i have a 96 trailblazer 250 , brand new topend from ritter cycle has spark has fuel has compression, so it should run right?!..wrong... well all i get is the occasional backfire it will not start at all, the crank seals are good, im running oil injector, also running premix 93 octane and klotz 2 stroke oil. also the timing is dead on
i have checked everything over and over again and all is showing good spark is strong,
what can it be that im missing please help