{"product_id":"speed-kit-for-honda-gx390-racing-karts-choose-options-stage-4","title":"Speed Kit For Honda GX390 Racing Karts - (Choose Options) Stage 4","description":"\u003cdiv\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\/div\u003e\n\u003cdiv\u003eThe Stage 4 kit starts with a package similar to that of the\u003cspan\u003e \u003c\/span\u003e\u003cb\u003eStage \u003c\/b\u003e\u003cb\u003e3\u003c\/b\u003e, but adds a ported and milled head with stainless valves, a stud kit, and heavy duty valve train components. Allows up to 35+ HP out of a GX390.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cb\u003eKit Includes:\u003c\/b\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eFully Ported and Milled Race Head\u003c\/li\u003e\n\u003cli\u003eHigh-Torque Genuine Honda Core\u003cspan\u003e \u003c\/span\u003e\u003ci\u003e(The Best!!)\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-Flow 36mm \/ 31mm Valves with Lash Caps\u003c\/li\u003e\n\u003cli\u003eDual Springs with Titanium Retainers\u003c\/li\u003e\n\u003cli\u003e307 Race Cam\u003c\/li\u003e\n\u003cli\u003eBlack Venom Aluminum Roller Rockers\u003c\/li\u003e\n\u003cli\u003eValve Cover Spacer\u003c\/li\u003e\n\u003cli\u003eChrome Moly Pushrods\u003c\/li\u003e\n\u003cli\u003eChoice of Carbs\u003cspan\u003e \u003c\/span\u003e\u003ci\u003e(Or use your own)\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli\u003e88mm Forged Flat-Top Piston with Rings\u003c\/li\u003e\n\u003cli\u003eBillet Rod (+.040\" Longer)\u003c\/li\u003e\n\u003cli\u003eOffset Timing Key\u003c\/li\u003e\n\u003cli\u003eCarb, Insulator, Head, and Case Gaskets\u003c\/li\u003e\n\u003cli\u003eARP Bolt Kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e*Note:\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003eThis kit only fits 389cc (88mm) engines. Kit is intended for experienced engine builders. Some clearancing, fitment, or other engine building \"tricks\" may be needed. Picture is for reference only. See above description for actual content. Filter should be sprayed with K\u0026amp;N type oil, especially in dirt applications. Billet aluminum flywheel required.\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eUT2 series Hondas (2012 \u0026amp; up) or 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 6693 billet flywheel. If using another billet flywheel, you must run a UT1 style coil (single wire).\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e13\/15 Chinese engines (414, 420, 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\u003e\u003ci\u003e\u003c\/i\u003e\u003c\/span\u003e\u003cspan\u003e\u003ci\u003eDue to the head work required for this kit, please allow 1 week to ship.\u003c\/i\u003e\u003c\/span\u003e\n\u003c\/div\u003e","brand":"GoKarts USA®","offers":[{"title":"No Carburetor (Customer to Supply Carb) \/ No Flywheel","offer_id":43060116062267,"sku":"NR-STAGE4KIT390","price":1110.0,"currency_code":"USD","in_stock":true},{"title":"No Carburetor (Customer to Supply Carb) \/ Add Aluminum Flywheel - Recoil Start","offer_id":43060116095035,"sku":"NR-STAGE4KIT390","price":1345.0,"currency_code":"USD","in_stock":true},{"title":"No Carburetor (Customer to Supply Carb) \/ Add Aluminum Flywheel - Electric Start","offer_id":43060116127803,"sku":"NR-STAGE4KIT390","price":1403.0,"currency_code":"USD","in_stock":true},{"title":"34mm Round Slide Mikuni - Gas \/ No Flywheel","offer_id":43060116160571,"sku":"NR-STAGE4KIT390","price":1373.0,"currency_code":"USD","in_stock":true},{"title":"34mm Round Slide Mikuni - Gas \/ Add Aluminum Flywheel - Recoil Start","offer_id":43060116193339,"sku":"NR-STAGE4KIT390","price":1539.0,"currency_code":"USD","in_stock":true},{"title":"34mm Round Slide Mikuni - Gas \/ Add Aluminum Flywheel - Electric Start","offer_id":43060116226107,"sku":"NR-STAGE4KIT390","price":1596.0,"currency_code":"USD","in_stock":true},{"title":"34mm Flat Slide Mikuni Gas \/ No Flywheel","offer_id":43060116258875,"sku":"NR-STAGE4KIT390","price":1413.0,"currency_code":"USD","in_stock":true},{"title":"34mm Flat Slide Mikuni Gas \/ Add Aluminum Flywheel - Recoil Start","offer_id":43060116291643,"sku":"NR-STAGE4KIT390","price":1579.0,"currency_code":"USD","in_stock":true},{"title":"34mm Flat Slide Mikuni Gas \/ Add Aluminum Flywheel - Electric Start","offer_id":43060116324411,"sku":"NR-STAGE4KIT390","price":1636.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Gas \/ No Flywheel","offer_id":43060116357179,"sku":"NR-STAGE4KIT390","price":1515.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Gas \/ Add Aluminum Flywheel - Recoil Start","offer_id":43060116389947,"sku":"NR-STAGE4KIT390","price":1681.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Gas \/ Add Aluminum Flywheel - Electric Start","offer_id":43060116422715,"sku":"NR-STAGE4KIT390","price":1738.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Methanol \/ No Flywheel","offer_id":43060116455483,"sku":"NR-STAGE4KIT390","price":1621.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Methanol \/ Add Aluminum Flywheel - Recoil Start","offer_id":43060116488251,"sku":"NR-STAGE4KIT390","price":1787.0,"currency_code":"USD","in_stock":true},{"title":"33mm Mikuni Pumper Methanol \/ Add Aluminum Flywheel - Electric Start","offer_id":43060116521019,"sku":"NR-STAGE4KIT390","price":1844.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/5159\/8139\/files\/STAGE4KIT390-2_534ed30b-4a1c-4a60-94df-c894091562cd.png?v=1764893759","url":"https:\/\/gtcracing.com\/products\/speed-kit-for-honda-gx390-racing-karts-choose-options-stage-4","provider":"GTC Racing","version":"1.0","type":"link"}