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Where did it break.? I wouldn't run it (for long) if it was open from the cylinder head, but a missing muffler would be ok for a short time. With a straight pipe, I wouldn't be sure about damage, but it would be loud.
I had an over rich problem that ultimately clogged my stock muffler (catalyst). It gave me running issues after tuning the carb. I pulled the muffler and it ran great. I ended up getting a performance muffler.
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