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<DIV><FONT face=Arial size=2>Vicente</FONT></DIV>
<DIV><FONT face=Arial size=2>My experience in setting the idle on a two stroke
is to continue to lean until it wont run, then richen slightly. The motor will
then be instantly responsive to throttle. If you run with a rich idle you can
pinch the fuel line, at idle, and the engine will continue to run, even speed up
as it approaches the right
mixture.
Nat</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=vicenterc@comcast.net
href="mailto:vicenterc@comcast.net">vicenterc@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> ; <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 07, 2006 6:57
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Fuel
Regulation in 2C Engines</DIV>
<DIV><BR></DIV>
<DIV>All,</DIV>
<DIV> </DIV>
<DIV>It is evident that I had been setting the low end lean. Next time I
fly, I will adjust to get richer low end. I don't think I am running the
engine hot. However, I am going to try to improve cooling and see if
this helps. </DIV>
<DIV> </DIV>
<DIV>Thanks to all again. I got very good feedback. </DIV>
<DIV> </DIV>
<DIV>Vicente Bortone</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">--------------
Original message -------------- <BR>From: "John Pavlick" <<A
href="mailto:jpavlick@idseng.com">jpavlick@idseng.com</A>> <BR><BR>>
Jerry, <BR>> Thanks for confirming my observation re- lean idle = slow
transition to <BR>> idle. I first noticed this on my old Arctic Cat
sleds. I've always felt more <BR>> comfortable with 4-strokes - I guess
that comes from wrenching Harleys. I'm <BR>> finally figuring these
ringy-dingy 2-strokes out I guess. So who says toy <BR>> airplanes aren't
educational? <BR>> <BR>> John Pavlick <BR>> http://www.idseng.com
<BR>> <BR>> BTW - I've been using sealed bearings (seals on both sides
/ -2RS type) <BR>> front and rear. In stock configuration, normally the
front bearing is <BR>> shielded on one side only - no seals. This does
nothing (or at best very <BR>> little) to seal the crankcase. With both
sides sealed, there is much less <BR>> ch! ance of an air leak that would
definitely causes slow transition AND <BR>> erratic idle. In extreme
cases I've seen motors that wouldn't shut off even <BR>> with the
throttle fully closed. The fix was new bearings. <BR>> <BR>> <BR>>
<BR>> > -----Original Message----- <BR>> > From:
nsrca-discussion-bounces@lists.nsrca.org <BR>> >
[mailto:nsrca-discussion-bounces@lists.nsrca.org]On Behalf Of Jerry Budd
<BR>> > Sent: Tuesday, March 07, 2006 12:28 AM <BR>> > To: NSRCA
Mailing List <BR>> > Subject: Re: [NSRCA-discussion] Fuel Regulation
in 2C Engines <BR>> > <BR>> > <BR>> > >5. It is clear
that all 2-cycle engines will have this behavior. <BR>> > <BR>>
> I guess I have to offer a different opinion on this. If you have the
<BR>> > low end set lean (and most running the OS140Rx are running the
bottom <BR>> > lean to get the mid-range somewhat reasonable) you will
not be able <BR>> &g! t; to get the motor to settle into a low idle
quickly. And that <BR>&g t; > presents itself as poor down line
breaking, as well as the occasional <BR>> > flameout. When I ran the
OS140's I bought four motors and then <BR>> > picked the two with the
best carbs (aka midrange) so I could set the <BR>> > low end where it
belonged. I also used higher nitro fuel (Magnum #1) <BR>> > to help
lean the midrange, which also allowed me to run the pipe <BR>> > about
an inch longer (which helped soften the pipe "bump"). <BR>> > <BR>>
> I had good luck (post '02 Nats) and good power (8400 rpm, APC 17x12)
<BR>> > with the OS's, but I found that the throttle response wasn't
the best <BR>> > if you used a lot of throttle to control speed. When
I switched to <BR>> > the Webra 160 I was able to set the top end rich
and still have more <BR>> > power than I knew what to do with (because
of the enormous <BR>> > torque/very conservative exhaust timing), and
also set the idle <BR>> > sligh! tly rich so the motor would quickly
settle into a low stable <BR>> > idle. Of course this was a lot easier
to do with the MC carb since I <BR>> > didn't have to compromise on
the mixture settings. <BR>> > <BR>> > But, anyway, to bring this
back to point. The most prevalent reason <BR>> > for a 2c to have an
erratic idle with poor down line braking is a too <BR>> > lean idle
and a hot motor (like Evil Eric said). Adding a fuel pump <BR>> > or a
pressure regulator or whatever won't fix that. <BR>> > <BR>> >
Just my $0.02 worth, <BR>> > <BR>> > Jerry <BR>> > --
<BR>> > ___________ <BR>> > Jerry Budd <BR>> > Budd
Engineering <BR>> > (661) 722-5669 Voice/Fax <BR>> > (661)
435-0358 Cell Phone <BR>> > mailto:jerry@buddengineering.com <BR>>
> http://www.buddengineering.com <BR>> >
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