Sounds like flooding to me. When you back off of the throttle quickly, the
engine gulps fuel and spits it out the exhaust. Try looking at the float
levels in the float bowls. Timing can play a part, but if it's running all
right otherwise, this is probably not the cause.
For SU carbs, the "bible" is the Haynes SU manual. Order from most lbc parts
houses (Moss, etc)
To: 'MG list server'
Subject: Stupid Tuning Question
Date: Friday, September 15, 1995 7:09AM
I have a 1972 mgb, I got it running pretty good, but it very litely back
fires when I shift, and if I let of the gas and coast in gear. I would
it is timing so I have been playing with that, but it also could be the SU
This leads to my second question, I am not familiar with MG timing
or SU carbs. Is there a good book or books you can recomond for these?