I have a prievious post regaurding this bike. The frame and the plastic is great. tires are good, just need a little mechanical advise. the motor struggles to throttle up in neutral, worse in gear. my main concern is that the valve train is very noisy. I am not familiar with the valve train on this bike. looking on line it shows the cam supported with two roller bearings. are they prone to fail. I am able to do anything mechanical but would like some history or feedback on this before i make the offer. Is the valve train noisy on these bikes, i only have experience on older suzuki's.