check the air in the 2 front tires .....ill bet the left one is lower on air
I think because unlike a car, there's just less between you and the wheel, so you might tend to feel it more, so much more in a car that absorbs it all.Yeah it is amazing how sensitive tires can be a lower pressures. On a car running a few psi off and you might never even notice it.
I am not sure what the pioneer runs at but my little Honda Recon is something like 4.5 psi. If had one at 4.7 and another at 4.2 it would make it feel all weird depending what tires.