{"product_id":"vertex-wr101-109-complete-engine-rebuild-kit-kawasaki-kx85-moto-house-mx","title":"Vertex Complete Engine Rebuild Kit WR101-109 - Kawasaki KX85 2001-2004","description":"\u003ch1\u003e\u003cstrong\u003eVertex Complete Engine Rebuild Kit WR101-109 - Kawasaki KX85 2001-2004\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cdiv style=\"background-color: #fdecea; border: 1px solid #f5c2c0; border-left: 5px solid #d93025; border-radius: 6px; padding: 10px 14px; margin: 12px 0; box-sizing: border-box; width: 100%; max-width: 100%; word-wrap: break-word; overflow-wrap: break-word; font-size: 15px; line-height: 1.5;\"\u003e\n\u003cstrong style=\"color: #b3261e;\"\u003ePlease Note:\u003c\/strong\u003e \u003cspan style=\"color: #5f1a15;\"\u003eKit includes crankshaft, piston kit, complete engine gasket kit, oil seal kit, main bearing and seal kit, water pump rebuild kit, transmission bearing kit, countershaft bushing\/seal kit, and wrist pin bearing.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe Vertex WR101-109 Complete Engine Rebuild Kit provides a total mechanical overhaul package engineered specifically for 2001 to 2004 Kawasaki KX85 two-stroke minicycles. Combining every vital rotating assembly, sealing surface, and bearing set into a single box, this kit eliminates the downtime of sourcing individual OEM-level components across multiple orders. At the top end, a precision-machined \u003cstrong\u003eVertex piston kit\u003c\/strong\u003e featuring a standard compression piston, rings, wrist pin, and circlips restores factory cylinder sealing, compression ratios, and responsive throttle power across the powerband.\u003c\/p\u003e\n\u003cp\u003eThe rotating bottom-end assembly is anchored by a Hot Rods heavy-duty stock stroke crankshaft paired with a dedicated small-end wrist pin bearing. Transmission durability and smooth shifting action are supported by a complete \u003cstrong\u003eHot Rods transmission bearing kit\u003c\/strong\u003e that includes gearbox bearings, an output shaft collar, and a sprocket lock washer, as well as counter balancer bearings. A full Vertex engine gasket kit covering both top and bottom cases, complete oil seal kit, main bearings, and a water pump rebuild kit ensure complete crankcase pressure integrity and reliable coolant containment under demanding race conditions.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Vertex Complete Engine Rebuild Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAll-inclusive two-stroke engine rebuild package combining top-end and lower-end rotating components.\u003c\/li\u003e\n\u003cli\u003eVertex standard compression piston kit supplied complete with rings, wrist pin, and circlips.\u003c\/li\u003e\n\u003cli\u003eHot Rods heavy-duty stock stroke crankshaft assembly including small-end wrist pin bearing.\u003c\/li\u003e\n\u003cli\u003eComprehensive transmission bearing package featuring main bearings, counter balancer bearings, and countershaft bushing and seal kit.\u003c\/li\u003e\n\u003cli\u003eComplete top and bottom Vertex engine gasket kit with full oil seal set and water pump rebuild kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/p\u003e\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eVehicle Brand\u003c\/th\u003e\n\u003cth\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2001-2004\u003c\/td\u003e\n\u003ctd\u003eKawasaki\u003c\/td\u003e\n\u003ctd\u003eKX85\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: What main assemblies are supplied in the WR101-109 package?\u003c\/b\u003e\u003cbr\u003eA: The kit includes a Hot Rods crankshaft assembly, Vertex piston kit, complete gasket kit, oil seals, main bearings, transmission bearings, water pump rebuild kit, countershaft bushing\/seal kit, and wrist pin bearing.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does this kit change the factory engine displacement or stroke?\u003c\/b\u003e\u003cbr\u003eA: No, this kit uses a standard compression piston and a stock stroke heavy-duty crankshaft designed to maintain original 85cc factory engine specifications.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Does the transmission kit include the output shaft hardware?\u003c\/b\u003e\u003cbr\u003eA: Yes, the transmission bearing kit includes the full set of transmission bearings, the output shaft collar, and the sprocket lock washer.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eExpert Pro-Tip:\u003c\/b\u003e When performing a full crankcase split on an early KX85, avoid drawing the case halves together using the case bolts, which can misalign bearings or side-load the crankshaft webs. Use dedicated crankcase assembly tools to draw the crankshaft into the main bearings, and freeze the bearings while gently warming the aluminum cases for a smooth, drop-in fit. Always lubricate the small-end wrist pin needle bearing with quality two-stroke oil before final cylinder installation to prevent dry scuffing during initial startup.\u003c\/p\u003e\n\u003ch3\u003eRecommended Pairings:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/kawasaki-kx85-performance-upgrades-modifications-moto-house-mx\"\u003eKawasaki KX85 Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/kawasaki-kx-2-stroke-performance-parts-moto-house-mx-is-your-ultimate-destination-for-high-performance-kits-and-aftermarket-accessories\"\u003eKawasaki 2-Stroke Performance Parts\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eMotorcycle Tools Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAt Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. We pride ourselves on great customer service, and every item ships FAST - straight to your door.\u003c\/p\u003e\n\u003cp\u003e\u003ci\u003e\u003cstrong\u003eMoto-House MX - Choice of Champions\u003c\/strong\u003e - Your premier powersports source with great customer service and lightning-fast shipping straight to your door.\u003c\/i\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Vertex","offers":[{"title":"Default Title","offer_id":46250191552595,"sku":"WR101-109","price":552.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/WR101-052_1.avif?v=1789276669","url":"https:\/\/motohousemx.com\/products\/vertex-wr101-109-complete-engine-rebuild-kit-kawasaki-kx85-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}