First of all, are the engines Rossi (Axel) or Novarossi?
Second, check the inside of the block and see if the venturi cuts match up with the cuts on the other sleve. If they don't, you will burn up a expensive motor rather quickly!
Herolin <---Traded my Airtronics for an Ipad and Laptop...
Soon to be GHETTOPRINCIPAL..