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Stock Replacement Pistons

for 61 cui Models 1915-1923

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
  • nominal bore: 3-5/16 ”
  • compression: 6:1
  • with rings, 0.625” wrist pins and snap rings
  • USA

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com