been working on an old nitro boat. i acquired a losi mach 427 engine for the boat. anyway long story short, i got the engine bolted in and adapted everything to work. the engine i acquired is brand new never ran. i set the screws to factory settings and went to start the engine for the first time. I'm running vp 20% nitro. I've got a belt starter to start it and primed the engien pretty well. engine fired right up. i let it idle for 10-15 sec and revved it slightly then shut it down. let it completely cool, then started it one more time. i did notice that there was no smoke coming out of the exhaust. anyway a day later, spinning the engine over by hand, when the piston gets to tdc, its binds up and doesn't want to turn, i did pull the head and there appears to be minimal scratching on the cylinder walls but nothing that would cause it to bind up and basically stick at tdc. i havent taken the engine completely apart at this time. anyone have any ideas whats going on here based on what info I've given? i realize theres not a lot here to go off of. thanks