tex,
today was allot nicer day at the field the sun was out and the temp was around 20deg ...I changed to a APC 13x4w and it put it right on the recommended rpm of 11500 ...I haven't peeked the engine yet but here is a pic of the tac...I'll go back to the 14x4w as soon as the engine has used a couple of more tanks. Then I'll peek it ....JW