Roketa 150cc won't start  By  slothmonxtr (Read 1,170 times)

I recently purchased a Roketa 150cc Sicily from a friend of mine.  I purchased the bike knowing that it won't start.  My friend stated that 2 years ago he was riding the bike, and noticed that he would periodically lose power at full throttle.  However, it would immediately return to full throttle.  The bike then became difficult to start.  However, several days later the bike stopped starting.

I have pulled the fuel pump off, and flushed the tank to remove all old fuel.  Refilled with 91 octane fuel.  Pull carb, and confirmed the bulb on the carb was full of fuel.  Took carb apart, and cleaned carb.  Replaced fuel lines, and vacuum lines. Pulled fuel line off fuel pump and found pump pushing fuel while engine cranking.  Replaced spark plug, and confirmed plug has spark by grounding plug.  Found pressure in valve by placing finger on spark plug hole, and popped finger off as engine cranked.

I am out of ideas.  PLEASE HELP!!!