"twin motors on a high wing trainer " i'd just buy the ARF
and those poor LA series motors are fine for the bucks but seal the backplate and needle valve and carb and head.... well all motors should be checked for air leaks it just saves on agrivation later. we had a guy in our club bring a la 45 in for a motor repair demo we did with a cracked case full length of the lug the other lug half off and misalaneous (sp?) other chips and breakage but with some well placed JB weld And some shaping before it got all the way hard it runs like a top!