I am 5'6" 135lbs athletic build and I am wondering if a Yamaha TTR125 is too small for me. I have never ridden a dirt bike and I can pick one up for $500. I don't plan on racing just trail riding in the summer and I plan to purchase a new bike in a year or two. Would this be an okay bike to start with for $500 and using every now and then. Also can you buy bigger coils or a lift kit for the bike?