Nitro boats have a differnt fuel, they take more nitro% and the oil should be around 16%. Yea one of my setscrews on the coupler came off easy and the other one wont even budge! Do you think i should pick up a set of allen wrenches and some waterproof grease? Also when you let off the gas should the prop instantly stop or should it spin for a while then stop? Mine stops right after i let off the gas![:@] Well i gotta go catch my flight now. See you guys later