As well as synchronising the air flow (which you do first) you also need to
adjust the mixtures such that both carbs, when lifted independantly, cause a
momentary increase in rpm. If a vacuum leak causes an increase in idle it
sounds like you have a rich mixture.
PaulH.
-----Original Message-----
From: Lonn Howard <hoops@owt.com>
To: MGs <mgs@autox.team.net>
Date: 07 February 1999 19:14
Subject: carb probs?
>I've run into a problem that is new to me. I've set the carbs, SU
>AUD265s, to the datum settings and the engine runs with a rough idle.
>I've got good spark at all plug leads. When I pull the plug wires from
>one and/or two it barely makes a difference. If I pull even one plug
>wire from three or four, it dies quickly. Also, when I lift the back
>carb piston 1/8" it speeds up for a second, then dies. I can lift the
>front piston 1" without much effect. Both float bowls have fuel, and
>fuel is evident at both jets. If I introduce a vacuum leak to the
>manifold the idle jumps up like crazy. What gives?
>
>Lonn Howard
>'70 TR6 -mine
>'71 TR6 -in my garage
>'70 MGB GT -ours
>'89 Saab Turbo Convertible -hers
>
>"We are but temporary custodians with an obligation of preservation."
>
>
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