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Forged piston by Competition Distributing

Item №
59-993

Higher compression forged pistons to fit most all Harleys from 1915 to 1929, singles and twins, as well as many other early motorcycles. They are sold as pairs including rings, wrist pin, and snap rings. The selection includes oversizes of +.015”, +.025”, +.035”, +.045” and +.055”. All rings come + .005” over piston size. Sometimes fitting is required. Recommended piston clearance is + .005” to + .008”. Wrist pin size is .625” (61”/1000cc) or .791” (74”/1200cc). Compression ratio is approx. 6:1 (stock is 4.5:1) but pistons can be machined down to lower compression if you desire.

Later 1924→ 61” piston with 0.791” piston pins are not available.

  • fits 61 cui Models 1915-1923
  • aluminum
  • Ø 84.8 mm
  • Over-/Undersize: +0.030 ”
  • nominal bore: 3-5/16 ”
  • compression: 6:1
  • with rings, 0.625” wrist pins and snap rings
  • USA
  • gross weight: 1.35 kg

Later 1924→ 61” piston with 0.791” piston pins are not available.

net price*
$672.56
* United States of America: Tax free shipping. Please check your local import fees.
In stock. Ready for immediate delivery from our Würzburg, Germany warehouse
pair
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