Thanks for all the advice. It's really true that I have little experience with engine tuning and management. I got my UltraStick used and just brought it to the field and the guys there did all the needle valves and stuff for me.

Yet I wouldn't want to outgrow another 2-stroke 46 and get a 4-stroke after a short while. Is a YS 63 really too much for me to manage at this point??

Also kris, what do you mean when you say mounting the engine in a sidewinder position? I think currently I have my OS 46 mounted so that the glow plug is on the right side.