Take a look at my thread on the SuperTigre 51 I converted to run on gasoline and oil. I do not use a special carb and it still has bushings in the rod. The carb is a bit sensitive but still usable. I run it on gasoline/oil mix at 16:1. I have had no problems so far with about 2 or 3 hrs of run time. I did run it with the spark ignition on regular glow fuel at first just to see what effect the spark ign. would have. It ran great and idled much better than glow.

Good luck with your experiment.