{"product_id":"ncy-compression-spring-gy6-1500-rpm-1200-1027","title":"NCY 1500 RPM Compression \/ Contra Spring | GY6 125-200cc CVT","description":"\u003cp\u003eFine-tune your CVT transmission's shift point and eliminate belt slip with the \u003cstrong\u003eNCY 1500 RPM Contra \/ Compression Spring\u003c\/strong\u003e for GY6 engines. Engineered for the rear clutch pulley, this performance spring is a direct upgrade for riders looking to optimize acceleration on 125cc, 150cc, 169cc, and 171cc GY6-based scooters.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents belt slip by increasing lateral pressure on the drive belt\u003c\/li\u003e\n\u003cli\u003eRaises CVT shift point for optimized acceleration at higher RPM\u003c\/li\u003e\n\u003cli\u003e1500 RPM rating — stiffer than stock for performance-oriented tuning\u003c\/li\u003e\n\u003cli\u003eISO 9001 certified manufacturing\u003c\/li\u003e\n\u003cli\u003eMade in Taiwan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWire Diameter:\u003c\/strong\u003e 4.2mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 48.5mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 154.0mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPM Rating:\u003c\/strong\u003e 1500 RPM\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eFits 157QMJ-based 125cc \/ 150cc \/ 169cc \/ 171cc GY6 engines with the following engine codes:\u003c\/p\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e157QMJ\u003c\/td\u003e\n\u003ctd\u003e161QMK\u003c\/td\u003e\n\u003ctd\u003e152QMI\u003c\/td\u003e\n\u003ctd\u003e1P61QMK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYN1P57QMJ\u003c\/td\u003e\n\u003ctd\u003e1P52FMI\u003c\/td\u003e\n\u003ctd\u003e154FMI\u003c\/td\u003e\n\u003ctd\u003eJJ157QMJ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1P57QMJ\u003c\/td\u003e\n\u003ctd\u003eBN157QMJ\u003c\/td\u003e\n\u003ctd\u003eBN161QMK-A\u003c\/td\u003e\n\u003ctd\u003eOther QMJ, QMK \u0026amp; QMI models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eMechanic's Notes\u003c\/h2\u003e\u003cp\u003eCompression springs (also called contra springs) serve two functions: they apply lateral pressure on the drive belt to prevent slip, and they control the RPM at which the CVT transitions from lower to higher gear ratios.\u003c\/p\u003e\u003cp\u003eFor optimum acceleration, match the clutch pulley transition RPM to your engine's peak power band. If your engine peaks at 7500 RPM but your spring transitions at 6000 RPM, you're leaving performance on the table.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStiffer Spring\u003c\/strong\u003e = More belt tension + higher RPM transition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSofter Spring\u003c\/strong\u003e = Less belt tension + lower RPM transition\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis spring is also available as part of our \u003ca href=\"https:\/\/www.scooterworks.com\/GY6-150-Stage-1-Performance-Kit-P8803.aspx\"\u003eStage 1 GY6 150 Performance Kit\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThis product is intended for off-road use only. Not intended for use on public roads. Not legal for use in California.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\"\u003eCalifornia Prop 65 Warning: www.p65warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e","brand":"NCY","offers":[{"title":"Default Title","offer_id":48112095559867,"sku":"1200-1027","price":20.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/NCY_1500_rpm_Contra_spring.jpg?v=1784301094","url":"https:\/\/thriftyscooters.com\/products\/ncy-compression-spring-gy6-1500-rpm-1200-1027","provider":"Thrifty Scooters","version":"1.0","type":"link"}