Reversing Wires for Outboard Spark Plugs
MW stated that the 15 hp and 20 hp have basically the same setup regarding plugs. So I looked inside one new model. It was hooked up exactly as I had done. Took a photo of the setup, just in case of another lapse in memory.
Now all I need is 'ice out', some great spring weather, and a chance at getting on the water. Thanks again.
Mr. B - The more I think about it the more I believe that If you have the plugs reversed your spark will be 180 degrees off, meaning when your at TDC with one cylinder the spark will be present at the other piston which will be at the bottom of the cylinder. It'll likely do nothing more than backfire, but that certainly shouldn't cause any damage.
The plug wires get used to being in a certain position for a long time, and you should be able to see which way they want to naturally lay.
You noted it was difficult to connect the shorter plug wire to the furthest cyclinder - that is likely your answer that it is bass ackwards...
Also, off the cuff, if you had the wires reversed you should be 180 degrees off, meaning that all it should do is back fire, or run like absolute crap.
Put the wires where you think they belong, and if the motor starts easily and runs smooth, there is nothing left to check. If the motor backfires, you have them reversed.
For a short run period, I truly can't imagine there being any damage.