ok I.ve just started a new project its a 1972 aerocraft with a 1972 johnson 125. The guy I got it from said it had a spark problem. But it has a new ignition box so I was curious. I sprayed some starting fluid in the air box and it fired. So I hooked up a new gas tank(stock onboard tank is shot) the lower carb started leaking. No big deal thats easy I said to myself. So I unhooked the fuel and tried the start fluid again and now it seems to only fire as i let off the ignition switch. I was going to take the control box apart anyway because the neutral bypass for warm up isnt working. Should i just replace the key switch while I'm in there????