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Old 07-07-2005 | 07:53 AM
  #5  
bruce88123
 
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Default RE: Breaking in an OS LA 40
The OS manual recommends a 10x5 thru 11x6 prop. A 9 inch prop is just too small for an engine in this size range. A 10x4 would be OK for breakin but I wouldn't leave it on too long. IMHO

http://www.osengines.com/manuals/40-46-65la-manual.pdf
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