Anyone have any knowledge of the different sounds the bigbear 350 4x4 [1999] makes and what to look for.when idleing and I put it ni 1st or reverse and give it a little throttle it sounds like a lout harsh knocking from the right side of the motor. this is my first bike so I am new to them,but I am very capable with wrencges. Does anyone have any past experence like this or know anything about it.