Motorcycle Questions? Ask a Mechanic.
Hi, is it oil or fuel fouling the plugs? Is it smoking and if so what color smoke?
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, is the idle high? ...sure of the "...carb redone..."? ...carbs mounted correctly with no possible leak?
Still, let's try a few test and review of the basics; first check the battery voltage:
Check the battery voltages as above posted.
If have not been tried; inspect the battery, its ground lines and/or check/clean the battery cables + terminals, connectors and wiring as a preliminary consideration. Have the battery externally charged and then LOAD TESTed (even if new/charged and just for the purpose of eliminating it as a suspect).
Check for presence and consistency of spark when attempting to start.
And it would be necessary to have a compression check or perhaps better yet, a leak down test.