Changing spark plugs on my 2011 VF250 I noticed #4 had this rubber grommet attached to the top of the plug. When I removed the coil it was on the plug. It was the only cylinder to have such a thing. Seemed to prevent the coil from making good contact as the rest did not have this. Is this suppose to be there or should I leave it off.
all comments welcome!! Thanks for the input.