Just picked up a Coleman BT200X, been hitting the trails while waiting for the upgrades to start rolling in. I'm really impressed with this bike and plan to build it to handle just about any hill/terrain that comes in it's path. First I'll be installing a torque converter and engine riser plate. I plan on using a 7" driven clutch, a 9 tooth front sprocket and a 60 tooth or 72 tooth rear sprocket along with 20x7x8 knobby tires. I'm going for maximum trail machine, 25-30 MPH is my target speed running mostly stock parts. I'll post the progress I make and the hurdles I endure on the build so others who want to do a similar build might find something useful.