Reading plugs from an unleaded engine is a great deal more difficult than it
used
to be when we had leaded fuels. Color ranges aren't there.
Mike & Kerry Gigante wrote:
> yeah, but this is an art to do really well.
>
> It is easy to do the plug cut, but hard to accurately
> read the colour and match that to mixture requirements.
>
> Tis more of an art than a science... Took me quite a while to
> get it right back when I was racing production 2 stroke
> motorbikes. You wanted it lean for HP, but not *too* lean
> because you'd seize the motor. I got good at catching the
> seize with the clutch long before I was accurate enough on
> the plug reads!!!
>
> Far easier, more accurate and *quantitative* to go to a
> rolling road dyno where they know SUs or Webers or
> whatever your preference.
>
> Mike
>
> ----- Original Message -----
> From: <Daniel1312@aol.com>
> To: <NewNGsInfo@cs.com>
> Cc: <spridgets@autox.team.net>
> Sent: Sunday, March 04, 2001 5:14 AM
> Subject: Re: SU Carb. needle info and CHARTS!
>
> > Hi John,
> >
> > I'm not surprised because it is a typo. CUTS should be CUTS.
> >
> > To accurately read the colour of the deposits on a spark plug you need to
> > know what they look like for any given rpm. EG run the motor up to 5K, hold
> > steady, then switch off the engine and dip the clutch. Then have a look at
> > the plugs, the deposits on them are the ones from running the engine at 5K
> > rather than after you decelerated went down through the gears, idled the
> > motor and stopped.
> >
> > Daniel
> >
> > In a message dated 03/03/01 08:24:16 Pacific Standard Time,
>NewNGsInfo@cs.com
> > writes:
> >
> > << I don't understand that phrase/operation. Help?
> >
> > Thnx, John >>
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