Lycoming's 72566 is a gear starter ring for the company's engines, specifically wide cylinder flange crankcase model engines. This starter ring has a 12/14 pitch that is used on Lycoming's crankshafts and camshafts.
Note: 149 Teeth.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
No problem installing this.
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It is just the ring gear, no pulley.
ID approx 11-3/8". OD approx 12-1/2".