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Old 03-24-2003 | 04:20 AM
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visioneer_one
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From: St. Thomas, VIRGIN ISLANDS (USA)
Default YS 63 Muffler
Definitely vibration-related. These mufflers are also prone to the screws that hold the back end of the muffler on backing out. The engine is *incredibly* loud when this happens!

Performance Specialties used to offer a one-piece muffler for the small YS engines. I have one, and used it on my Top Cap / YS .53 combo with great success.

Another possibility - the muffler assembly from an OS .70 is thread-compatible with the small YS engines. These mufflers are very lightweight, hold on really nicely, sound better (IMHO) and are shinnier. I've been using one on my ME-109 / YS .53 combo with great success; I just installed one onto my DP Ultimate / YS .63. I haven't run this one yet, but I expect it to work just fine.
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