Thanks for all of the info guy's. You all have been a big help. I will go with a APC 15x8 prop and try to lower the Nitro to 5% on my next gallon. I have 1/2 gallon of 10% I am workiong with right now. This engine does start very easy I most say. I also what to tell you all I am using a evolution glow plug in it that my be in the wrong heat range because it says it is good for both 2 and 4 stroke engines. What OS plug is the best for this engiine and I will pick up a few of them also.