Rusty:
That is a GREAT name for someone into old British cars!!!
Perhaps that is a nickname assigned to you because of your hobby? That
or "Lucas" are the consummate names for LBC aficionados.
The gas leak occurs because the needle valve is not sealing, so
the fuel pump is over filling the float bowl. The fuel then leaks out
through the float bowl vent. Your carbs do not have a vent port valve,
so this port is always open to air through the air cleaner. This
references the float bowl pressure to the atmosphere pressure present at
the inlet of the carb, resulting in more accurate fuel metering.
Possible causes of the fuel leak are: Dirty or damaged needle
valve or seat, leaky float or float height set incorrectly. To remedy
the issue requires disassembling the carb and the appropriate parts.
Despite the experiences of others on the list, I have had great success
with the less expensive Grose needle valves from Moss should you decide
to replace the valves.
Cheers,
Vance
-----Original Message-----
From: owner-6pack@Autox.Team.Net [mailto:owner-6pack@Autox.Team.Net] On
Behalf Of Rusty Greer
Sent: January 21, 2007 5:38 PM
To: 6pack@autox.team.net; triumphs@autox.team.net; Alan Cooper; John
Flory
Subject: carb question
i am trying to rebuild a TR250. there are some pictures here:
http://www.greer.org/picasa/2006/TR250/index.html
it had been sitting for 10+ years. we have tried to clean things up
as much as we can to get things running again. today was the big day
that we decided to try to crank it up for the first time. when we
tried, gas came out of the carb through a hole that goes into the air
cleaner (see attached picture). any ideas on what may have caused
this? we took the carbs apart and cleaned them up (obviously we did
something wrong)
the picture can also be seen here:
http://www.greer.org/picasa/2006/TR250/target48.html
any help would be greatly appreciated.
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