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Thread: OS 61 four stroke
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Old 12-07-2015 | 01:56 PM
  #8  
hsukaria
 
Joined: Feb 2007
Posts: 3,216
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From: Dearborn, MI
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Those numbers do sound good for a 61 on 12x8. The ASP/Magnum 52 I have barely can turn a 12x6. I had to switch to a 12x4 for reasonable performance, on 20% nitro. The OS 70 can turn a 13x6 with no trouble. Also, I would make sure that the valve gaps are within specs, just in case.
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