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If the belt width has worn down by more than 1mm from its original 18mm specification
you must upjet your carburetor and modify your airbox for increased airflow
Compatible Engine: GY6 QMI/QMJ 152/157 (B-case long case)
Jet 50 Vespa ET2
and combustion chamber geometry produce high turbulence for better fuel efficiency and reduced exhaust emissions
Universal Parts QMB139 Longcase Engine stella auto If the belt width hasUniversal Parts Premium QMB139, 49cc 4 Stroke complete engine, long crankcase version is the top of the line aftermarket replacement engine available in the marketplace. This is the only engine that has earned the Universal Parts stamp for our stringent quality and performance standards. Engine is set up for PAIR Emissions System. PAIR is an acronym for Pulsed Secondary Air Injection System. It is an emissions control system used to lower HC and CO
