Jackthack, an RC Ignitions converted G-62 will be very perfect of the plane you are putting it on. I have an RC G-62 on my 18lbs. Giant Aeromaster. This thing pull out of stalls , hovers with ease, then will fly stright to the stratosphere. I could not be happier. It is a great setup.
Since you already have the G62 just send it to Ralph and let him work his magic for $150.00. You can have it made with internal electronics in the cup on the back of the motor, or you just have him send it with the sererate electronic module You will get a lighter strong industral EI engine with life time warrenty on the electronics. The money you were going to spend on a DL50 $390.00(American distrbutor), you will need that money for electronics. It will help on those exspensive servos. The new lighter G-62 will make that yak 54 do things it aint sopposed to do I am really pleased with mine and you should be as well.

rcignitions.com
BTW I have a G-20, G-23, 2 G-38's, 2 G-62's all converted by Ralph Cunningham and I love them all. Just remember when he test runs them he is running them at 6000' above sea level.