well guys, yesterday was extremely fruitful! with the 2 ounces of 10% nitromethane in the 1/2 gallon of gas/oil premix i gained a whole 500 rpm's! then i pulled the crimp off of one side of the muffler and pried it open and pulled out the baffle to the tune of 300 rpm gain so i am now sitting at 7000 rpm's wtih a 15x10.. i thought i was going to have to deal with this engine being weak so i went ahead and ordered some props for it about three days ago, and since i thought it would continue to be weak i ordered 16x6's! so if the engine is at 7000rpm with a 15x10 what is it going to do with a 16x6 add into that the fact that the 15x10 was a k-series prop by MA and the 16x6 i ordered is an apc.. i don't think i will be able to use the 16x6's they are going to allow the engine to over rev probably.. does anyone know what the max rev is on a stihl 30cc? or i guess i could go by any 30cc trimmer engine's max rev.