Looking for some help please. Purchased a 1975 Johnson 115 hp outboard motor (model #115ESL75E) and boat. Previous owner had it sitting for 3+ years with gas in it. I have overhauled both carbs and thought I was ready to go. Come to find out, what I thought was good spark is only good spark in the #1 sparkplug; 2, 3 & 4 have no spark. Replaced spark plugs, wires look ok and grounds look good. I tested the kill switch. Switch is open in ?normal ? running position? and connects or closes a circuit in the ?tripped or fallout? position. I am pretty good with mechanical and OK with electrical things (i.e., I know how to use a volt and ohm meter) I have the manual but don?t have a neon tester (I don?t even know what that is) and at this point am kind of at a loss as to what to do next other than take it to a marine shop ? any help would be greatly appreciated.