From:John Faraci
Subject:RE: RE: RE: bad running when hot Date:Sun Oct 26 14:38:43 2014
Response to:5398
It's either ignition or fuel. Check that the gas cap is
vented. The Ace repro that I've seen was not vented. After 5
minutes of running the carb fuel bowl will run low causing
leaness. If its ignition, chances are it's the capacitor. A
defective condenser will work fine cold but will fail after
its hot and cause missing or not run at all. Maybe try a
different mag and see what happens. Good Luck and best

many thanks for the reply I did try that but no better, I
just advanced the
ignition timing past the original setting and it seems
better but when I go to
rev it a huge flat spot when hot yet perfect when cold.
Going down the pub
drown my sorrows.


just finished a major rebuild on 22 Ace start from cold runs
perfect and
smooth as it get hot say 5 minutes starts to misfire when
you open the
throttle it's flat won't pick up. The mag has been rebuilt
by a very well
respected company,has new HT leads, anyone else suffered the
problem ?

Do you take hot air from the exhaust manifold into the
bottom of the carb?
Modern petrol don't like it. Had that problem on my 1923 and
my friends
1921. We tok that away.