My friend has a 115hp johnson that takes a lot of cranking to get started and then it wont idle slow, after it warms up you can give it throttle and it will get the boat moving but it seems very gutless. We put an electric fuel pump on to be sure of enough gas. It has a weak spark but I dont understand the ignition system. It has no tach, 120 psi compression, new plugs, starter and battery seem fine, this motor has a jet foot instead of a prop. I suspect spark problems but I dont know how to test it out. Some ideas on this would would be greatly appreciated.
Willy
Willy