Spark Plug "sign of trouble ahead" ?
Posted March 31, 2003 - 03:57 AM
Posted March 31, 2003 - 04:17 AM
I just did a top end job on my 99 WR. I found the same type of findings as yourself. I purchased my bike used last spring. I would like you to Make sure it is oil. What I think I found is that my bike was setup very rich (180 MJ) with the wrong Accel Pump settings. This caused excess gasoline in the cylinder to start disolving the carbon on the cylinder head and top of the piston. I think this is the black oily substance that you might be seeing. If I had to make a reccomendation to you I would tell you to remove the head, valves, and cylinder (to check your rings) clean all parts with solvent. Replace your valve stem seals. Between the Valve seals and checking your rings you would eliminate a possible oil problem if you had one. Then assemble. In the end research and spend time in making sure your jetting is correct otherwise you will do all the work for nothing. Good luck.
Posted March 31, 2003 - 05:09 AM
Posted March 31, 2003 - 11:29 AM