Here's another tip if you've never run an OS LA series motor before. For a significant power boost, remove the baffle from the muffler. To do this, unscrew the bolt that runs front to back through the muffler. The baffle is the cone shaped device inside. Take it out and reassemble.

It will make it a little louder (not much), but the power increase is tremendous. I was at the field a few weeks ago and someone was making a maiden with a .25 LA that would barely get the plane off the ground. I suggested removing the baffle. For comparison purposes, he tached it before and after. He gained 1200 RPM!

-Scott