A pair of os25's would be a better choice of engine for this plane, but those 40's are probably going to cause more harm than good. I can take off from grass at 2/3 throttle and cruise at 1/3. The OS25fx's are a ball bearing engine and great quallity and reliable. Not one engine out and aproaching a dozen flights on my 160. And I can fly for a solid 15 min and still have 1/4 to 1/3 fuel left. I am using 9-5 wood props and hand flipping to start. Easy starting engines.

Tuning each engine for best performance is a key to getting this plane reliable. I tuned each of my OS25fx's so I had a reliable idle, without added glow power, and a smooth transition from idle to full throttle. Then I checked and double checked that my throttle linkages were working together as close as I could make them. I set my lowest throttle trim to just close the carb, so I can kill the engines, and made sure that both were fully open at full throttle. Took awhile but it was worth it. My engines seem to be really close throughout the entire throttle range. The more time you spend getting the engines right, the more you will enjoy this plane. I can take off and just ease on the rudder to stay lined up.

Good luck with it and have fun. It is a great flyer if treated well.

See ya,
Rod