[TR] TR250 Stromberg plug

[tomislav.marincic at earthlink.net (Tomislav Marincic)]

If the carbs are original to the TR250, the forward carb is tapped on top for 
the vacuum advance. The rear carb has a threaded hole up top in the same place, 
but the hole should never have been drilled all the way through to the venturi 
for the vacuum signal. Are you sure you are getting a leak there?

Cheers, Tom