> Marc Friedman Wrote:
> -------------------------------------------------------
> That plug chart of Jay's is not the color of an insulator after two
> miles of riding..is it??? ..what about the color on the original post
> ...some is developing under the electrode....post a brand new plug next
> to any plug chop so it's possible to evaluate if it's white or even
> whiter ...
>
> Here's an idea: keep jetting up until it's gurgling. Go higher and it
> will four stroke to death. This is the cheetachrome method...if u keep
> changing things and nothing happens ...other problemo...
>
> Everybody says you gotta cut the threads off the plug to get at the
> base ..true..but really how many do that...it's quite a pain
>
> If you rode for two weeks and your plug was that white ...that's real
> bad. A two mile chop is a pretty subtle thing. Also where the part of
> plug most exposed to the exhaust port is at least on a Vespa is a bit
> different than elsewhere, ie leaner . But perhaps I'm wrong on all of
> this. What u say Dillon?
Honestly, I've never chopped up a spark plug to check the base of the electrode for coloring. At this point im pretty familiar with what the bikes I work on should run like, and how to correct said issues.
Like right now I can tell that after adjusting my derbis timing 2* advance, I need a bigger cutaway in the slide and to raise the needle, due to a cold temp lean bog at 1/8-1/4, and hot running conditions mid throttle.
I do agree Mark, vespas, specifically kitted bikes, will have a lean side on the exhaust side of the plug. I try to tune that out if the power can head a size or two richer