{"product_id":"bpratv-416cc-big-bore-kit-honda-trx400ex-trx400x-xr400","title":"TRX400EX TRX 400X XR400 87mm Big Bore 11:1 High Comp Piston Stage 2 Hot Cams Kit","description":"\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 0.000000px; color: transparent;\"\u003eComplete Honda TRX400EX 416cc big bore rebuild kit with 87mm piston, Stage 2 camshaft, Cometic gaskets, and upgraded components for maximum performance. \u003c\/span\u003e\u003c\/p\u003e\u003cdiv style=\"max-width:800px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;line-height:1.5;color:#222;\"\u003e \u003ch2 style=\"text-align:center;font-size:26px;margin:0 0 12px 0;\"\u003e \u003cstrong\u003eBPRATV 87mm 416cc Big Bore Kit 11:1 Piston Stage 2 Hot Cams Honda TRX400EX TRX400X XR400\u003c\/strong\u003e \u003c\/h2\u003e \u003cdiv style=\"max-width:800px;margin:15px auto 20px auto;padding:18px 20px;background-color:#000;border-radius:6px;text-align:center;\"\u003e \u003cspan style=\"color:#ffffff;font-size:18px;line-height:1.6;\"\u003e \u003cstrong\u003eNo one else sells more Honda TRX400EX Big Bore Kits (416cc, 426cc, 440cc) — built with the best parts in the industry — at the best price, in stock, and shipped fast.\u003c\/strong\u003e \u003c\/span\u003e \u003c\/div\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e📖 Product Description\u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e Take your \u003cstrong\u003eHonda TRX400EX, TRX400X, or XR400\u003c\/strong\u003e to the next level with this complete \u003cstrong\u003eBPRATV 87mm 416cc Big Bore Top End Rebuild Kit\u003c\/strong\u003e. Designed for serious riders and builders, this kit delivers a massive performance upgrade with increased displacement, higher compression, and a \u003cstrong\u003eStage 2 Hot Cams camshaft\u003c\/strong\u003e for aggressive power gains across the RPM range. \u003c\/span\u003e \u003c\/p\u003e\n\u003cp style=\"text-align:center;margin:0 20px;\"\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e Featuring a \u003cstrong\u003eforged 11:1 high compression piston\u003c\/strong\u003e, premium \u003cstrong\u003eCometic MLS gaskets\u003c\/strong\u003e, and upgraded internal components, this kit is engineered for durability, reliability, and maximum output. Whether you're rebuilding or upgrading, this is one of the most complete and performance-driven kits available for the legendary Honda 400 platform. \u003c\/span\u003e \u003c\/p\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e🔥 Key Features \u0026amp; Benefits\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003e87mm big bore cylinder\u003c\/strong\u003e increases displacement to 416cc for major power gains\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003e11:1 forged piston\u003c\/strong\u003e improves compression and throttle response\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eStage 2 Hot Cams camshaft\u003c\/strong\u003e delivers stronger mid-range and top-end power\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eCometic MLS head gasket\u003c\/strong\u003e ensures superior sealing under high performance conditions\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eSKF cam bearings upgrade\u003c\/strong\u003e for increased durability and reliability\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eHeavy duty cam chain\u003c\/strong\u003e reduces stretch and improves timing stability\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eTitanium head stud kit\u003c\/strong\u003e provides superior clamping strength\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eCompatible with pump or race gas\u003c\/strong\u003e for versatile performance setups\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e📦 Product Contents\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eBPRATV 87mm big bore cylinder (1-year warranty)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eStage 2 Hot Cams camshaft\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eSKF upgraded camshaft bearings (Both)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e87mm 11:1 forged piston (Wiseco \/ Wossner \/ CP \/ or JE)*\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003ePiston rings\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eWrist pin\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eCirclips\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eCometic top end gasket kit\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eMLS big bore head gasket\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eViton valve stem seals\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eBPRATV heavy duty cam chain\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eBPRATV Talon titanium cylinder head stud kit\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003eNGK spark plug\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e✅ Compatibility\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eHonda TRX400EX\u003c\/strong\u003e (1999–2008)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eHonda TRX400X\u003c\/strong\u003e (2009–2014)\u003c\/span\u003e\u003c\/li\u003e \u003cli\u003e\u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eHonda XR400 \/ XR400R\u003c\/strong\u003e (1996–2004)\u003c\/span\u003e\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e❓ FAQ\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What displacement does this kit create?\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This 87mm big bore kit increases engine size to approximately \u003cstrong\u003e416cc\u003c\/strong\u003e.\u003c\/span\u003e \u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I run pump gas with this setup?\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the \u003cstrong\u003e11:1 compression piston\u003c\/strong\u003e is designed to run on pump or race gas.\u003c\/span\u003e \u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this a complete top end rebuild kit?\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, it includes the cylinder, piston kit, camshaft, gaskets, seals, chain, bearings, and hardware needed for a full top end rebuild.\u003c\/span\u003e \u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Are all parts new and ready to install?\u003c\/span\u003e \u003cp style=\"text-align:left;margin:0 0 10px 0;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, all components are brand new and come in original packaging with applicable manufacturer warranties.\u003c\/span\u003e \u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;margin:20px 0 6px;text-align:center;\"\u003e🌟 Why Buy from BPRATV\u003c\/h3\u003e \u003cp style=\"color: rgb(34, 34, 34); text-align: center;\"\u003e \u003cspan style=\"font-size:16px;\"\u003e At \u003cstrong\u003eBPRATV\u003c\/strong\u003e, our promise is unwavering: \u003cstrong\u003eThe Best Parts. The Best Performance. The Best Price.\u003c\/strong\u003e We specialize in high-performance powersports components trusted by riders and builders who demand reliability and results. Every part is carefully selected for precision, durability, and real-world performance. Trust BPRATV to keep your \u003cstrong\u003eHonda TRX400EX, TRX400X, and XR400\u003c\/strong\u003e running at its best, \u003cstrong\u003eevery single time.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 20px;\"\u003e \u003cspan style=\"color:#38761d;font-size:16px;\"\u003e \u003cstrong\u003e\u003cem\u003eUnleash serious power with this 416cc big bore performance kit — order today!\u003c\/em\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"text-align:center;\"\u003e \u003cspan style=\"color:#0000ff;font-size:16px;\"\u003e \u003cstrong\u003eBPRATV - The Best Parts. The Best Performance. The Best Price.\u003c\/strong\u003e \u003c\/span\u003e \u003c\/p\u003e \u003cp style=\"text-align:center;\"\u003e \u003cspan style=\"color:#0000ff;font-size:16px;\"\u003e \u003cstrong\u003eBRAPPPPPPPPPP!\u003c\/strong\u003e \u003c\/span\u003e \u003c\/p\u003e \u003cp style=\"text-align:center;font-size:10px;color:#555;margin:20px 0 50px;\"\u003e© BPRATV LLC\u003cbr\u003e\u003cbr\u003e Due to the nature of high performance and racing applications, BPRATV LLC components are sold without express warranty or any implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not, under any circumstances, be liable for any specific, incidental or consequential damages, including, but not limited to, damage, or loss of property or equipment, loss of profits or revenue(s), cost of purchased or replacement goods, or claims of customers of the purpose, which may arise and\/or shall result from sale, installation or use of these parts. Installation of these parts may void vehicle manufacturers warranty coverage and\/or may cause the vehicle to be illegal in some locations.\u003cbr\u003e\u003cbr\u003e This product is exempt from the emission standards and related requirements of 40 C.F.R. §1051 as provided by 40 C.F.R. §1051.620, and California law. This product is sold only for use in connection with EPA-certified, purpose-built, nonroad vehicles used solely for closed-course, nonroad competition\/racing.\u003c\/p\u003e \u003c\/div\u003e \u003c!-- eBay Titles 1999-2014 Honda TRX400EX TRX400X 416cc 87mm Big Bore Kit Stage 2 Hot Cams BPRATV 87mm 416cc Big Bore Kit Stage 2 Cam Honda TRX400EX TRX400X XR400 Honda TRX400EX 416cc Big Bore Rebuild Kit 87mm 11:1 Piston Stage 2 Cam TRX400X XR400 87mm Big Bore 416cc Kit Stage 2 Hot Cams Piston Gasket Set Honda TRX400EX Engine Rebuild Kit 416cc Big Bore 87mm Stage 2 Camshaft High Performance 416cc Big Bore Kit Honda TRX400EX TRX400X XR400 Stage 2 BPRATV 87mm Big Bore Cylinder Kit 416cc Honda TRX400EX XR400 Stage 2 Cam Honda XR400 TRX400EX 416cc Big Bore Kit 11:1 Piston Hot Cams Stage 2 Kit TRX400EX TRX400X Engine Rebuild Kit 87mm Big Bore 416cc Stage 2 Camshaft 87mm 416cc Big Bore Rebuild Kit Honda TRX400EX XR400 Stage 2 Hot Cams eBay Keywords trx400ex big bore kit trx400x rebuild kit xr400 big bore piston trx400 engine rebuild 416cc big bore kit trx400 piston kit trx400 camshaft upgrade xr400 rebuild kit trx400 cylinder kit trx400 performance parts SEO Keywords honda trx400ex big bore kit 416cc trx400x engine rebuild kit 87mm xr400 big bore piston kit 11:1 trx400ex stage 2 camshaft kit honda trx400 performance rebuild trx400 cylinder piston gasket kit xr400 engine rebuild performance kit trx400ex hot cams stage 2 kit 416cc trx400 big bore rebuild kit trx400x piston cylinder upgrade Meta Titles Honda TRX400EX 416cc Big Bore Kit 87mm Stage 2 Hot Cams Rebuild Kit TRX400X XR400 87mm Big Bore 416cc Engine Rebuild Kit Stage 2 Camshaft BPRATV 416cc Big Bore Kit Honda TRX400EX XR400 87mm Piston Cam Kit Honda TRX400EX Engine Rebuild Kit 416cc Big Bore Stage 2 Camshaft TRX400X 416cc Big Bore Kit 87mm Piston Hot Cams Stage 2 Upgrade XR400 Engine Rebuild Kit 416cc Big Bore Piston Camshaft Kit Honda TRX400EX Performance 416cc Big Bore Rebuild Kit Stage 2 Cam TRX400 Engine Rebuild Kit 87mm Big Bore 416cc Piston Camshaft Honda XR400 416cc Big Bore Kit 87mm Stage 2 Camshaft Upgrade TRX400EX TRX400X 416cc Engine Kit Big Bore Piston Camshaft Meta Descriptions Complete Honda TRX400EX 416cc big bore rebuild kit with 87mm piston, Stage 2 camshaft, Cometic gaskets, and upgraded components for maximum performance. Upgrade your TRX400X or XR400 with this 416cc big bore kit including forged piston, camshaft, gasket kit, and heavy duty engine components. High performance 87mm big bore kit for Honda TRX400EX with Stage 2 camshaft, forged piston, MLS gaskets, and complete top end rebuild parts. Honda XR400 TRX400 engine rebuild kit with 416cc big bore cylinder, 11:1 piston, camshaft, bearings, seals, and full gasket kit included. Restore and upgrade your TRX400EX engine with this complete 416cc big bore rebuild kit featuring premium performance components. Full 87mm big bore engine kit for Honda TRX400EX and XR400 with forged piston, camshaft, gaskets, and heavy duty timing components. TRX400X engine rebuild kit with 416cc big bore piston, cylinder, camshaft, gasket kit, and performance upgrade components. Honda TRX400EX 416cc performance rebuild kit with Stage 2 camshaft, forged piston, and complete top end components. XR400 big bore engine kit with 87mm piston, camshaft, bearings, seals, and full gasket set for reliable performance. TRX400 engine upgrade kit with 416cc big bore cylinder, piston, camshaft, and premium rebuild components. SEO URL Handles bpratv-416cc-big-bore-kit-honda-trx400ex-trx400x-xr400 trx400ex-87mm-big-bore-engine-rebuild-kit-stage-2-cam honda-xr400-416cc-big-bore-piston-cylinder-kit-performance trx400x-engine-rebuild-kit-416cc-big-bore-stage-2-cam honda-trx400ex-performance-big-bore-kit-87mm-complete --\u003e","brand":"BPRATV","offers":[{"title":"Default Title","offer_id":44453729435845,"sku":"284354588648","price":799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/1083\/3861\/files\/TRX400EXTRX400XXR400BIGBORE1043-2HOTCAMSHONDABPRATV-1.png?v=1738882999","url":"https:\/\/bpratv.com\/products\/bpratv-416cc-big-bore-kit-honda-trx400ex-trx400x-xr400","provider":"BPRATV","version":"1.0","type":"link"}