https://www.ebay.com/itm/16421653252...cAAOSwXspeyUqr
Comes in an envelope, decent price tag.
Did you insert the sleeve backwards? Show a photos of the exhaust port. I've bought improperly assembled engines in the past, it's pretty common.
Best to take photos as you take something apart to get it back together again right, if all the above fails. Not firing at all, not even spitting, that's what I'd check to rule out next.