https://completepartskit.com Sun, 14 Jun 2026 19:32:39 +0000 en-US hourly 1 https://wordpress.org/?v=4.1.1 https://completepartskit.com/99-04-trx-400ex-big-bore-89-mil-complete-rebuilt-motor-engine-rebuild-parts-kit/ https://completepartskit.com/99-04-trx-400ex-big-bore-89-mil-complete-rebuilt-motor-engine-rebuild-parts-kit/#comments Fri, 26 Dec 2025 02:14:51 +0000 https://completepartskit.com/99-04-trx-400ex-big-bore-89-mil-complete-rebuilt-motor-engine-rebuild-parts-kit/






FITS ALL 99-04 HONDA TRX400EX SPORTRAX MODELS. NEW 89mm after market cylinder. CP JE or Wiseco forged hi comp pump gas piston. Hi temp piston rings. Hotrods or Wiseco crankshaft with rod. MLS big bore head gasket. Complete crankcase oil seal kit. Everything is new in the original packaging. PRICES AND LISTINGS ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE. DO YOU MAKE A LIVING WORKING ON BIKES? ARE YOU A SHOP OR DEALER. PRICES ARE SUBJECT TO CHANGE AND LISTINGS MAY BE REVISED AT ANY TIME WITHOUT NOTICE. At BPRATV we sell parts from the best names in the industry. Unless otherwise stated, we will put the quality of the parts we sell up against any other companies’ in the industry. Also, we stock the same parts from different manufacturers so that when back orders occur like they have been for the last year we have an alternate part to send that is the same quality. This would be the ONLY reason your order might be slightly different when it arrives. If you want a certain brand part just ask (if part is back ordered this may cause a delay on your order). 99% of problems can be easily solved without returning the entire order. Once items have been modified, installed, or used in any way they are not eligible for return. This product is NOT DIY. Over 99% of people in the world are not qualified to build an engine. It requires special tools and has to be done 100% correct. Many parts must be measured down to. We ALWAYS STRONGLY recommend parts be installed by a qualified, experienced mechanic. It is the responsibility of the person assembling and tuning the parts to make sure they work correctly. If it can not be fixed we will supply you with a new one. It must be sent to us for inspection, and Millennium Technologies will determine if the cylinder is repairable. Also, we want information from customers when their experience is less than desirable so we know what areas need improvement the most. Please work with us and we will ALWAYS work with you.

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FITS ALL 99-04 HONDA TRX400EX SPORTRAX MODELS. NEW after market cylinder. CP JE or Wiseco forged piston. Hi temp piston rings. Hotrods or Wiseco crankshaft with rod. Complete gasket kit – head base intake exhaust case covers pump covers orings. Complete crankcase oil seal kit. DUE TO CONSTANT BACK ORDERS FROM MANUFACTURERS CAUSED BY COVID WE STOCK THE SAME 400EX PARTS FROM DIFFERENT COMPANIES SO THAT WHEN, NOT IF, ONE IS ON BACK ORDER WE HAVE AN ALTERNATE THAT IS THE SAME QUALITY TO SEND SO YOUR ORDER CAN GO OUT. This is a bolt on kit that requires no machining of any kind. Runs on pump or race gas. All parts are new in the original packaging, and the original manufacturers’ warranties apply. Please check your order thoroughly when receiving it. We recommend that this kit be installed by a qualified mechanic with experience working on these types of motors. Piston comes with specific instructions for setting the ring gap. If you do not follow these exactly your motor will fail. The item “99-04 TRX 400EX Complete Rebuilt Motor Engine Rebuild Top Bottom End Parts Kit” is in sale since Saturday, July 3, 2021. This item is in the category “eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components”. The seller is “bpracingatv” and is located in Upland, California. This item can be shipped worldwide.

• Modified Item: Yes
• Custom Bundle: Yes
• Surface Finish: Forged
• Manufacturer Part Number: 13000-KCY-672 12100-KCY-670 13101-KCY-670
• Modification Description: xr400 complete engine
• Placement on Vehicle: Left
• Brand: P Racing ATV CP JE Honda Hotrods Cometic
• Warranty: Yes
• Bundle Description: XR400 complete rebuild

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NEED TO REBUILD YOUR MOTOR? THIS IS WHAT YOU NEED! FITS ALL HONDA TRX400EX/X YEARS AND MODELS! 10:1 Wiseco forged piston. Wiseco hi temp rings, DLC wrist pin, and clips. Hotrods heavy duty crank. Hotrods HD main bearings. ARP 12 point flange nuts and washers. Complete top and bottom end gasket kit – head base exhaust crankcase. Complete crankcase oil seal kit. Clutch kit – fibers steels springs. No mods are required. We recommend that this be installed by a qualified mechanic with experience doing this type of work. The item “400EX Rebuild Rebuilt Motor Parts Kit Complete JE Wiseco Hotrods Crank Cylinder” is in sale since Friday, December 27, 2019. This item is in the category “eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components”. The seller is “bpracingatv” and is located in Upland, California. This item can be shipped worldwide.

• Country/Region of Manufacture: United States
• Manufacturer Part Number: 90085-KCY-670 12100-KCY-670 14401-KCY-671 13011-KC
• Brand: Wiseco BP Racing ATV ARP KMS Honda
• Warranty: Yes

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