I find that the O.S. AX engines practically start on the first flip or touch with a starter, without needing any initial adjustements.

A tweak or two after they have had a tank or two run through them and you are ready to fly.

With the Tower, SuperTigres, GMS, etc. I have to spend more time breaking the engine in and getting things tuned up. Each engine has their quirks, so you also have to in part learn how to deal with them.

Is it worth the extra $120.00?

For a beginner, DEFINITELY.

For someone who is familiar with engine tuning? Things may be different.

I find that I now own a large number of engines. A quantity I would not have been able to afford if they were all exclusively O.S.

So I found myself first purchasing an OS engine for each size range and type, then switching to another manufacturer to obtain cheaper engines.

e.g. My first non-problematic 2C was an O.S. .46AX, afterwards I started using engines from other manufactures in that range.

My first 4C engines were O.S. 91 FS and an O.S. 1.20 FS Pumped, and after becoming familiar with those I switch to Magnums and Saitos ( I really like the Saitos btw, as they are VERY forgiving on the tuning. ).


If OS engines were not so relatively expensive, as are their parts, I would have stuck with them exclusively.

However I've also been pretty happy with engines from other manufacturers, excepting the Evolution 1.00NX.