Hi all, My bike is 2005 Bulldog Just wondered if any of you guys can point me in right direction of why front Cylinder plug has black appearance on relatively low mileage engine using one carb. back cyl plug looks good colour. It runs and ticks over and pulls ok but obviously less than perfect tune!! Plugs both same, gaps are same. I have yet to do a compression test though on low miles engine I am not expecting an issue . I have been used to metric inline fours so big twins are a new thing for me!!! Any ideas appreciated?