Reply to thread

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Message: <blockquote data-quote="C5Performance" data-source="post: 135492" data-attributes="member: 2938">With a rich engine or weak ignition a wasted spark setup can cause a few issues. It is more pronounced on engines such as Harley, Virago, or Moto Guzzi with a V configuration. I have never noticed an issue with inline Japanese cycles...they all run wasted spark (1-4 and 2-3). Also with multiple sparking there isn't enough unburned fuel left in the cylinder to cause ignition at the "wrong time" during exhaust stroke. My thought as I read this thread was perhaps a leaking intake runner (Steve83 actually mentioned that earlier in this conversation). Swapping carbs would not solve the issue if the intake was a problem. It could also be a sticky valve. My Peugeot car had the same issue after a rebuild and it ended up being the valve guide was on the tight side. Once we put on miles the issue slowly went away. I have seen motorcycles do the same thing (tight valve guide) Unfortunately all the really smart guys have already tossed out some wonderful suggestions. If the bike runs better with our C5 then I also would guess the bike is running rich, only because that is one area multi spark makes a dramatic improvement with. I will consult my local Wing guy and see what Louis has to say about this.</blockquote>