Oh yeah, they are tight when you first get them. Just about squeak through top dead center, but loosen up once you run them. I ran mine on a test stand for about 45 minutes (starts and stops and cool downs), but once they have been run in, they run great. I have two GP-42s, both are great and I wouldn't hesitate to buy another. I still think it would be a good motor for the LT-25, certainly experiment with different props (lower pitch larger diameter). I don't think it would be over powering it at all. The LT-25 is a pretty good size plane, a good source for power is a good idea. A TT GP-42 is an economical solution. I've got one on a Kadet Senior, and learned how to fly with that combo, but now wish I had more on it. The second one I used on an Avistar that I flew the heck out of until I decided it wasn't worth fixing anymore. And it flew great with it. Personally I think it would make a great sport flying plane. But I do admit I've have a lot of success with the GP-42. Happy researching. Tom