Moby - Stock exhuast blew apart

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.

Ideas/confirmations?

Re: Moby - Stock exhuast blew apart

probly compression possibly timing

Re: Moby - Stock exhuast blew apart

Timing is off, the jet is too small, the carb is too big for stock exhause as well as being too big for stock event timing.

Re: Moby - Stock exhuast blew apart

Yeah.

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