LOL David,

We could call it "Miracle"

Don`t you think if that could be done YS would have done it already
We cannot rule out that it will take more effort for a gas 4 stroke to compete with a Glow version of even close to the same displacement.
This means .more stress lighter weight ,working on the ragged edge.
This is where reliablilty breaks down ,when you demand the absolute most out of anything it`s going to have reliablity issues. Getting a gas four stroke to even come close to what a YS 175 can do ,Dreaming! unless of course YS does it its not just about how much prop can you turn it`s way beyond that it`s about having the ability to use the power,brakes, midrange ,make noise, keep vibration down, available exhaust systems , airframes, props, ECT and the ability for the motor to do exactly what you want when you want it to.
evey time you fly no matter what the conditions are.

I`m not sure where the Myth came from that YS Engines are hard to mantain! I generaly get 500 flight without any issues when set up correctly,and have for many Many years , Learning how to run it so you can get 500 flights well that takes the effort.
the problem is we blame the Engine instead of our own lazyness sometimes I dare say the guys complaining about mantaining rarley see 500 flights in 3 years.

The Pure raw power of a YS is no Accident, it was developed to give the most power to weight of any engine in it`s class and has for many years.(in it`s class) Nothing can touch it, nor probably ever will. When it comes to power and reliability, and the utmost in controling, usable powerband a gas comparison is just dreaming.

Not to say there is not room for Gas engines in pattern I think Matt has blazed the trail ,But the Standard is the 175. Turn a 20-10.5 in 95 deg weather and 100% humidity at 7500 rpm and then get a reliable pur idle at 1350 and you will see what I`m talking about.

However just when Gas is close, YS just adds displacement

Just trying to bring some reality in the conversation.
Bryan