KTM 65 SX
So i bought a sx65 a while back for my daughter that had some engine issues. turned out to be locked up but i never figured out why. i replaced the crank and bearings along a new top end. now this thing will not start. I have good fire with the plug pulled, seems to have good compression. but i can hardly so much as a pop out of the the exhaust port with the pipe off. it has fuel, and the carb is clean. and suggestions ?