Rotax Engine – Max Jr. If you're interested in a Rotax Max engine for your son or daughter's kart chassis, then the Rotax Max Jr. kart engine is for you! More powerful than the Mini Max, the Rotax Max Jr. is a great engine for individuals aged 12-16 years, and it can be de-restricted as your child progresses through the sport, making it not only a great learning tool, but an economically sound one as well. With 20 horsepower, the Max Jr. is a perfect balance between the Mini Max and the adult Rotax Max engine line consisting of the Max Sr. and the DD2-125, providing plenty of grunt for blistering on-track performance. Needless to say, we think you'll be impressed with the versatility and usability of your Rotax Max engine! To order this engine or for further assistance, contact K1 Race Gear today – we would be happy to help! The Rotax Max Challenge Series The Rotax Max Challenge series – sometimes referred to simply as RMAX – is a nationwide motorsport program that allows individuals to advance through the ranks through a hierarchal feeder system, and it utilizes the Rotax Max engine (all derivatives) for all 6 classes. Whether your son or daughter wants to race for the thrill of it or to advance through the sport in the hopes of developing a career, the RMAX series is a great way to learn the skills necessary for competitive motorsport. And the great thing about the series is that all that is needed is a Rotax Max engine, kart chassis, and $75 individual RMAX membership. If your son or daughter is planning on competing in the Rotax Max Challenge series, we carry that karting equipment and children's products that you need. Features of the Rotax Max Jr. Engine · 2-stroke · 1 cylinder · 15 kW / 20.4 HP · 124.8 ccm · Liquid cooled · Centrifugal clutch · Chain driveKARTS AND MOTOR SALES  ARE NOT ELIGIBLE FOR FREE SHIPPING