Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially and if no (major) mods, then:
Proposed further checks (if have not been done) on the possibility of over/under-voltage, regulator/rectifier and/or stator issue. With a volt/multi-meter, determine the battery voltage when:
Please post back results / observations of the above once tried.
Appreciate the information on "what has been tried"
Though the above was based on the contents of what were posted initially. Of particular concern was "...observing plunger from back of carb..." which lead me to suspect that the air box was not even installed.
Perhaps another member could provide a second opinion / alternate approach to your concern. The question would be re-opened as I would be opting out.
Please do not post back an immediate reply so as not to lock the question back to me.
Still, good luck with the Savage.