Dude, you can get a .91 4-stroke ASP brand from Hobby King for $129.00 plus shipping, it's an ASP which is the same as a Magnum version. I have several they run great and last as long as the other brands..!!
ORIGINAL: luciuswillson
I guess if it's better to have a four stroke I could get a used .91. What would be the biggest 4stroke I could put in the 4*60 without it being to heavy or to powerful for the frame to handle the stress.