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Mark..... ..don't know, I have Bosche W125T as cross-referenced to Champion H-12 which is cross-referenced to AutoLite AL-437. Heres the deal, sparkplug thread sizes are "internationally specified". That means no matter what country of origin, they fit. Now pay attention here. There are 3-sparkies specs that can screw into yer N's sparkie holes. Too too long 3/4" reach; too long 1/2" reach; and the just right 7/16" reach. (n.b. reach = length of screw thread, NOT including the protruding nose) Reach has NOTHING to do with heat-range. Champion H-10 are cool; H-8 are COLD; H-12's are warm. Autolite AL-437's are warm. Sparkie gap has NOTHING to do with heat range ...but... the wider the gap, the HOTTER the sparkie. (abilility to ignite the gas/air mixture) The abilitiy to jump the gap is called the ionization potential and is dependant upon the engine compression ratio and engine rpms. Problem with standard ignition coil sparkies, it takes TIME to build-up the required magnetic field that collapses when the points OPEN and induces the sparkie-volts outta the secondary. Just when you need hot-sparkies at high rpms, the coil ain't got enuff time to make'em sparkies sparkle. And so your engine starts missing and backfiring. This is generally NOT a problem with our low (2200) rpm tractor engine..... ...Dell, yer self-appointed sparkie meister
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