RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better?
hey aero nut you said you increased your exhaust timing to 145 degrees from 125 . are you talking duration? did you cut the top of the port so it opens sooner ?where should it be from tdc?it really gave you 1200 rpm?! thats awsome!
i too am converting Ryobi hybrid twin ring four port on gas electronic ignition (got two now) only got mine at harbor freight, one looks just like SaCCal 72's, same carb etc. one runs on old stock two needle carb and 18x6 zinger prop 7500 rpm's . do you agree that the corect larger carb is the walboro wa167? what is the drawback of the single needle carb for rc use?