2014 Yamaha YZ450F

2014 Yamaha YZ45OF is a modern bikes.The significant of 2014 Yamaha YZ450F internal changes are plenty. Working from the top to the bottom, the air box has grown in capacity by 265 percent increasing power in all RPM but especially the top-end. The sucking noise from the airbox area is much quieter than the 2013. We noticed we could pull a bit longer in second and third gear before having to up-shift. Both intake and exhaust ports have different shapes from last year and the valve sizes have increased from 36 to 37mm on the intake and 30 to 30.5mm on the exhaust. The piston changed to a flattop style and acquired a friction-reducing surface treatment. Yamaha wanted to provide easier to use smooth power and while the ’14 is less jerky off idle it is still pretty jumpy. We changed the mapping, adding some feel and taking out some ignition timing from zero to quarter throttle. We also went up to a 50-tooth rear sprocket, which let us use third gear the entire track. Overall we were able to make the YZ450F a little more user friendly.
                                                                     

          In the transmission, the shift forks have changed shape along with new floating shift bars, larger diameter shift shaft and beefier shift lever all aimed at smoother, quicker shifting. When compared to last years model, clicking through the gears is slightly easier and the shift lever doesn’t have to move as far to engage the next gear. Inside the tranny, third is shorter than the ’13 YZ450F’s creating a shorter gap between second and third gears.