421 wampus refuses to start. bought it from a guy was not running apparently he had just built it. got it home clean the carbs put new plugs in and it started an ran good. pulled it apart powdered the frame put it together and it still started and ran good. left it alone for a week was going to ride it and it would not start. I have checked all grounds tested stator, coil, and swapped cdi with a none good one no luck. did a leak down passed that. has 150 psi on both cylinders. carbs have been cleaned and floats adjusted. noticed there was a grey milky liquid at the bottom of crank turned bike upside down got that out. I kick it over it try's to start and occasionally will half ass run for a second and dies. when the plugs are in the motor and I kick it they do come out a little wet but not bad. ive tried 4 sets of plugs. also have checked pick up coil distance that's good any thoughts