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Thread: Muffler sizing for OS 91 two stroke
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Old 10-16-2006 | 11:48 AM
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w8ye
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From: Shelby, OH
Default RE: Muffler sizing for OS 91 two stroke
The problem is that a muffler for the 91 requires more internal volume than the muffler for a 61.

Check your internal volume?

With a lack of volume, the engine will detonate and get hot.
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