Thanks Pro4nut, yes I am aware of that CDI unit and am pretty sure I am going to test it. Really nice that they also now supply spark plugs with the same thread as a glow plug, that's been a big issue in the past with most engine builders making their own.
The other issue with petrol is that you need so little per power stroke that nitro engine carbs need to be closed up a great deal to avoid running rich, which makes the needle setting very sensitive. But it seems most people manage to run them successfully. I am planning a fuel injected system for my engine which should avoid this problem and give other benefits, in the future.
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