I know that everyone has their favorites and some people are quite adimate and vocal about their chosen engine. but I feel I must relate my experience here.

THE OS ENGINES that I have had ( .61SF, .61 FX, 46 FX and .91 FX) just simply are not worth the money. The .61 sf has an air bleed carb that I had to completely recalibrate and redrill the air bleed hole to get the thing to run.

The 46 fx was one of the predesessors to the AX. That one peeled the nickel liner and was trash.

The .91 fx was junk right out of the box. After an entire summer and 3 gallons of 15% - 18% fuel through it, is would not transition from midrange to full throttle. When I say, would not transition, I MEAN IT DIES and dead sticked EVERY TIME. It was boarderline lean at full throttle (Just rich enough to keep from going too lean and overheating) and also slightly rich at idle. When trying to transition from 1/2 throttle you could see alot of raw fuel backflowing out of the carb before it would actually cough and die. That engine was submitted to Hobby Services for repair or replacement. When returned, there was nothing done to the engine that I could see, nor was the situation corrected. A replacement engine was deemed out of the question since the engine was run and more than a gallon of fuel used.

Now, I, for the life of me, can not understand why I would want to spend nearly twice as much on OS, when there are Magnum's, ASP's, Super Tigers, and a whole list of engines out there that run very well, are warranty supported by the sellers, and dont cost as much, and dont require 3 gallons of gas trying to get them tuned.

Now wh