All tests with a Mejzlik 18-6...What I meant to say was a conversion makes no performance difference over a stock mag using gasoline....
A G26 with a conversion runs the same using gas, picks up 600 when running glow fuel ..You need a WT499 carb to do this....But if you run glow fuel you don't need the weight of the ignition system and battery...
G26 stock or converted using gas, 9000 rpm..I just converted 9 of these, all ran the same...I used a Dale Abell muffler, the stock muffler runs about 8200....
G26 glow, 9600 rpm, glow plug or ignition conversion, didn't try it with the stock mag...
G26 with a Mac's Products tuned pipe, 10,000 rpm gas, didn't try it with glow fuel, maybe later..
G23 stock, gas, 7200 rpm
G23 glow, 8000 rpm..
Most G38s run a 20-8 or 18-10, a G26 won't work very well with one of those.

A prop with an 8 pitch will not reach anywhere near the rpm of a 6 pitch on these engines..
I haven't tried other Zenoah engines using glow fuel.....Imagine running glow fuel in a G62 at $15 for a gallon....
A G62 HDA 48 carb is about $65 retail..A WT76 should work the same, cost about $42.00..The HDA 48 has the pulse hole offset in the base, so a WT76 would need to have the pulse hole relocated or if it's on one of my conversions a fitting in the back cover to connect the pulse hose would work....