Rolling...

I use 30% on mind, but I would recommend you stick with 20%. if that is not the case and you cannot replace the fuel, than you need to add shims to the head. I went with .5 mm worth of shims. Then, I went with a medium or colder plug. I use the ninja #7 plug. You also will have to retune the gine and be carefull with it. Don't go straight by temperature.