Performance Parts

Extreme Motor Sales offers a wide selection of 50cc scooter parts.
Our 50cc scooter parts include GY6 parts performance kits, variator, performance exhausts, big bore kits & more. 

GY6 50 High Performance Parts
GY6 50 139 QMB High Performance Parts and Upgrades 49cc
139QMB/139QMA 49cc Scooter Engine High Performance Parts

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    Kick stand for a wide range of 50cc 125cc 150cc and 250cc Full-Size Scooters.

    • $49.99

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    SSP-G Billet Aluminum After-Market 9 Inch Kick stand for a wide range of 50cc 125cc 150cc and 250cc Full-Size Scooters.

    • $49.99

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    Hoca Billet Aluminum After-Market 11.75 Inch Kick stand for a wide range of 50cc, 125cc, 150cc and 250cc Full-Size Scooters.

    • $49.99

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    OKO Performance Cooling Fan for 50cc 4-stroke QMB139 engines.

    • $19.99

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    Ban Jing High Performance Microchip Programmed CDI/Coil for use on 50cc-500cc, 4-stroke Scooters.

    Ignite your vehicle's true performance potential! This High Performance CDI/Coil gives stronger ignition/firing, a more complete combustion burn (more power, better fuel mileage and reduced emissions), quick acceleration and increased horsepower!

    Installation is Easy:

    • Connect red wire to 12 volt switched source (DC) 
    • Connect black wire to ground
    • Connect blue wire to the signal pulse of the stator (alternator)
    • CDI body can be easily mounted to the frame
    • $159.99

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    Hoca QMB139 Torque Springs.
    Please select from 1000, 1500 or 2000 RPM options on checkout.

    • $24.99

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    Hoca 44mm Stroker Crankshaft Assembly for 50cc 4-stroke QMB139 engines.

    • $189.99

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    SSP-G QMB139, 50cc 4-stroke performance camshaft.

    • $59.99

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    Dr. Pulley Variator Slides for 50cc 4-stroke QMB139 engines.

    The Slide Pieces in the variator are equally as important as the rollers. It is highly recommended to change the slide pieces to coincide with the rollers. The Dr. Pulley Variator Slides are made of the same abrasion-resistant nylon as the Dr. Pulley Roller Weights, which promises a long life.

    • $9.99

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    Hoca Roller Weights size 16x13 for 50cc 4-stroke QMB139 engines. The QMB139 is the most popular 50cc 4-stroke engine found on Chinese scooters.

    We recommend starting performance upgrades by changing the variator roller weights first.

    Heavier roller weights= A slower take off speed with more acceleration and a higher top speed. 

    Lighter roller weights = A faster take off speed with less acceleration and lower top speed.

    • $11.99

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    Dr. Pulley 16x13 Round Roller Weights for 50cc 4-stroke QMB139 engines.
    Please select weight from drop-down menu.
     
    Dr. Pulley Round Roller Weights have exceptional durability, heat resistance and are low friction and low wear.

    • $19.99

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    Dr. Pulley 16x13 Sliding Roller Weights for 50cc 4-stroke QMB139 engines.
    Please select weight from drop-down menu.
     
    Traditionally, gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp of the Movable Drive Pulley (MDF). 
     
    Now the innovative Dr. Pulley Sliding Roller Weights slide up-and-down the ramp to change the gear ratio. This unique sliding movement (not rolling) provides exclusive advantages to increase CVT performance. With Dr. Pulley, no abnormal wear will occur even when running in high gear.

    • $29.99

    Score: 5.00. Votes: 1
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