{"product_id":"rotax-max-125-junior-2026-evo","title":"Rotax 125 Max Junior Evo","description":"\u003cp\u003eThe Rotax 125 Junior Max EVO is the latest model in a long line since Rotax manufactured its very first kart engine more than 40 years ago.\u003c\/p\u003e\n\u003cp\u003eRotax has always focused fully on delivering an exciting and affordable driving experience combined with excellent reliability.\u003c\/p\u003e\n\u003cp\u003eRotax is actually the only manufacturer in the world offering a factory warranty on their racing engines – proof of the high quality these hand-built engines from Austria deliver.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnology:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWith the Rotax 125 Junior Max EVO, you get everything you could ask for from a modern kart engine:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReliable electric start with long battery life\u003c\/li\u003e\n\u003cli\u003eOfficial apps that help you perfectly fine-tune your engine\u003c\/li\u003e\n\u003cli\u003eEngine management (ignition and more) is fully controlled by the engine ECU (Electronic Control Unit), ensuring perfect results every time\u003c\/li\u003e\n\u003cli\u003eAll components are manufactured in-house at Rotax’s state-of-the-art factory in Austria\u003c\/li\u003e\n\u003cli\u003eThe engines offer very long service intervals – up to 50 hours of operation, which is significantly longer than all comparable competitors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEngine Components:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCrankcase:\u003c\/strong\u003e The crankcase is manufactured from injection-molded aluminum.\u003c\/p\u003e\n\u003cp\u003eMolten aluminum is injected into a mold under pressure exceeding 15 bar. The high pressure guarantees a strong and solid casting with perfect results.\u003c\/p\u003e\n\u003cp\u003eAfter casting, the crankcase is machined by computer-controlled milling machines with extremely high precision. The entire crankcase is then powder-coated with a durable surface finish.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePiston and Cylinder:\u003c\/strong\u003e The cylinders are also cast in aluminum before being CNC-machined to achieve the smoothest and most precise result possible.\u003c\/p\u003e\n\u003cp\u003eThe cylinder bore is Nikasil-coated. Nikasil is one of the hardest surface treatments available and offers near-unlimited durability.\u003c\/p\u003e\n\u003cp\u003eAnother major advantage of Nikasil is that only a 2% oil mixture is required, which is better for both the environment and your wallet.\u003c\/p\u003e\n\u003cp\u003eThe piston is manufactured from forged aluminum and coated with a Teflon surface after machining. This increases durability and provides the best possible performance through reduced friction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCooling:\u003c\/strong\u003e All Rotax engines feature a closed water-cooling system that operates without external water pumps. The high flow rate and large aluminum radiator ensure the correct operating temperature (50–60°C) even during demanding driving conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIgnition:\u003c\/strong\u003e The ignition system is digital and fully electronically controlled by the engine’s ECU. With the help of a sensor located at the crankshaft, you are guaranteed precise ignition timing every time. You also benefit from a variable ignition curve that automatically adapts to engine RPM for maximum performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eClutch:\u003c\/strong\u003e The clutch, manufactured from hardened steel, transfers engine power to the drive chain and then to the rear axle.\u003c\/p\u003e\n\u003cp\u003eThe clutch is normally maintenance-free and lasts for several years. The engine sprocket is mounted inside the clutch drum, allowing you to quickly change gearing in less than a minute.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCarburetor \u0026amp; Fuel:\u003c\/strong\u003e A powerful vacuum-operated fuel pump delivers fuel to a 34 mm Dellorto carburetor specially developed for the Rotax engine.\u003c\/p\u003e\n\u003cp\u003eThe carburetor can be adjusted by changing jets and adjusting the throttle needle. Information about recommended jetting is provided through the Rotax App, which uses your location to calculate the optimal setup based on temperature and air pressure.\u003c\/p\u003e\n\u003cp\u003eMounted on the carburetor is the engine air intake. Air is routed through a foam filter into the carburetor, ensuring clean airflow with the correct volume.\u003c\/p\u003e\n\u003cp\u003eThanks to the smart design of the airbox, the engine performs reliably even in heavy rain conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisplacement: 125cc\u003c\/li\u003e\n\u003cli\u003ePower Output: 23 hp at 8,500 rpm\u003c\/li\u003e\n\u003cli\u003eTorque: 19 Nm at 8,500 rpm\u003c\/li\u003e\n\u003cli\u003eWeight: 11.8 kg (Engine only) \/ 23 kg (Complete engine package)\u003c\/li\u003e\n\u003cli\u003eIgnition: Electronic ignition\u003c\/li\u003e\n\u003cli\u003eElectrical System: 12V 7Ah\u003c\/li\u003e\n\u003cli\u003eCooling: Water-cooled\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou receive everything needed to run and operate your Rotax engine. Included in the engine package:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete engine\u003c\/li\u003e\n\u003cli\u003eRadiator and cooling hoses\u003c\/li\u003e\n\u003cli\u003eExhaust pipe, silencer, and exhaust mounts\u003c\/li\u003e\n\u003cli\u003eFuel pump, carburetor, and fuel filter\u003c\/li\u003e\n\u003cli\u003eThrottle cable\u003c\/li\u003e\n\u003cli\u003eIntake silencer \/ airbox with mounting bracket\u003c\/li\u003e\n\u003cli\u003eComplete electrical system (spark plug, ignition coil, wiring harness, starter motor, battery, control panel, ignition sensor)\u003c\/li\u003e\n\u003cli\u003eFrame mount for battery and electrical system\u003c\/li\u003e\n\u003cli\u003eInstruction manual and engine logbook\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Radne","offers":[{"title":"Default Title","offer_id":54478614626627,"sku":"64016","price":2912.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0943\/9569\/5427\/files\/Rotax-Max-Junior-2025-2.jpg?v=1749044595","url":"https:\/\/www.radne.com\/products\/rotax-125-max-junior-evo-4","provider":"Radne","version":"1.0","type":"link"}