I got this info from the person that owns the LHS in this area. Our LHS here is advertising an MDS engine below cost with the purchase of any Kit or ARF, just to get rid of them. I have sold a number of my older OS 40s 46s to guys in our club that have had nothing but grief with the MDS engines I know that when you do luck out, and I'll repeat myself, luck out and get a good running MDS engine their fine and I will agree that some I said some will start just by flipping the spinner back against comp. the first time every time, and that's OK, but there are very few that will. I can safely say that Almost every and any OS will start with one flip almost every time or the ST or the FOX ,etc. What I'm saying is that the MDS line has a problem with quality control, Kinda like the Edsel of the RC comm.