Small primary gear -BGM PRO- Vespa V50 (4-speed), PK50 S-XL - 16 tooth 51997

Everybody knows the problem, the original transmission ratio is simply too short for tuning cylinders. The cylinder turns dead or the power is not converted into speed in a reasonable way.
The bgm PRO primary wheel quickly remedies this. Without having to split the engine. Even the clutch basket does not have to be disassembled to replace the original sprocket (15 teeth) of all 4 speed V50 up to PK50 XL1 against the sixteen tooth version from bgm.
Ideal addition for all cylinder kits with 75 cc displacement. The speed increases by about 10 km/h and the engine is not so heavily loaded by the speed reduction.
Hardened are the bgm transmission gears with 58 HRC and thus correspond to the Piaggio OEM quality.
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