Well the ever tempremental Solex's have a nasty habbit of working their secondary venturies loose. best way to check is to take off the air filter and stick your finger in and wiggle them, if they are loose then they'll wiggle around, if not they'll feel solid (as they're ment to be.)
Other then that it might need a tune as twin carb setups can be affected by changes in heat and atmospheric conditions. Hell it could be as simple as knocking your dizzy and it having the wrong advance.
Hope you get it sorted, as the 2TG's are awesome
Jordan
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