Topic: CB350F spark plugs: NGK D8EA vs. Denso X24ES-U - don't like Denso!

[HondaMan]

Advancer unit on CB750 must be set in its counterclockwise position of its play before tighten it. F, T and full advance will then match case mark.

If other end position of its play, ignition will be too advanced when matching up with case mark. I have seen this on 2 different cranks.

This happens often after the crankshaft was turned CCW direction with the big nut by the points, with sparkplugs installed. It makes the hole in the end of the crank (which locates the spark advancer peg) oval, and loose. I also have seen cases where the pin on the advancer is smaller than the hole in the crank (!), so then I take a thin, small piece of brass sheet and wrap it around the pin before sliding it back onto the crankshaft. This removes the slop, and often puts the "T" mark on dead-top-center afterward.

[dave500]

even stock that pin hole to locate the advance unit is sloppy by a few degrees either way,bosch plugs are colder for sure at the same heat range,just use ngk its the only way.