Im running the R70 on a super tiger 90 w/ pits muffler, so fasr it flies great but yes you do need to reinforce the landing gear. On the first madin Idid about 6 touch and go's and on the final landing after about 20' of role out the gear let go. other than that its a great plan.....good luck.. oh if you run the st90 make sure you plug one port on the exh.

Ken