{"product_id":"speed-kit-for-gx340-gx390-420-predator-and-13-15hp-ohv-stage-1","title":"Speed Kit for GX340-GX390, 420 Predator, and 13\/15hp OHV, Stage 1","description":"\u003cp\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\/p\u003e\n\u003cp\u003e\u003cspan\u003eBasic kit for improving the performance of GX390s, 420 Predators, 13\/15hp (440-460cc) OHVs. Simple to install, you can expect significant performance increases!\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\u003eJet for Application\u003cspan\u003e \u003c\/span\u003e\u003ci\u003e(*see notes below*)\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ci\u003eOptional Ignition Coil\u003c\/i\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ci\u003eOptional\u003cspan\u003e \u003c\/span\u003e\u003c\/i\u003e\u003ca title=\"Twister CAM\" href=\"\/products\/250-twister-performance-camshaft-for-gx240-to-gx390-420-predator\"\u003e\u003cb\u003eTwister Camshaft\u003c\/b\u003e\u003c\/a\u003e\n\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\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e*Note:\u003c\/b\u003e\u003cspan\u003e UT2 series Hondas (2012 \u0026amp; up) have rev limited coils and will require a new coil to exceed 4000rpm. The UT2 coils (4 wire) can only be used with stock flywheels or 6693 ARC flywheels. If using any other flywheels, you must run a UT1 style coil (single wire). Most 390 “Clone”, 420s, and 460s have UT1 style coils already (however, some Lifans and 420s have a rev-limited digital ignition).\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eThe correct jets must be selected for the application. If unsure, we recommend you check your STOCK main. If stock main is a:\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e#92-97, use a UT1 kit\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e#98-102, use a hemi kit\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u0026gt;102, use a UT2 kit\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eManufacturers have been known to use different jets on the same models, so it is important to know the stock jet size!\u003cbr\u003e\u003cbr\u003e*Picture is for reference only and may show optional parts. See above description for actual content. Header not included unless specified.\u003cbr\u003eFilter should be sprayed with a K\u0026amp;N type oil, especially in dirt applications. Oil not included\u003c\/span\u003e\u003c\/p\u003e","brand":"GoKarts USA®","offers":[{"title":"No Jet Included (Customer Must Drill Stock Jet) \/ None Included","offer_id":43110531661883,"sku":"NR-STAGE1KIT390","price":43.0,"currency_code":"USD","in_stock":true},{"title":"No Jet Included (Customer Must Drill Stock Jet) \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110531694651,"sku":"NR-STAGE1KIT390","price":113.0,"currency_code":"USD","in_stock":true},{"title":"No Jet Included (Customer Must Drill Stock Jet) \/ Add Genuine Honda UT1 Coil","offer_id":43110531727419,"sku":"NR-STAGE1KIT390","price":87.0,"currency_code":"USD","in_stock":true},{"title":"Honda UT1 Jetting Jet \/ None Included","offer_id":43110531760187,"sku":"NR-STAGE1KIT390","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Honda UT1 Jetting Jet \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110531792955,"sku":"NR-STAGE1KIT390","price":125.0,"currency_code":"USD","in_stock":true},{"title":"Honda UT1 Jetting Jet \/ Add Genuine Honda UT1 Coil","offer_id":43110531825723,"sku":"NR-STAGE1KIT390","price":99.0,"currency_code":"USD","in_stock":true},{"title":"Honda UT2 Jetting Jet \/ None Included","offer_id":43110531858491,"sku":"NR-STAGE1KIT390","price":64.0,"currency_code":"USD","in_stock":true},{"title":"Honda UT2 Jetting Jet \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110531891259,"sku":"NR-STAGE1KIT390","price":134.0,"currency_code":"USD","in_stock":true},{"title":"Honda UT2 Jetting Jet \/ Add Genuine Honda UT1 Coil","offer_id":43110531924027,"sku":"NR-STAGE1KIT390","price":108.0,"currency_code":"USD","in_stock":true},{"title":"420 Hemi Jetting \/ None Included","offer_id":43110531956795,"sku":"NR-STAGE1KIT390","price":57.0,"currency_code":"USD","in_stock":true},{"title":"420 Hemi Jetting \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110531989563,"sku":"NR-STAGE1KIT390","price":127.0,"currency_code":"USD","in_stock":true},{"title":"420 Hemi Jetting \/ Add Genuine Honda UT1 Coil","offer_id":43110532022331,"sku":"NR-STAGE1KIT390","price":101.0,"currency_code":"USD","in_stock":true},{"title":"13hp Clone Jetting \/ None Included","offer_id":43110532055099,"sku":"NR-STAGE1KIT390","price":55.0,"currency_code":"USD","in_stock":true},{"title":"13hp Clone Jetting \/ Add UT2 Coil without Rev Limiter for UT2 Honda","offer_id":43110532087867,"sku":"NR-STAGE1KIT390","price":125.0,"currency_code":"USD","in_stock":true},{"title":"13hp Clone Jetting \/ Add Genuine Honda UT1 Coil","offer_id":43110532120635,"sku":"NR-STAGE1KIT390","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/5159\/8139\/files\/STAGE1KIT390-2.png?v=1764893745","url":"https:\/\/gtcracing.com\/products\/speed-kit-for-gx340-gx390-420-predator-and-13-15hp-ohv-stage-1","provider":"GTC Racing","version":"1.0","type":"link"}