So - I just installed a 14:1 JE piston in my 2013 crf450. The piston *just* hits the plug at TDC, decreasing the gap to the point where the spark is too weak to fire. It looks like there are plugs with a low profile electrode... Does anyone have the part number? Where can I find one?? Doing a little bit of research it looks like NGK R7433-8 is the correct plug?