75hp 1981 JOHNSON lost spark on bottom cylinder

[mypontoonboat]

I lost spark on the bottom cylinder of my 75hp Johnson. I swapped wires on the coil and got fire out the coil that was not working so I know coils are good. I installed a new power pack and still have no spark. Compression is 132 on all 3 cylinders. Is this the stator or timing base? How do I found out without having to buy both. Motor had cranked ran for a second cut off then I had no fire on bottom cylinder. The starter is turning over the motor plenty fast enough and I changing the power pack did not fixed it the problem. Please help! I looked over the wires going under the flywheel could not find any damage.

 

[Daviet]

Re: 75hp 1981 JOHNSON lost spark on bottom cylinder

Go to the CDI website and look up your engine, use their troubleshooting chart to help you find your problem.

 

[boobie]

Re: 75hp 1981 JOHNSON lost spark on bottom cylinder

The old rule of thumb on that motor was when you had no spark on one cylinder it was either a pack, coil or sensor.

 

[Bosunsmate]

Re: 75hp 1981 JOHNSON lost spark on bottom cylinder

Here it is
ISSUU - CDI Electronics Practical Outboard Ignition Troubleshooting by CDI Electronics
If you have a $10 multimeter do a resitance test on that timing base then the stator.
Also check none of them are shorting to ground