The fastest 250cc single of the world

16 Feb 2015 | Author: | Comments Off on The fastest 250cc single of the world
Benelli 500 LS

Meanwhile the Morini staff had decided at the beginning of the Italian RR championship season to also support Bergamonti, supplying him with a 250cc DOHC factory racer. Villa was groggy after an incident during the Rimini race and Bergamonti had started a special feeling to the Morini; in fact: thanks to a special kit, developed by him (in his own workshop), many private racers could continue their racing career on the Morini Settebello overbored to 250cc.

Bergamonti’s debut was dazzling; during his first race for the tricolore (Italian RR championship) at the Vallelunga (Rome) racetrack, he was leading when the battery fails, leaving him running the last meters with a dead engine, allowing Grassetti to take the win on the finish line. Success arrives at the second race; although being faced by the two Benelli 4s of Grassetti and Pasolini, Bergamonti takes the win easily ahead of Walter Villa on his Montesa and both Benelli’s suffering from mechanical failures.

Thanks to this score the gap between Bergamonti on Moto Morini and his competitors, that Bergamonti has no problem taking the championship.

The last year

In the face of the competition of the many multi-cylinders machines, during the 1968 season, the Morini 250cc DOHC receives an additional technical upgrade, necessary to keep it at a competitive stage. The last races of the Morini 250cc are at the Mototemporada romagnola (downtown races held in the Romagna region), the series of races held on the down-town racetracks of Rimini and Cesenatico and also at the Imola raceway.

The first race at Modena had to be stopped, due to adverse weather conditions, Bergamonti classified second at Rimini, finishing after Renzo Pasolini on his Benelli 4 cilinder. At Cesenatico Bergamonti was fourth after Ralph Brians (Honda 6), Pasolini (Benelli 4) and Phil Read on the Yamaha 2 stroke 4 cylinder. Is there still space for a single?

For the out come we have to wait until the race at Imola where Bergamonti on his Morini is third, battling against Brians, Pasolini, Grassetti and the couple Read-Ivy on their Yamaha’s. It’s an important result, confirming how the Morini can still be named the best 250cc single. On the contrary those 3 races show that all ambitions for a victory are passed. And any additional work on the motorcycle can’t help competing with the multi-cylinders taking the lead.

Not only the 4 strokes but now also 2 strokes as well. At this stage, the Bolognese factory quits it’s racing activities.

The first DOHC After two years of racing success, let’s explain how the Morini 250cc came to these results. The DOHC design had already been selected in 1956 for the factory racer, the same year as the 175 DOHC Rebello made it’s first appearance. It was then a short step from the 175cc to a 250cc capacity. In 1957 the first 250cc DOHC with a capacity of 246.66 cm3, having a bore of 69 mm and a stroke of 66 mm, was entered in to competition.

The distribution is driven by a chain as for the Rebello. The cylinder head and the valve guides were made from light alloy. On the right side of the cylinder head there is the gear, driven by the chain, that joins (to another 2 intermediate gears) the 2 outer gears are connected to the camshafts. These move the valves through pushrods, held into position by 2 external springs.

The 29 HP (@ 10’000 rpm, compression ratio of 9.5. 1) the fuel is supplied to

Benelli 500 LS
Benelli 500 LS
Benelli 500 LS

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