I have been experimenting with running it on E85 with a glow plug so I figured why not try spark ignition with gasoline. I already had the CH ignition module and spark coil and making the sensor adaptor was easy. I put a small 1/8" magnet in the prop drive adapter and set the timing at 28 deg. I left the carb set just like it had last run on E85 and when I hit it with the starter she fired right up. It was just a little too rich on both top end and idle so after setting the needles I took her up to full throttle and held it for about 1 minute. Looking at the temp on the thermal probe I was surprised at how cool it was running. It was at 265 which is about 25 or 30 deg. hotter than on 10% glow fuel. I was also surprised at how long it runs on 6 oz of gas/oil. I am running the gas/oil ratio at 20:1 and I am planning on checking the rod and crank for distress later tonight. It has two tanks through it now and that should be enough to give some idea on how the crank and rod will hold up. The plug was tan on the insulator so the mixture and plug heat range are close. Not that I have much choice on plug heat ranges with the Rimfire but at least it is close. If the 40 holds up well I am going to put all my parts on a ST51 and run it on my SuperSportster in place of the 40. Cheap fuel at 3 dollars a gallon and it runs twice as long as 10% glow fuel. The 51 will make up for the power loss from going to gasoline and it should be a very good combo.