It aint rocket science
Join Date: Nov 2010
Location: Glastonbury, Connecticut, USA
Model: The best
An ignition or internal engine problem not likely IMO. Verify air jet controller hoses are connected correctly (bottom port of both carbs connected to same common hose and likewise with top port hoses and that they go to the correct AJC, one is for the idle circuit the other main circuit.
Observe carb slide action by looking into carbs while it is acting up, they should always be moving in tandem with a tell-tale spray of fuel where the needle enters the carb body.
There is NO substitute for experience
I'll be around when I come around and not before
Internet myth buster
WS Grand Chapter CT
If local and need help with a 1500, Valkyrie or ST repair please PM