I know there had been some discussion about modifying the ASP .12 for speed. Well, it seems the .25 ASP is the engine of choice for speed limit combat. Just got a couple today. They work great. I ordered the ones with the remote needle, and mounted it to the mount lugs, parallel to the thrust line. Keeps it nice and flat in case of an inverted landing. The thing started first flip, and restarted perfectly. The needle handles bladder pressure fine. Just a little fuel tube added to prevent leaks around the needle. Will be running 9-4 or 9-5 props. Seems to be a direct copy of the .25 FX OS engine.