Chopperman . I just bought a GMS .47 with front needle valve . Just finished running a 1/2 gallon of fuel thru it. On the stand , it runs very well after it`s broke in. It was one of the harder starting, tweaking engines ,I ve broke in . After break in , idle , transition and top end are great.
It should pull a trainer well. It is louder than my other .40 sized motors.
I also have 2 ST GS 40 that pull my LT-40 and a Tower trainer well. I liked them on trainers so much I bought 2 of them to train others with. $49,99 not a bad price.