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This is a wild guess from me.
Because you heard a loud bang, and then a sound like a loud Harley, my thoughts are that one of the new sparkplugs blew out. It is quite possible that they new sparkplugs were not tightened down enough.
There are FOUR sparkplugs to your bike; two per cylinder. It seems to me that one, or two of them blew out of their hole.
Because you heard a loud bang, and then a sound like a loud Harley, my thoughts are that one of the new sparkplugs blew out. It is quite possible that they new sparkplugs were not tightened down enough.
There are FOUR sparkplugs to your bike; two per cylinder. It seems to me that one, or two of them blew out of their hole.