• Out of stock
    Amp 520SS12HT-17/14 Amp 520SS12HT-17/14

    Amp 520SS12HT-17/14

    FITS QS Motor 138 70H V3, QS Motor 138 90H V3

    $38.00
    Temporarily out of stock. New inventory is expected around October 16, 2026. Check back soon for availability. High Torque 520 12T Racing Sprocket Designed specifically for QS 138 70H V3 and QS 138 90H V3 geared motors. Constructed from hardened steel for maximum durability and galvanized in silver to resist corrosion. IMPORTANT FITMENT NOTICE: This sprocket is engineered for use with QS 138 70H and 90H V3 geared motors only. Before ordering, please measure your motor shaft carefully to confirm compatibility. The spline profile of this sprocket is as follows:
    • Widest inner spline diameter: 16.9mm
    • Narrowest inner spline diameter: 14.3mm
    This is a press-fit sprocket and must be tapped into place using a mallet and a block of wood. We test-fit each design to actual QS motors during production to ensure the best possible fitment. Every sprocket is manufactured with strict tolerances and goes through quality control checks on the production line. If you experience difficulty during installation, it may be due to minor inconsistencies in QS motor shaft dimensions, which can vary slightly between manufacturing batches.
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  • Amp 520SS12HT-23/20 Amp 520SS12HT-23/20

    Amp 520SS12HT-23/20

    FITS 2019-2020 Honda CRF450L, 2019-2023 Honda CRF450X, 2021-2023 Honda CRF450RL, Golden Hypertorque HTM11KW

    $38.00

    Amp 520SS12HT-23/20 - High Torque 520 12T Racing Sprocket for Golden Hypertorque & Honda CRF450L Series

    PLEASE NOTE: This sprocket does fit the Honda CRF450L spline BUT it may cause chain rub on the motor casing. Please be aware that using this 12t sprocket on the CRF450 series bikes may require case modifications. 

    Upgrade your ride with the Amp 520SS12HT-23/20, a high-performance 12-tooth 520 racing sprocket engineered for maximum torque and acceleration. Designed specifically for the Golden Hypertorque motor and Honda CRF450L, CRF450X, and CRF450RL motorcycles, this sprocket is built to deliver unmatched durability and performance on the track, trails, and hills.

    Key Features:

    • Precision Engineered for Power – Optimized tooth design enhances torque delivery, improving acceleration and hill-climbing ability.
    • Hardened Steel Construction – Built for maximum durability, resisting wear and deformation under high-stress riding conditions.
    • Galvanized Silver Coating – Corrosion-resistant finish ensures long-lasting performance in all weather conditions.
    • Integrated Rubber Dampener – Reduces chain noise for a smoother, quieter ride.
    • Perfect Fit for Honda CRF450 Series – Specifically designed to fit the CRF450L, CRF450X, and CRF450RL models.

    Compatible Honda Models:

    • 2019-2020 Honda CRF450L
    • 2021-2023 Honda CRF450RL
    • 2019-2023 Honda CRF450X

    This heavy-duty racing sprocket is the perfect upgrade for riders looking for more torque, better acceleration, and improved chain noise reduction. Whether you ride a Honda CRF450L, CRF450X, or CRF450RL, or you have the Golden Hypertorque motor, this sprocket delivers reliable performance for demanding terrain.

     

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  • Amp 520SS11HT-16/20 Amp 520SS13HT-16/20

    Amp 520SS13HT-16/20

    FITS QS Motor QS 165 60H V3

    $36.00

    High Torque 520 13T Racing Sprocket

    Designed specifically for the QS165 60H v3 gearbox motor with the newer 16/20 mm 6-spline output shaft.

    Constructed from hardened steel for maximum durability and engineered for high-power electric motorcycle, kart, and ATV applications.

     

    Full Product Description

    The Amp 520SS13HT-16/20 was developed specifically for the QS165 60H v3 gearbox motor utilizing the newer 16/20 mm 6-spline output shaft. This precision CNC-machined sprocket provides a direct-fit solution for riders seeking increased top speed while maintaining the strength and reliability required for high-power electric motorcycle applications.

    Constructed from hardened steel and manufactured to strict tolerances, this sprocket is designed to withstand the demands of high-performance electric motorcycles, karts, ATVs, and custom vehicle projects.

    The 13-tooth configuration is ideal for riders looking to reduce motor RPM at cruising speeds and increase vehicle top speed while still maintaining strong acceleration characteristics. It is particularly popular for street-focused builds and higher-speed applications.

    Each sprocket includes the retaining plate and mounting hardware required for installation.

    Developed based on direct feedback from the Electric Motorcycle Builds community.

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  • Amp 520TS10HT-90H Amp 520TS10HT-90H

    Amp 520TS10HT-90H

    FITS QS 138 90H

    $42.00

    High performance sprocket made specifically to fit the tapered shaft QS Motor 138 4000W 90H Motor. Sprocket comes complete with 5mm key bar. This sprocket works well with 520 standard and O-ring chains.

    This sprocket fits the tapered shaft version of the QS 138 90H motor.

    Tapered bore dimensions: 21.15mm diameter to 24.5mm diameter
    Keybar width: 5mm

    IMPORTANT (Instructions for Installation):
    When attaching this sprocket to the tapered shaft DO NOT torque down the shaft nut with excessive force. Over torquing the shaft nut on the sprocket could cause the sprocket to crack due to over expansion down the tapered shaft. Fitment of the sprocket and shaft nut should just be snug. For best fitment it is recommended to use a bushing between the sprocket and bearing race, use thread lock on shaft nut and tighten shaft nut to no more than 3 ft/lbs of torque. Amp Sprockets can NOT be held responsible for any sprockets that have cracked due to over torquing on tapered shafts during installation.

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