gbopp wrote:
WD-40 is not penetrating oil.
Buy something like PB Blaster or make your own with Acetone and Automatic Transmission Fluid.
Only issue is I am spraying on the bottom of the bolt as it screws in from the bottom like an oil pan plug. Tried heat, WD40, tapping with a hammer and nothing except the square top of the plug looks like it may break off and then I'm really in trouble. Some of the thread are showing and I may be able to get vise grips on the threads but it will really tear it up. I removed the tail pipe next to it hoping I could spray some WD40 or rust penetrating fluid, but it go straight up into the muffler. So no way to put fluid on the threads inside the muffler. Not sure how much penetrating it will do from thee bottom. May just leave it alone and hope nothing ever happens because I never cleaned the spark arrestor. I'm sure may have never done it.
