WHAT’S NEW ON THE 2014 YAMAHA YZ450F? The best part of the 2014 YZ450F’s redesign is that Yamaha listened to the complaints of local YZ450F racers. Remember the ultra-wide radiator wings? The 2014 wings are 14mm narrower. Remember how DR.D made lowering kits for the YZ450F radiators? The 2014 radiators are lower. Remember how hard it was to get into the airbox? The 2014 airbox does not require the rider to remove the radiator wings, seat and gas tank anymore. Remember how obnoxiously loud the airbox was when riding the YZ450F? The 2014 YZ450F is twice as quiet. Remember the engine relocation kit that every National rider put on his YZ450F to move the engine forward? The 2014 engine is 10mm closer to the front wheel. Whatever your issue was with the previous bike, Yamaha’s engineers tried to do something about it for 2014.
IS THE ENGINE THE SAME AS IN 2013? No. Every part of the engine has been moved, changed, recast or
redesigned. Here is the list: Intake cam. The intake cam has 0.20mm less lift and a more gradual lobe that opens the valves sooner than in 2013. Intake valves. The diameter of the intake valves has been increased from 36mm to 37mm, and the valves have new intake port shapes to go with the size increase. Exhaust valves. The diameter of the exhaust valves has gone from 30mm to 30.5mm, and the valves have new intake port shapes to go with the size increase. Rev limiter. The upper rev limit has been increased by 250 rpm. Piston. The compression ratio stays the same at 12.5:1, but the 2014 piston is a flat-top piston instead of domed. Additionally, the piston has a friction-reducing coating on the skirt sides. Wet sump. Gone is the oil tank in the front of the YZ450F engine. The 2014 engine has been changed to a wet-sump design with an oil mister aimed under the piston. Water pump. The water pump employs a plastic resin impeller to save weight.