{"product_id":"parts-camp-gx390-muffler-exhaust-assembly-fits-gx340-gx390-gx420-engines-11-16-hp","title":"Parts Camp GX390 Muffler Exhaust Assembly – Fits GX340 GX390 GX420 Engines (11–16 HP)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Parts Camp GX390 muffler assembly is a purpose-built replacement designed for Honda GX340, GX390, and GX420 engine families. It also suits popular 420cc Predator and Champion engines, offering a reliable path to restore exhaust performance without guessing at compatibility.\u003c\/p\u003e\n\n\u003ch3\u003eWhat’s included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 muffler\u003c\/li\u003e\n  \u003cli\u003e1 head shield manifold\u003c\/li\u003e\n  \u003cli\u003e2 gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOEM references and fit\u003c\/h3\u003e\n\u003cp\u003eThis muffler replaces OEM part 18310-ZE2-W61 and Stens 105-705, ensuring a familiar mounting footprint and seal geometry for straightforward installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhy this matters\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatibility across engine models widens service options for repair shops and DIY enthusiasts alike.\u003c\/li\u003e\n  \u003cli\u003eAll-in-one kit reduces the need to source multiple separate parts, saving time during repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerformance and design notes\u003c\/h3\u003e\n\u003cp\u003eThe muffler’s shielded head manifold helps manage heat around the exhaust area, while the exhaust path is designed to balance backpressure and flow characteristics. These design cues support steady operation and can help maintain typical engine performance within the expected range for these powertrains.\u003c\/p\u003e\n\n\u003ch3\u003eReal-life use cases\u003c\/h3\u003e\n\u003cp\u003eIdeal for mid-season replacements, preventative maintenance, or swap-outs during on-site tune-ups. The setup works well for engines in tractors, small equipment frames, and generator platforms relying on GX\/Predator\/Champion powertrains.\u003c\/p\u003e\n\n\u003ch3\u003eWhat to expect from support\u003c\/h3\u003e\n\u003cp\u003eParts Camp offers responsive service; a team member will reply within 24 hours for purchase questions or installation guidance.\u003c\/p\u003e\n\n\u003ch3\u003eCare and installation tips\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eInspect mounting points for wear before installation.\u003c\/li\u003e\n  \u003cli\u003eReplace gaskets when reassembling to maintain a proper seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What engines is the Parts Camp GX390 Muffler Assembly compatible with?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Compatible with Honda GX340, GX390, GX420, as well as Harbor Freight Predator 420cc and Champion 389cc\/420cc\/439cc engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What comes in the package for the GX390 muffler?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Includes 1 muffler, 1 head shield manifold, and 2 gaskets; OEM reference 18310-ZE2-W61 and Stens 105-705.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Parts Camp","offers":[{"title":"Default Title","offer_id":42470102761557,"sku":"B06WD4CMKZ","price":65.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/parts-camp-gx390-muffler-exhaust-unit.jpg?v=1778118503","url":"https:\/\/plentytorque.co.uk\/products\/parts-camp-gx390-muffler-exhaust-assembly-fits-gx340-gx390-gx420-engines-11-16-hp","provider":"PlentyTorque","version":"1.0","type":"link"}