Johnson Model JW-10

[Dave Thomlinson]

I have an old Johnson 3hp, from early 1950s. This little outboard has not been run for 25 years. The problem is no spark. Could it be a dead coil? Any suggestions? (The motor is not seized and is otherwise in good condition).

 

[Paul Moir]

Re: Johnson Model JW-10

Certainly could be. If it's got no spark, it's got to be something under the flywheel anyway. All you have are points, condensors, coils and spark plug wires.<br />You need to use a flywheel puller. A harmonic balancer puller works well. I've got a beefy one I picked up at Princess Auto for the job. You'll also need three 1/4"-20tpi bolts 3" long. Do not use any sort of puller that works on the edge of the flywheel.<br />Nice 3hp tuneup article. <br /><br />If the coils are cracked and broken, that's your culprit. You can order new coils (18-5181 x 2), points and condensors (18-5006 x 1) from iboats fairly cheaply. Also, you might want to try with The Marine Doctor in Saskatoon. He can get the same parts.<br /><br />Tell us what you find.<br /><br />PS - you can get a service manual from the local library, Iboats, or an original factory manual from one of the following places:<br />TheOutboardWizard<br />Mastertech<br />Marine Engine<br />Ken Cook

 

[BillP]

Re: Johnson Model JW-10

I'd bet coils. You have two on that motor.

 

[Dave Thomlinson]

Re: Johnson Model JW-10

Thanks very much for all the info!