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I use the J17Lm (lawn Mower) plug in all my small motors, Pal’s Scout, Ranger, Sea King Midget, 3/4 hp waterwitch, and any motor that requires a short plug because of the motor covers pressing against the spark plug boot. Look to the right side of the page across from the date and you’ll see an edit option for corrections. Your participation brings life into this
board and the conversations that take place here are intended to build interest in the hobby. Keep posting.Tubs, admittedly this confuses me. But, I know that champion recommends the J17LM for my two stroke Toro snowthrowers. In my feeble way of thinking, this plug was meant for four stroke lawnmowers. I would think it would have a cooler heat range than a two stroke plug because it doesn’t need to contend with burning off oil in the combustion process. But who knows, perhaps I am thinking about this all wrong…. Surely never had any fouling issues using the J17LM in my two stroke snow throwers though.
Well Don, you know that I find many of the early factory recommendations to be obsolete. When you consider the quality of the oil, and the recommended amounts in the 30’s and 40’s, I suspect a hotter plug would be desirable to reduce plug fouling. I wasn’t around then. I was beginning to run 2 cycle outboards starting in the late 50’s. Although I suspect that the oil had improved some by then it was still crap compared to the oil we have today. If I didn’t clean (dig out all the carbon deposits from the factory recommended plugs, using the factory recommended amount of oil -1/3 of a pint pre gal.) when I put the motor up, I would foul a plug the second or third time out the next year. Oil reconditions in the 30’s and 40’s were usually even higher. Today’s oil is so much better. I still have that 1/3 of a pint motor and still run it some every year, although I don’t run it as much as I use to. I haven’t even looked at the plugs in decades. This experience leads me to believe that a cooler plug may be desirable? Maybe – maybe not. There is so much to consider. I needed a short plug for several of my motors. So, same as my approach to how much oil I run, I tried them. Going by the date I saved the picture, these were in the 75 twist shift Martin my son-in-uses for fishing, and family boat rides, for 5 years at that time. It needed a short plug because the factory recommended substitute is too long. One plug was shorting out through the, brand new, spark plug boot. This motor is run on the 3 oz. per gallon of full synthetic that I run in most of my motors. I don’t know how valid my thoughts might be, but my experience indicate it is an acceptable plug for the motors I have tried it in.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
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