went to a local track for my first run with my 1.7 kb with 10 lb pulley.......1.83 60 ft., 109.9 mph, 12.39 1/4 mile time, smoke started pouring out the exhaust near the end of the run, motor shut down. started motor and I hear a knock, probly, piston rod, time for forged bottom and 14 lb's...