Eugene Zimmerman
Joined: 10 Jan 2006
Posts: 392
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 Posted: Sun Oct 15, 2006 5:19 pm Post subject: Spark Plug Readings |
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John,
I have always found that you won't go wrong by starting with new
plugs and stock jets and pin clip in a center position. Fly for an
hour or two listening for a slight stumble while descending under low
power. This stumble indicates a sufficiently rich mixture. Check the
plug color after the engine has cooled down. In many cases the plugs
will show a dark grey to slightly black oily color. Lean out by
raising pin clip to top position and cruise for another hour or two
and check plug color again. Should be slightly more brown and show
less oily residue. If it is still gray or black and oily, a jet
change to a smaller size may be called for or a worn needle jet and
needle replaced. At the altitudes and temperatures I fly the stock
jets and needles usually provide enough mixture adjustment to get a
nice brown plug color. I have found that the color inside the exhaust
pipe also eventually reflects the plug color. If the plugs look
light tan and dry the mixture is TOO lean. A two stroke will also
"talk" to a mechanic's trained ear which is what I most depend on but
that skill is not easily taught to a newbie.
On Oct 15, 2006, at 5:09 PM, John Hauck wrote:
| Quote: |
| restore the stock jets and go strictly by your plug color to
| determine any further adjustments if necessary.
|
| Gene
Gene:
Before the days of readily available and less expensive
EGT/Pyrometers, We always used plug readings to dial in two and four
strokes.
What procedure do you use in dialing in a two stroke using spark plug
readings?
Take care,
john h
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