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spark plug grade and plug chops

PostPosted: Wed Aug 31, 2016 9:46 pm
by bluebob
couple of questions about the above.
for an example.say you do a plug chop using a cold type plug then note the plug colour.replace plug wiih a hotter grade plug and do exactly the same plug chop.would you expect any difference in colour?

probably a more important question,testing main jet range as example.Been running in ,nice and rich.plug jet black.go leaner for next run.to get best reading is it advisable to give the plug a quick clean,or is the effect of changing the jet so instantaneous that it doesn't matter.or do the experts carry a few clean and preset plugs with them.any thoughts please.

Re: spark plug grade and plug chops

PostPosted: Fri Sep 02, 2016 2:28 pm
by hullygully
don't clean the plug till after all your chops, you must do about 1/2 a mile @ constant speed to realistically change the colour :shock:

Re: spark plug grade and plug chops

PostPosted: Fri Sep 02, 2016 7:20 pm
by bluebob
cheers mate.
will take your advice on that.