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Fitting Pistons

  1. Check piston-to-bore clearance. Standard size pistons are color coded Red, Blue or Yellow on the piston dome. See ENGINE SPECIFICATIONS table at end of article.
  2. If bore diameter is in lower one-third of specifications, use a Red coded piston. If bore diameter is in middle one-third of specifications, use a Blue coded piston.
  3. If bore diameter is in upper one-third of specifications, use Yellow coded piston. The Yellow coded piston is .004" (.10 mm) oversize.
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