Stage 2: 420cc Hemi Predator / GX390 Performance Kit (2024)

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  • Stage 2: 420cc Hemi Predator / GX390 Performance Kit (1)
  • Retail Price: $557.00

    $527.00

    (You save $30.00 )

    (10 reviews)

    SKU:
    420S2
    • Overview
    • Reviews

    Product Description

    The Stage 2: 420cc Hemi Predator / GX390 Performance Kit is a high-quality upgrade kit that will improve the performance of your engine. This kit includes a range of high-quality components that are specifically designed to work together to increase horsepower, torque, and overall engine performance. The kit includes a Billet Flywheel, Billet Connecting Rod, Dual Valve Spring Set, Side Cover Gasket, Spark Plug, and your choice of Performance Ground Cam - either DJ-3114 .275 Cam or DJ-3112 .308 Cam. These components are made from high-quality materials that can withstand high temperatures and pressure, ensuring long-lasting performance and durability. The installation process is easy, and the kit will provide an exact match for your engine. After installing the Stage 2: 420cc Hemi Predator / GX390 Performance Kit, you can expect improved acceleration, increased top speed, and overall better engine performance. Whether you're using your engine for racing, off-roading, or just for fun, this performance kit is a reliable and cost-effective solution that will help take your engine to the next level.

    *NO PART SUBSTITUTIONS*

    This performance kit fits the Hemi Predator 420cc and the Honda GX340-GX390 engines.

    Our stage 2 performance kit will take your gokart or mini bike to the next level and provide you with tons of horsepower.

    Kit includes:

    • 6623 Billet Flywheel
    • 6272 Billet Connecting Rod
    • DJ-3055DS Dual Valve Spring Set
    • Side Cover Gasket
    • 3910X Spark Plug
    • Your choice of Performance Ground Cam:
      • DJ-3114.275 Cam
      • DJ-3112 .308 Cam

    No returns on this product, if you have any questions, please call before ordering.

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    Stage 2: 420cc Hemi Predator / GX390 Performance Kit (2)

    Stage 2: 420cc Hemi Predator / GX390 Performance Kit

    10 Reviews Hide Reviews Show Reviews

    • 5
      Can I use on non hemi?

      Posted by Charles Whitcomb on 4th Jan 2024

      I have a greyhound 66555 420cc non-hemi, will this kit work?

    • 5
      So it says I can save $300 if I spend over $500...

      Posted by Mason on 26th Mar 2023

      So it says I can save $300 if I spend over $500 but when I apply the promo code it doesn't give me the discount

    • 5
      440...

      Posted by wormie on 6th Sep 2022

      will 420 parts fit in a 440 aftermarket rod

    • 5
      Love the kit! Only thing that would have been...

      Posted by Jeff M. on 11th Jul 2022

      Love the kit! Only thing that would have been nice while ordering is to have the 12 point 5/16 socket for the new connecting rod. I have a pretty extensive set of sockets but not the 12 point. Other than that can't wait to get it finished!

    • 5
      Stage 2: 420cc Hemi Predator / GX390 Performance...

      Posted by Melanie Dupard on 8th Jul 2022

      Stage 2: 420cc Hemi Predator / GX390 Performance Kit

    • 5
      Great...

      Posted by Steven BudZisz on 9th Oct 2021

      Awesome kit with all you need

    • 5
      Gps has what we...

      Posted by Mason Pittman on 1st Oct 2021

      Gopowersports always has all the parts and accessories that the Misfits know and trust this kid really gave my 460 Tillson Wildcat motor some more spunk definitely a great upgrade from the stock internals.

    • 5
      420 stage 2...

      Posted by Roy Okeefe on 29th Aug 2021

      Awsome boost to my 420 project. Fast delivery. Love go power sports

    • 5
      Stage 2: 420cc Hemi Predator / GX390 Performance...

      Posted by Richard Rose on 14th Aug 2021

      Stage 2: 420cc Hemi Predator / GX390 Performance Kit

    ×

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    ×

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    `var v2_in_cart_crosssell_block_html = `

    `var v2_in_cart_recommendation_block_html = `

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    '); $('head').append('

    '); $('head').append('

    '); } else if(v2_position === 3) { $('head').append('

    '); $('head').append('

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    '); $('head').append('

    ') } v2_req_data = { id: v2_product_id, store_hash: v2_store_hash, position: v2_position, trigger_product_ids: v2_trigger_product_ids, products_in_cart: v2_products_in_cart, currency_code: v2_currency_code, screen_width: $(window).width(), is_user_logged_in: v2_is_user_logged_in, user_token: v2_token_user, trigger_variant_ids: v2_trigger_variant_ids, }; $.getScript("https://recommender.peasisoft.com/storefront/js/popup-widget.js", () => { $.get({ url: '/customer/current.jwt?app_client_id=ssearhvcx7ny3fefhmjhsqezf55stq1', success: function (response) { v2_req_data.is_user_logged_in = 1 v2_req_data.user_token = response getPopupContent(); }, error: function (error) { console.log('failed to get current user') console.log(error); getPopupContent(); } }) function getPopupContent(){ console.log('get carts') $.get('/api/storefront/carts', function(cart_data) { if (cart_data && cart_data.length > 0) { v2_cart_id = cart_data[0]['id']; v2_cart_items = cart_data[0]["lineItems"]["physicalItems"].concat(cart_data[0]["lineItems"]["digitalItems"]); v2_req_data.products_in_cart = v2_cart_items; v2_req_data.trigger_product_ids = v2_cart_items.map(x => x.productId); localStorage.setItem('v2_cart_items', v2_req_data.trigger_product_ids) if (localStorage.getItem('v2_offer_showed')) { return false } localStorage.removeItem('offer_showed') v2_req_data.trigger_variant_ids = v2_cart_items.map(x => x.variantId); localStorage.setItem('v2_variant_ids', v2_req_data.trigger_variant_ids); } if (v2_position === 3 && localStorage.getItem('v2_cart_items')) { v2_req_data.trigger_product_ids = localStorage.getItem('v2_cart_items').split(",") v2_req_data.products_in_cart = v2_req_data.trigger_product_ids.slice() localStorage.removeItem('v2_cart_items') v2_req_data.trigger_variant_ids = localStorage.getItem('v2_variant_ids').split(",") localStorage.removeItem('v2_variant_ids') } v2_dest_currency_code = $('.body').attr('data-currency-code'); if (typeof v2_dest_currency_code !== "undefined" && v2_dest_currency_code !== v2_base_currency_code) { localStorage.setItem('v2_dest_currency_code', v2_dest_currency_code); } else if (typeof v2_dest_currency_code !== "undefined" && v2_dest_currency_code === v2_base_currency_code) { v2_dest_currency_code = v2_base_currency_code; localStorage.setItem('v2_dest_currency_code', v2_dest_currency_code); } else { if (localStorage.getItem('v2_dest_currency_code') && localStorage.getItem('v2_dest_currency_code') !== v2_base_currency_code) { v2_dest_currency_code = localStorage.getItem('v2_dest_currency_code'); } else { v2_dest_currency_code = v2_base_currency_code; } } v2_req_data.currency_code = v2_dest_currency_code; if ((v2_req_data.trigger_product_ids.length < 1 && v2_product_id == null) || v2_position === 0) { console.log('Request data invalid. 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Request time: ", new Date().getTime() - v2_start_time); }, error: function(res) { v2_loading = false; let v2_subStrings = res.templateName.split("-"); if(v2_subStrings[1] === 'page' && v2_subStrings[2] === 'crosssell'){ $('#ult-upsell-native-block').html(res.responseText); }else if(v2_subStrings[2] === 'bundle'){ $('#ult-upsell-native-bundle-block').html(res.responseText); }else if(v2_subStrings[2] === 'product_recommendation'){ $('#purchase-product-recommendation-block').html(res.responseText); }else if(v2_subStrings[1] === 'purchase' && v2_subStrings[2] === 'crosssell'){ $('#purchase-crosssell-block').html(res.responseText); }else if(v2_subStrings[1] === 'cart' && v2_subStrings[2] === 'crosssell'){ $('#in-cart-crosssell-block').html(res.responseText) }else if(v2_subStrings[2] === 'discount_quantity'){ $('#ult-upsell-native-qty-discount-block').html(res.responseText); }else if(v2_subStrings[1] === 'cart' && v2_subStrings[2] === 'product_recommendation'){ $('#in-cart-product-recommendation-block').html(res.responseText); } console.log("(v2) Error occured. Request time: ", new Date().getTime() - v2_start_time); }, }); }) }) } })});

    Stage 2: 420cc Hemi Predator / GX390 Performance Kit (2024)

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