Mark.Napier(at)sciatl.com
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 Posted: Wed Apr 12, 2006 6:51 am Post subject: No Title |
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Hey Marco,
I went from 55 to 50 and down to 45 to get a reliable idle. Before that the
engine would load up and die if idled too long, say like when you're
landing. Turning out the air bypass screws only gets you so far. On the
ground I've loaded the plugs up so bad the engine wouldn't restart unless I
cleaned them. Now it will idle all the way down to 1800 on the ground or
~2400 in the air. Also I don't float down the runway on landing. I did
have to also change my needle jet from 272 to 274 to compensate on the lower
mid-range.
The iridium plugs seem to help as well. I very carefully gapped them to
0.018 (that fine wire is brittle). Ronny Smith claims the engine gets hard
to start if you don't gap them and I found that to be true after a few
hours.
About getting a lower idle, you might also have to file on the bottom of the
carb slides a bit. The slides are modified from the motorcycle versions by
adding in that rectangular window. It adds more air right over the idle
port. This adds fuel/air so the engine will idle with the added load of the
prop. Remove the prop load and you need to lower the slides more to lower
the idle.
BTW, have you seen a landing approach by an airplane equipped with a clutch?
When the clutch disengages the prop spools up to high RPM and the drag is
very high. You can land shorter but I don't like what that could mean in an
engine out situation.
FWIW,
Mark Napier
N246DR
KF III
Time: 10:16:20 AM PST US
From: "Algate" <algate(at)attglobal.net>
Subject: RE: Bing 54s - idle adjustment
With two strokes if you go lean on idle it tends to increase RPM rather than
decrease - maybe you're going the wrong way? - Bob Robertson should be able
to add to this
GaryA
Lite2/582
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