Timing question

Hi all I am having a bit of an issue I installed the E advancer and when the engine is idleing it stumbles intermitently. Also when trying to kick start it it back fires. and then on other times it starts fine but ialways get a little stumble on idle and when pulling away in first I get a pop or missfire a stumble then the engine picks up ..
I attempted a speed run and the bike started to missfire and then died on full throttle .
I have strippred the carbs and checked float levels and everthing carbs are clean jetting is as it was prior to fitting Advancer.
To be honest I am scratching my head with this,. I am thinking idle circuit I have checked for air leaks spark plugs look good Timing good .could it be the advancer ..... as i said im a little lost ...
All the best Funky
 
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