Working on a buddy's stock Moby, need to pedal fast and a lot to get it to fire up. On one attempt it went "kapow" and the back end of the stock pipe blew off. Smoke is dark, damp, and electrical smelling.
Points; 16mm SHA; 68 jet; bike rev's up great on the stand but will not hold an idle.
I'm pretty sure I know what's up, but I won't mention it just yet, so as not to influence responses in any direction.