Keep Nitro 10% or lower for best operation. We use an O.S. #8 or the O.S. Type F glowplug. We recommend you try both to see what works best for you.
Dave this portion came right off the Super Tigre site. I have a NIB Magnum 4 stroke that says the engine was specificly designed to run on 5-10% nitro but can be run up to 15% Dave your into motorcycles so you know there are minimun and maximun recomendations. If you run in the middle your usally safe but when you run on the edges there are consenquences to be had....