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Old 11-28-2007 | 06:55 AM
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speedster 1919
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From: Martinsville, IN
Default RE: SPA engine options
The older YS60 and YS61 2 stroke are all legal most of the 4 strokes are not. The YS63 4 stroke would be legal but you would be up against OS91's in a 60 size plane. If you got a 40-45 size plane the YS 63 would be fine.
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