Ok, after researching the engines you guys mentioned.... It's between these.

TT pro .46 $80.00 1.43 bhp 482g
Super Tiger G51 $80.00 1.48 bhp 522g
GMS .47 $70.00 1.47 bhp 475g

Do these brands compare to my OS46FX? Would they do good on a 40 size Super Sportster? Or should I put the O.S. in my sportster? And anyone have experience with a these engines? In comparison on ease of break in, starting, preformance, and reliability.