We always put 3 gallons of alcohol into engine first to put heat into it as it was supposed to be easier on it. Some of the Barrel valves were harder (more aggressive) than others as well. Though I dunno how that may apply to a saw. I thought an injector like a street bike oil injector directing the fuel above the crankcase may be a better route to go when heavy loads of nitro are used. Two advantages would be, the bottom end may getting more oil as Nitro kills oil, even 70wt nitro oil. And you can better direct the fuel in volume control and placement in the cylinder, like the down nozzles in a top fuel application.