I find many pieces-parts need the be replace, I have no blast-explosion, only not to standard parts, some part destroy complete. I contact seller of engine set, I contact engine set seller in Kansas, Chase USof A he say he send part not mechanic, he send parts all parts alingment is assured engine runs as promisad, we very enjoyment. BTW I call 2nd cell numnber for Mr Jittendra Whose, he say he not send factory menhanic either, very very busy call back next week.