Got the bike a few weeks ago and it ran. I replaced some carb parts, changed the trany fluid and cleaned and checked the piston and cylinder. I get a great spark when i take the plug out and ground it to the cylinder head while i petal. If i cover the spark plug hole with my finger while the spark plug is grounded to the cylinderhead nothing happens...no spark no turn over. If i take my finger completely off the hole then it turns over and i get sparks. and if i just barely cover the hole and i get sparks and the engine turns over awesome. Any ideas?