Bike is 2012 yz125. Did top end and don't think I torqued the left front cylinder bolt enough. About 6 hours later, Bike did some serious smoking and finally would not even start . Found some coolant leaking slightly from right below that bolt/stud and from underneath powervalve where cylinder meets case. Only lost small amount of coolant was lost, looked in radiator when cool and coolant is just even with top of fins so I would guesss 3-5 oz. So now I guess there is coolant in my case and cylinder. Another message board said to take top end off and rinse and drain the inside of the case with kerosene, and then rinse with some 2 stroke oil. Does this sound pretty accurate? Is it possible that my piston and ring are still ok? Also, is there anywhere else that the coolant may have gotten into, that I need to check out? Have not taken it apart yet, using spare bike for next few races. But already ordered top end parts just in case.