When mounting the eng. do you need too off the eng. or is built in?

I don't quite understand your question.

Are you referring to the down/up thrust? If so it's built in.

I`m sorry , what i was trying too ask do you need need too off set the eng. any degrees for eng. thrust.

Do you mean for Up/Down thrust?

If so, no. It's built in.

Since it's a pusher prop plane, there is also less of a "P Factor" effect for right thrust too, so get the engine lined up as straight as you can.

Thanks opjose
By the way would you know anything about the landing gear being weak? And what would be a good replacement set ?

IMHO they are not overly weak.

However they do not fair very well on hard landings and stiffer gear may do better UP TO A POINT...

( I would rather have the gear "give" then have the wing or fuselage damage. ).

I put in Robart 510W retracts in mine and these have fairly thick wire.

If you choose to go with the stock gear one simple solution is to solder a piece of re-inforcing wire as a cross brace... much like you would put in a tail support strut.