I've done quite a bit of welding with damn near the whole bike together. No probs with coil etc. One thing is I'm a bit goofy about gas lines, tank, etc. in the way. One stray spark and BOOM! End of swingarm is pretty far away from all that but be cautious. It's pretty thick steel, in order to have a nice penitrating weld you need to get it hot. Hot equals mad sparks.