ROTAX 600R E-TEC ENGINE: Following its big brother Rotax 850 E-TEC engine's lead with second generation E-TEC technology, the Rotax 600R E-TEC engine offers a 30% improvement in throttle response**, crisp acceleration and sets a 600cc class standard with 125 horsepower* while continuing to set the bar for reliability, and 2-stroke oil and fuel economy. *Observed HP metric based on internal dyno test in optimal conditions. **Based on internal engineering testing compared to 600H.O. E-TEC E-TEC SHOT STARTER: Push-button starting with almost no added weight. After an initial pull-start, the engine charges an ultracapacitor. Pushing the handlebar SHOT button for subsequent starts uses energy stored in the ultracapacitor to turn the magneto into an electric motor that rotates the flywheel, and with E-TEC technology, starts the engine. Eliminates nearly 20 lb. (9 kg) compared to conventional electric start. SHOT starting is only possible with Ski-Doo-exclusive E-TEC technology. REV GEN4 PLATFORM: Key to the Summit’s agility is the extreme mass centralization of the 4th generation REV platform. The trademark pyramidal frame, die-cast aluminum front suspension module and heat exchanger design ensure it’s strong, yet lightweight. COOL AIR FLOW: Side panel venting improves airflow to drive components for cooler operations and optimal performance. PDRIVE CLUTCH: A major factor in the quickness of REV sleds is the pDrive clutch. Fast and friction-free dual rollers transfer torque in place of traditional sliding buttons on this 100% clutch. The oversize rollers with needle bearings, wide flyweights and shaft-on-shaft design emphasize smooth operation and long life. Ultra-responsive shifting, impressive RPM consistency and 2.8 lb./ 1.3 kg lighter than the TRA VII. TMOTION REAR SUSPENSION: The tMotion flexes laterally, reducing the effort to initiate a roll, due to a ball joint at the center hinge between the rear arm and drop link and split flat-tube front arms. Very progressive motion ratio makes the ride on trails even more comfortable. MOUNTAIN ERGONOMICS: We designed the Summit to enable you to do more with less effort. The narrow body, beveled tunnel, tank, seat and handlebar controls are extremely compact and narrow for more room to move. And your legs will appreciate the flatter foot position.