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Old 03-19-2010 | 10:15 AM
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SeamusG
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From: Arvada, CO
Default RE: Motor question
On weight differentials - the OS 91 FS weighs in at 24.2 oz and the OS 61 FX is 23.6. Also, both of these OS engines share the same mounting foot print - meaning that the OS 61 can use the existing OS 91 FS mounting holes. The OS 61 FX is a bit longer (4 mm)  than the FS - no biggie. Throttle control rod location may well need to be relocated.

Have fun with the conversion.
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