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Update: Found the potential source of the sparks. The catalyst is mostly gone. There's a hole ripped right through the center of it. When I bought the bike the catalyst was fine. So, either that burned on its own (unlikely) or bits of hot metal took it out (more likely).
I'm going to do a compression test this weekend, and also rent an inspection probe and see if i can spot damage. My bets are that I lunched a valve.
Charles.
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