Motobécane diversified its production, first by presenting, at the 1929 Paris Motor Show, a four-cylinder side-valve 500 Type T5. This machine had poor performance since it was no faster than single-cylinder motorcycles of similar displacement, and overheated excessively. Only about ten of these were sold.
But Motobécane did not give up: the following year they presented a new, extensively redesigned four-cylinder engine equipped with an overhead camshaft and a displacement of 750 cc, named the "B7." Although it remained in the catalog for two years, it was delivered in small quantities and its development was never truly completed.
The B5 (T5) 500 cc and the B7 (T7) 750 cc 1929/1930
3 exceptional prototypes, 4 cylinders (500 with side valves and 750 "overhead" with overhead camshaft) presented in the 1930 catalogue and at the Paris Motor Show the same year.
1929 500 Type T5
500 cm3 4T Sidevalve
TYPE B5. - BLOC MOTEUR. – 4 Cylindres. - Alésage 46. – Course 75.
Transmission par arbre et couple conique. – 3 Vitesses. – Pneus de 27X4. - Réservoir nickel, éclairage et allumage par dynamo et accumulateurs, avertisseur.
TYPE B5. - ENGINE BLOCK. – 4 Cylinders. - Bore 46. – Stroke 75.
Transmission by shaft and bevel gear. – 3 Speeds. – 27X4 tyres. - Nickel tank, lighting and ignition by dynamo and accumulators, horn.
1930 750 Type B7
750 cm3 4T OHV
Presented at the October 1930 Motor Show, the B7 is a 750 with an overhead camshaft controlled by a vertical shaft, visible at the front of the engine.
Sources: moto-histo.com
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