My hpi t-15 engine wont start i got a good glow plug, i charged the glow ignitor, the roto start is charged, and im not sure whats causing the problem i mean all i did to the engine was put a new exaust gasket in it, a gasket for the engine like wear the piston is underneath the head and i jus put a fuel filter im sure none of these is causing the problem i guess my engine is worn out or something i had it for 2 months and i been leaning it out sometimes