Valves are within spec, low hours on OEM top end, stock mapping, engine ice, (coolant level never changes) fresh OEM clutch. No matter what oil I use, after as little as a 30 min ride, the oil is black and very thin. Its also a bitch to start when the motor is warm / hot. I've used the starting drill with a lil throttle and the choke pulled and it's on average 10-15 kicks! After it sits for a few minutes, then it's back to 1-3 kicks, tops. Heat strips are on order. Ideas?