{"product_id":"speed-kit-for-gx390-13-15hp-ohv-engines-stage-3","title":"Speed Kit for GX390 \u0026 13\/15hp OHV Engines, Stage 3","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003ca href=\"https:\/\/gokartsusa.biz\/pages\/speed-kit-selection-guide\" title=\"Speed Kit Selection Guide\" style=\"background-color: rgb(255, 255, 0);\"\u003eSpeed Kit Selection Guide\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA step up from our \u003c\/span\u003e\u003ca href=\"https:\/\/gokartsusa.biz\/products\/speed-kit-gx340-to-gx390-420-predator-1315hp-ohv-stage-2\"\u003e\u003cb\u003eStage 2 kit\u003c\/b\u003e\u003c\/a\u003e\u003cspan\u003e, this is designed to wake up GX390s, allowing 20+ HP!\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eKit Includes:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRace\/Open Air Filter \u0026amp; Adapter\u003c\/li\u003e\n\u003cli\u003eHeavy Duty Valve Springs\u003c\/li\u003e\n\u003cli\u003eOffset Timing Key\u003c\/li\u003e\n\u003cli\u003e23.5mm Bored Honda Carburetor\u003c\/li\u003e\n\u003cli\u003e280 Lift Camshaft\u003c\/li\u003e\n\u003cli\u003eReinforced Rocker Arms\u003c\/li\u003e\n\u003cli\u003eBillet Rod (+.040 Longer)\u003c\/li\u003e\n\u003cli\u003eCarb and Side Cover Gaskets\u003c\/li\u003e\n\u003cli\u003e\u003ci\u003eOptional \u003ca href=\"https:\/\/gokartsusa.biz\/collections\/gokart-minibike-racing-exhaust\"\u003eHeader\/Exhaust\u003c\/a\u003e\u003c\/i\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ci\u003eOptional Aluminum Flywheel\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e\u003cbr\u003e\u003cspan\u003e\u003ci\u003e*Note:\u003c\/i\u003e\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e\u003ci\u003e Use of the choke bracket requires a stock Honda (or Chinese OHV) \"air filter-to-carb gasket\". This is not included in the kit. You can use the one that came with the motor.\u003c\/i\u003e\u003c\/span\u003e\u003cspan\u003e\u003ci\u003e\u003cbr\u003e\u003c\/i\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ci\u003eBillet aluminum flywheel recommended. Stock flywheels, especially \"clones\", are prone to failure and are very dangerous.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eUT2 series\u003c\/strong\u003e Hondas (2012 \u0026amp; up) and later have a built-in rev limiter in the coil and will require a new coil to exceed 4000rpm. The UT2 coils (4 wire) can only be used with stock flywheels, and Billet 6693 Flywheel.\u003c\/i\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ci\u003eIf using another billet flywheel, you must run a \u003cstrong\u003eUT1 style\u003c\/strong\u003e coil (single wire). 13\/15 Chinese engines (414, 420, and 460) usually have UT1 style coils already. However, some Lifans and 420s have a digital ignition and will need a Honda UT1 coil to run the billet flywheel.\u003cbr\u003e\u003cbr\u003ePicture is for reference only and may show optional parts. See above description for actual content.\u003cbr\u003e\u003cbr\u003eFilter should be sprayed with K\u0026amp;N type oil, especially for dirt applications.\u003c\/i\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"GoKarts USA®","offers":[{"title":"No Flywheel \/ No Coil","offer_id":43110534742075,"sku":"NR-STAGE3KIT392","price":395.0,"currency_code":"USD","in_stock":true},{"title":"No Flywheel \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110534774843,"sku":"NR-STAGE3KIT390","price":465.0,"currency_code":"USD","in_stock":true},{"title":"No Flywheel \/ Add Genuine Honda UT1 Coil","offer_id":43110534807611,"sku":"NR-STAGE3KIT391","price":439.0,"currency_code":"USD","in_stock":true},{"title":"Add Aluminum Flywheel - Recoil Start \/ No Coil","offer_id":43110534840379,"sku":"NR-STAGE3KIT395","price":561.0,"currency_code":"USD","in_stock":true},{"title":"Add Aluminum Flywheel - Recoil Start \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110534873147,"sku":"NR-STAGE3KIT393","price":631.0,"currency_code":"USD","in_stock":true},{"title":"Add Aluminum Flywheel - Recoil Start \/ Add Genuine Honda UT1 Coil","offer_id":43110534905915,"sku":"NR-STAGE3KIT394","price":605.0,"currency_code":"USD","in_stock":true},{"title":"Add Aluminum Flywheel - Electric Start \/ No Coil","offer_id":43110534938683,"sku":"NR-STAGE3KIT398","price":618.0,"currency_code":"USD","in_stock":true},{"title":"Add Aluminum Flywheel - Electric Start \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110534971451,"sku":"NR-STAGE3KIT396","price":688.0,"currency_code":"USD","in_stock":true},{"title":"Add Aluminum Flywheel - Electric Start \/ Add Genuine Honda UT1 Coil","offer_id":43110535004219,"sku":"NR-STAGE3KIT397","price":662.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/5159\/8139\/files\/STAGE3KIT390-2.png?v=1764893757","url":"https:\/\/gtcracing.com\/products\/speed-kit-for-gx390-13-15hp-ohv-engines-stage-3","provider":"GTC Racing","version":"1.0","type":"link"}