmo Cazzaniga.

The new structure did not improve the results, forcing Paton to quit racing. Paton turned to competition in 1983, with a new bike, the C1, with an engine incorporating many of the concepts  '76, but with variations: new cylinders derived by Cagiva WMX , lamellar induction in the crankcase, carburetors Dell'Orto 36 mm, electronic ignition Motoplat, double cradle tubular Cr-Mo chassis realized by Claudio Colombo (creator of all frames up to the Paton 2000 ). In 1985 it was replaced by the new V115 C3 .

The BM4 was built in a single copy, which no longer exists.