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Message: <blockquote data-quote="madguru100" data-source="post: 194833" data-attributes="member: 3381"><p>Hey guys so i bought a used bike recently apparently it had a top end rebuild rode fine but every time i go riding it loses power or turns off / missfires and everytime i check the spark plug it seems to be fouled . It's got stock jetting everything stock except for a pro circuit silencer . The spark plugs seems to always look : Liquidy black or dry black . Its got an exhaust leak near the header i bought the gasket i'm awaiting for it to be received could this affect the richness? I run 33:1 with shell oil do i need to change the jetting ? If yes could anyone help me through it i'd greatly appreciate any help guys the bike has been driving me crazy . Spark plug that i use is a B8HS</p></blockquote><p></p>