ORIGINAL: ameyam
I am not familiar with Megatech so I cant help in regards to the engine. But if you were able to start it before you moved the LSN, you should be able to start it again.
Second, remove the glow plug and eject the excess fuel that you flooded the cylinder in trying to start it. That is what is causing the tightness at the TDC. This is best done with an electric started, watch out for the spray of fuel.
Hope I helped and best of luck
Ameyam
I do not recommend using an electric starter to remove excess fuel. This can cause damage to the crankshaft and/or connecting rod. Removal of excess fuel should be done by gently turning the engine over by hand. Actually, "rocking" the engine from TDC to BDC with the exhaust port pointed down is best.