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Bill---This didn't go thru the first time!
(Thanks, Mike)
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From: tr6taylor@webtv.net (Sally or Dick Taylor)
Date: Fri, 12 May 2000 20:24:50 -0700 (PDT)
To: bill.georgas@mciworld.com (bill.georgas)
Cc: 6pack@autox.team.net
Subject: Re: '72 TR6 Running Lean
Message-ID: <25347-391CCB02-2283@storefull-284.iap.bryant.webtv.net>
In-Reply-To: "bill.georgas" <bill.georgas@mciworld.com>'s message of Fri, 12
May 2000 09:43:51 -0500
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Bill---OK, the first list of items to be checked for lean-out you say
weren't the cause. I have more, but some will turn into long shots.
Still, if you're not the original owner of this '72, anything could have
happened, so here goes.
In the carb pistons are tapered needles that regulate fuel flow as the
throttle is opened and the pistons rise. These are determined at the
factory to give a satisfactory mix of fuel at all rpms. These needles
should be marked "B1AF" and should be in the proper position up in the
bore. If this is not the stamping on the needle, or if it's been set too
low, the mixture might be too lean at idle and thruout the rpm band.
Air entering the intake manifold from unregulated source(s) will also
lean out the mix. Some owners use a propane bottle, slightly opened at
the torch end, to search for an intake leak. (RPM will rise if it sucks
in the propane gas.)
There's an acceptable allowance when setting the float levels, between
.625 and .750. If you find nothing above to contribute to your leaning
out, or inability to lift the piston even 1/16" without he engine
stalling, try the floats at the higher setting of .625. (This brings the
fuel up the jet closer to the bridge.)
It's gotta' be a forehead smacker, when you finally find the cause!
Dick Taylor
'73
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