2017 KTM 450 EXC-F Six Days, If maximum power is required, there is no other way but the 450 XC-F. The compact SOHC (single overhead camshaft) engine that delivers explosive but controllable power shares 95% of the parts with the bike of Ryan Dungey winning the AMA Supercross championship 2015. DESIGN 1-cylinder, 4-stroke engine DISPLACEMENT 449.3 cm³ BORE 95 mm STROKE 63.4 mm STARTER Kick and electric starter TRANSMISSION 6-speed PRIMARY DRIVE 31:76 SECONDARY GEAR RATIO 13:48 CLUTCH Wet, DDS multi-disc clutch, Brembo hydraulics EMS Keihin EMS Come to Central Florida PowerSports, your favorite New and Used KTM Motorcycle Dealer in the Orlando and Kissimmee, Florida area.