I am trying to figure out the problem that is been confusing me. I have had my carbs cleaned and was still having an issue so I pulled the wire off of the right rear plug and put in another and placed it to the block to check for a spark. I noticed a small spark when I turn bike over than stopped until I reached 4500rpm then recieved a big spark. repeated the same test to theleft rear and noticed no spark at all. Would this be a wire or coil issue? I have a 1985 Venture royale 1200 cc