In a message dated 99-11-11 20:54:56 EST, jdonovan@mediaone.net writes:
<< It starts when cold, but even if
the choke is out it runs as if at low idle. After running for a little
while it quits abruptly. Will restart, but only for an instant before
quitting again. >>
Joe,
Although I'm more familiar with SU carbs, the choking arrangement for the
Zeniths may be similar.....It sounds to me like your choke linkage isn't set
correctly to increase engine speed with the choke engaged. On the SUs, there
are metal cams or followers at each carb that turn against an adjustment
screw which raises engine speed (fast idle screws) in relation to how far the
choke is pulled out. Engine speed needs to be increased with the choke
engaged because the mixture is too rich to support combustion at idle speed.
The engine probably chugs to a stop but will restart only to quit again.
Have you tried using some accelerator pressure to raise the idle to around
1500 rpm while the choke is engaged? If this works, check your carb choke
linkage with engine off - if you have a "fast idle" cam or follower or your
Zeniths, see if it's operating per spec. It helps also to depress the
accelerator when starting from cold while setting the choke - pulls the
throttle linkage away from the choke linkage so you get an easier pull from
the choke cable!
Good luck,
Chip Krout
'76 TR6 CF57822U (Being Reborn For Y2K)
'70 Spit Mk3 FDU78512L
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