Rm 250 engine coolant in bottom end help

I bought a 2005 rm 250 from a buddy he bought it bike looked mint before riding he checked cylinder through the exhaust port seen that it needed nikasil and new topend sent cylinder and head to tom Morgan he milled the head for race gas redid cylinder new topend got it back and broke it in and 1 hour later the crank came apart , he got a new oem bearing and crank with hot rods rod since Suzuki doesn’t have oem cranks in stock. Sent topend back to tom Morgan he went ahead and had tom Morgan port the cylinder , and redo the nikasil again and new top end , get it back all back together and it won’t start takes pipe off and there is coolant in pipe/bottom end. Long story made short he is over it I trade him a mint125 for it and now I have it, I sent topend back to tom Morgan to check for any leaks and he says it’s hokding good pressure and doesn’t know why it’s leaking. When I have the pipe off the bike doesn’t leak when piston is top dead center when I stroke it slowly down, it drips from the top right of cylinder when looking through exhaust port, and when it gets half way down where piston is half way between exhaust port it gushes coolant out but stops once it’s below exhaust port or above it . Any help would be appreciated this bike has it all but this is a headache. Thank you