Hello I am new to this hobby so your assistance would be greatly appreciated. Have new .15 Dynamite motor which is still being broken (now on 4th tank). Needle set very rich as per book (4 turns out), have run boat in water at no more than 25% throttle and using heat cycle method.
Problem I am having is that motor overheats after only 5 min of running and cuts out. Have to let cool down before restarting. When boat is moving can see great flow of water coming out of motor cooling head.
Did not have this overheating problem on previous tanks, seems funny that on 4th tank of break-in motor is now overheating, have not adjusted needle settings, have not changed fuel and there has been no change in air/water temps.
Could problem be that engine needs to be leaned out for performance as stated in book, but I guess that would not be logical as less fuel would mean hotter motor...right!!

By the way motor is being run in a Miss Elam hydro...

ciao