The "B" block was the first 4-stroke engine manufactured by Motobécane. Available in several displacements, from 175 to 500cc, with side valves, overhead valves or even 4 valves for the extremely rare 500 B5C GS. The gearbox is integral with the crankcase, this configuration being particularly modern for a time when the separate box was very much the norm.
The "B blocks" (or T at Motoconfort)
B2s - B22 (175 cc)
B33 (212 cc)
B23 (222 cc)
B3 (250 cc)
B33a (250 cc SV)
B33c (250cc culbuté)
B3l (250 cc SV)
B3c (250 cc culbutés) - B3cs (250 cc culbutés "sport")
B34 (326 cc SV)
B4 (350 cc) - B4l (350 cc SV)
B4c (350 cc culbutés) - B4cs ("sport") - B4cgs ("Grand sport")
B44 (350 cc SV) - B44l (350 cc SV)
B44 st
B44c (350 cc culbuté) - B44cl - B44c st (350 cc culbuté standard)
B44l
B5 (500cc) - B5l
B5c - B5cs - B5 cgs
B55 - B55c
1931 175 Type B2S
175 cm3 4T SV
On this budget model, the chrome plating is limited to the gearshift lever, the kickstarter and the exhaust system.
1930 250 Type B3
250 cm3 4T Sidevalve
1930 250 Type B3C Sport
250 cm3 4T OHV
The "Sport" designation implied a rear kickstand handle and more extensive chrome plating. The rocker arms were enclosed and the handlebar levers were again reversed.
1930 350 Type B4
350 cm3 4T SV
Presentation at the 1930 Motor Salon of the B4 model, with 350 cm3 3-speed B block; here in the "luxury" version with NOVI electric lighting.
An article on Motobecane types B3C and B4C appeared in Moto Revue on July 25, 1931.
1931 500 Type B5
500 cm3 4T Sidevalve
The right side of the B5 shows the under-housing belt drive of the three-brush Novi 6-volt dynamo.
1932 500 Type B5CS
500 cm3 4T OHV
The 500 type B5C Grand sport is the famous 4-valve with dual exhausts which won two races in its category at the Bol d'Or in 1932 and 1933 as well as the ISDT in 1932.
1934 250 B3A
250 cm3 2T
A lesser known model from of the 250 range. Two years after the official end of production, the 250 resurfaced slightly modified with contemporary cycle part elements and especially equipped with a flywheel ignition. This motorcycle will not appear in any catalog but will nevertheless be released in a very limited series.
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