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03-25-2007 | 08:11 PM

#37

Gringo Flyer

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From: Formosa, ARGENTINA

RE: ST 90 help

Bruce, those numbers are on a ST90 with stock muffler and a Jett muffler. So the 120 Jett muffler is good for about a 500 rpm boost on a 14X6 prop.

Bob, if you find out the bolt pattern is the same on the OS 120 would you let me know?

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