Rysium. I'm running my magnum 1.8 (30 CC) with 8-10% oil and 4F plug on a small ventury walbro (I think it's a 9mm venturi) it runs beatifull although AV8TOR recommended that I would problably get more out of that engine if I used a bigger carb (11mm venturi), well I opened the back cover of the engine after running it and I see plenty of residual oil so I don't worry about my bushing seising out, the engine will still throw a smoke while running so that means that I do have enough lubrication and the plug doesn't get fouled up at all. So go for it buddy convert your O.S. BG, I thought that I was going to trash mine because of the expensive glow fuel, but now I don't have to worry of doing so thanks to our Gas/Glow conversion.