Hmm... whats important ....?

Low and Midrange power
Fast Spoolup
Torque
Consistent and Reliable as he!!.

I have had OS 25's that fit this bill....and my Norvel .074's are that way now that I know how to make them work...

I have had a couple TT.46's- great bargain, but not consistent one to the next. I have one that is the 'perfect' motor (as described above) and I would not trade it for anything, but I have a second one that just is not as reliable... I have tuned on it and refined the setup with this one (tank placement, lines, etc), but it will never be as good as my first....

Though I could not go to Cookeville because of our wedding anniversary this weekend, the wife got me a new OS 50 SX as my anniversary gift! I just love the look of this engine. The quality is amazing as always.... just like the first OS I got 20 yrs ago (and it still runs like a top) I may be cussing it in a couple of weekends, but if the success the other Mempho Probros have had with the 50 is an indicator, I think I have a great motor in my hands....