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If your OS 1.20 four-stroke flies the model well at 3/4 throttle, you'll be able to hover it with a G2300 at 3/4 throttle to full throttle.

One caveat - the G2300 will take some bench running in order to become reliable. If you can't do that, don't buy it.

The G2300 is one of the biggest *****cats to hand start that I have ever seen. I ran a 17x8 and an 18x8 on mine. I don't normally recommend hand starting, so I won't now. Use a chicken-stick. I used an OS Type-F glow plug in mine and something more substantial than a single cell Nicad for starting voltage. This engine does not pop and smack you back like other engines when propped properly.

It is not as "plug and play" as the OS 1.20 four-stroke, meaning that you will have to work with it a bit to get it where you want it (lots of break-in running time), but it is easy to run when compared to many other two-stroke glow engines that I have ran. It is considerably more powerful than your OS 1.20 four-stroke.

A Sullivan 12-volt starter's biggest limiter as to what size engine it will crank is the battery being used to power it. I used to start Quadra 35cc gas engines with mine, but I had to hook it up to an automotive sized battery in order to do it. This was back in the days before folks were using large packs of Nicads and gear reduction units to do the same job.