Could be a stator problem or CDI if you have no spark. Last year I bought a used VIP the motor turned over-had spark but no compression. I purchased a BBK and when I went to install it I found the crank was broke. I hope this is not your problem.
To check stator unplug the 2 wire connector--set VOM to 200 VAC place black on ground and touch the red lead to the (RED--RED//WHITE OR RED/BLACK) wire it should be above 40 VAC and less than 80 VAC. when hitting the start button with motor turning over.
Other problems I have encountered is VALVES not set correctly and oil seals on valves leaking and rings on piston bad
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