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Polini Performance Torque Spring - 2 Stroke 50cc

Polini Performance Torque Spring - 2 Stroke 50cc

$20.00
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Polini Performance Torque Spring - 2 Stroke 50cc
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  • Polini Performance Torque Spring - 2 Stroke 50cc
Polini Performance Torque Spring - 2 Stroke 50cc

Polini Performance Torque Spring - 2 Stroke 50cc

$20.00
Part number 146-83

Check dimensions and compatibility before ordering.
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Polini performance CVT torque spring for the Yamaha Zuma 50 and Minarelli-based 50cc scooters. Runs 15% stiffer than stock, applying constant lateral pressure against the rear pulley sheaves to keep the drive belt loaded within the optimal powerband. Eliminates mid-range transmission lag, sharpens throttle response, and improves back-shift response on deceleration. Made in Italy.

Off-road use only. Not intended for use on public roads or land.

Tuning note: A stiffer torque spring alters CVT balance. If the transmission stays in a low ratio too long or over-revs, increase roller weight slightly to counterbalance the new spring rate.

Installation tip: The rear clutch pulley is under heavy internal tension. Always use a dedicated clutch compressor tool when loosening the retaining nut.

Features

  • 15% stiffer than stock — raises shift RPM to bypass factory flat spots
  • High-tensile silicon-steel alloy — resists spring sag and thermal fatigue
  • Improves back-shift response on deceleration
  • Made in Italy by Polini

Specifications

Spring Rate +15% over OEM stock
Material High-tensile silicon-steel alloy
Color Blue
MPN 243.093
Brand Polini
Origin Made in Italy

Model Fitment

Brand Models
Yamaha Zuma 50 2T, Zuma 50F / 50FX / C3 / Vino 4T, Jog 50 / Jog RR
Genuine Scooter Co. Buddy 50, RoughHouse 50, Rattler 50
Aprilia Scarabeo 50 2T, SR 50 (Minarelli)
Adly / Keeway / Eton Beamer, Matrix, F-Act, Hurricane, Viper 50

 

California Prop 65 Warning: www.p65warnings.ca.gov

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