1974 135hp evinrude need help with ignition

[onehorse]

I posted a thread earlier today, but it was my first time so please look over the mistakes. I have got fire on all four cylinders when I have all of the spark plugs out of the motor. When I put the plugs back in the motor I have fire on all cylinders exept #2. I tested the coils and they all seem to be good. Any suggestions would be greatly appreciated. Thanks one horse

 

[rick_l]

Re: 1974 135hp evinrude need help with ignition

You could possibly have a weak coil. If you switch the coils with another see if it changes cylinders. That could tell you if you have a coil problem.

 

[ezeke]

Re: 1974 135hp evinrude need help with ignition

The 1973-1976 135HP engines demand 300 RPM to start. With no load on the engine you get spark because you can get 300 with the plugs out.

You need a powerful, fully charged battery and good clean battery cables to get that RPM with the plugs in.