{"product_id":"nor-am-na108-green-clutch-spring-3700-rpm-star-2550-rpm-minicup-stall-racing-kart-class","title":"Nor-Am NA108 Green Clutch Spring - 3700 RPM Star \/ 2550 RPM MiniCup Stall - Racing Kart Class","description":"\u003cp\u003eDialing in your clutch engagement is the most critical tuning adjustment you can make on a \u003cstrong\u003eracing kart\u003c\/strong\u003e, dictating exactly how power transfers from the crank to the asphalt. The Nor-Am NA108 Green Spring is engineered specifically for stall specialists who demand absolute reliability under extreme heat and relentless friction. By holding back engagement until the engine reaches peak torque, this spring unleashes power in a violent, controlled torrent. Whether you are running a high-output \u003cstrong\u003ekart racing motor\u003c\/strong\u003e or a standard clone, maintaining consistent spring tension lap after lap is what separates podium finishers from the rest of the pack.\u003c\/p\u003e\u003ch2\u003eUnmatched Durability for Your Kart Racing Motor\u003c\/h2\u003e\u003cp\u003eClutch springs endure brutal thermal loads, but the NA108 Green Spring thrives in the redline's fire. Manufactured from high-tensile, heat-treated steel alloy, it resists the dreaded spring sag that plagues inferior components. This means your engagement RPM remains dead-on throughout a grueling enduro sprint or a rapid-fire drag launch. If you've been browsing for a new \u003cstrong\u003ego kart motor for sale\u003c\/strong\u003e because your current setup feels sluggish off the line, the culprit might just be a fatigued clutch spring. Upgrading to the NA108 ensures your engine's power crests exactly when you need it, maximizing acceleration out of tight hairpins without compromising the integrity of your drive-line.\u003c\/p\u003e\u003ch2\u003eConsistent Launches and Better Traction\u003c\/h2\u003e\u003cp\u003ePower is useless if you can't put it to the ground. By delaying engagement to a precise 3700 RPM on Nor-Am Star clutches (and 2550 RPM on MiniCup setups), the NA108 allows the engine to spool up into its optimal powerband before the shoes bite the drum. This precise lock-up prevents bogging and ensures that your \u003cstrong\u003ego kart tires\u003c\/strong\u003e receive a smooth, predictable surge of rotational force. For racers searching for \u003cstrong\u003ego karts for sale near me\u003c\/strong\u003e or building a custom chassis from the ground up, integrating a reliable, heat-resistant clutch spring like the NA108 is a fundamental step in building a bulletproof drivetrain.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Engagement:\u003c\/strong\u003e Delivers a dead-on 3700 RPM stall on Star clutches and 2550 RPM on MiniCup setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat-Treated Alloy:\u003c\/strong\u003e Resists thermal fatigue and spring sag during extreme endurance races.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Tension:\u003c\/strong\u003e Maintains peak load integrity, ensuring your launch RPM never drifts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Power Transfer:\u003c\/strong\u003e Allows the engine to reach peak torque before clutch shoes engage the drum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual Identification:\u003c\/strong\u003e Bright green marker streamlines pit-box inventory and quick trackside tuning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Reliability:\u003c\/strong\u003e Built to handle the aggressive vibrations of a high-revving kart racing motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrag-Style Burst Capability:\u003c\/strong\u003e Perfect for aggressive standing starts and tight corner exits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if the NA108 Green Spring is the right choice for my kart?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The NA108 Green Spring is designed for racers who need a higher stall speed to reach their engine's peak torque before engagement. If you are experiencing \"bogging\" off the line or out of tight corners, this spring helps the engine spool up to 3700 RPM (Star) or 2550 RPM (MiniCup) before the clutch bites, providing a more aggressive launch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I mix and match different color springs in my Nor-Am clutch?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is highly recommended to use a matching set of springs across all clutch shoes. Mixing spring tensions will cause uneven engagement, leading to premature shoe wear, vibration, and inconsistent handling on the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my clutch springs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Clutch springs are wear items subject to extreme thermal stress. You should inspect them for \"sag\" or loss of tension if you notice your engagement RPM dropping over time. If you race competitively, replace them periodically to ensure your launch RPM remains consistent throughout the season.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the NA108 Green Spring compatible with both Star and MiniCup clutches?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this spring is versatile and fits both systems, though it provides different stall characteristics depending on the clutch type: 3700 RPM for Star clutches and 2550 RPM for MiniCup setups.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/na107-purple-spring-na107\"\u003eNA107 Purple Spring 3400 RPM Star and 2400 RPM MiniCup Stall\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/na105-white-spring-na105\"\u003eNA105 White Spring 2800 RPM Star and 1850 RPM MiniCup Stall\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/na102-brown-spring-na102\"\u003eNA102 Brown Spring Low Stall for Mini Cup and Star Clutches\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/na039-shoe-for-minicup-clutch-sold-each-three-reqired-na039\"\u003eMiniCup Clutch Shoe Individual Replacement for Nor-Am Systems\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/naky025-key-for-star-clutch-naky025\"\u003eStepped Key for Secure Nor-Am STAR Clutch Assembly\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SwiftKarting","offers":[{"title":"Default Title","offer_id":52380201419071,"sku":"NA108","price":12.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/6843\/4239\/files\/nor-amstarclutches-na108-green-spring-na108.jpg?v=1773223191","url":"https:\/\/metro-merch-3.myshopify.com\/products\/nor-am-na108-green-clutch-spring-3700-rpm-star-2550-rpm-minicup-stall-racing-kart-class","provider":"Metro Merch","version":"1.0","type":"link"}