It has a Roto 35 already installed. Here is a link to the sales ad. http://www.rcgroups.com/forums/showthread.php?t=2258050 I couldn't pass on it, I had a new in box ARF that I sold a few years ago and regretted it shortly there after. I was very happy to find one in great shape and close enough to drive to pick it up. I was also lucky that it has a brand new cowl still in the box as a spare.