I am not verifying that the H10J is or isn’t, the right plug for a Pal. But the “H” has to do with thread length; and the H is longer by a tad, than the “J”. The J plug may not reach as far into the combustion chamber as it should. Also, “10” is hotter that “7”, so you may get some plug fouling. There seem to be some H10Js online for sale. Why wouldn’t you just get the right plug? Disclaimer: I do have a Pal but have never gotten around to playing with it, yet; so these are armchair observations.
Long live American manufacturing!
