Gas/Glow Fuel conversion consist in using a mixture of 10%Nitro 10% oil glow fuel mix in a 1 to 2 ratio with 91 octane gasoline (1 part of this glow fuel with 2 parts petrol) take note that this is a 10% oil content glow fuel blended for R/C nitro CARS this way you'll end up with a mixture of 3.33% Nitro, 3.33% oil, 26.33% Methanol and 67% Gasoline (aprox). If you can't get 10/10 glow fuel you can try the 20% nitro plane glow fuel blend and cut it to a 10% Nitro by mixing 1 part of the 20% glow fuel with 1 part methanol, you should end with almost the same formulation as the prior mixture but with 0.33% less oil (to me thats even better) this will end up giving you a 33:1 oil ratio in your fuel which is standard for the weedy engines I personally like 40-50:1 ratios.
As far as engine modification, these consist in adapting a 4 stroke glow plug via a glow plug adapter that you can purchase through Horizon Hobbies, you can use your walbro carb but need to lift a little bit just above the carburators body the regulator needle underneath the diaphragm, this is to let pass more fuel through every pulse, it doesn't damages your diaphragm gaskets or components.
The advantages of this system are as follows.
1. Save engine weight by removing the coil and flywheel (aprox 1 lb).
2. Gain power, about 500-800 rpms (this varies with the condition of the engine).
3. Better Idle and throtle transition from idle to full power.
4. Mantain the fuel economy of gasoline.
These are some of the advantages that I think are reason enough to convert.
So I hope this clarifies your doubts and questions about this system that we have perfectioned through our experimentation period and belive me once you try it you'll liket it so much that you,ll become a "GAS/GLOW CONVERT " for ever.