My son brought home a 89 basket case Blaster.  I overhauled the engine, piston, rings, seals, crankbearings, gaskets, etc.  We had the engine started one time and it sounded good.  I do not think the spark is hot enough?  I am not a two stroke mechanic by a long shot but do understand the principle. (Diesel is my preference) I have tried different spark module's, coils, etc. (used) this may be my problem?  Any help appreciated.