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I never knew this was a thing! Makes sense though. Motorbike has two spark plugs per cylinder, when it's running with just one it's a bit shit, backfires, parps, stinks of fuel etc, not completely combusting, and thats on an engine that breaths ok, doesn't have any inheritant flaws. Not sure I can make both sparks face the right way though, will see!
BrickMan
Doesn't that usually mean a spark plug/fueling issue?
Stoopid question but have you indexed the spark plugs? http://www.enginelabs.com/news/getting-the-most-out-of-your-ignition-spark-plug-indexing-101/