noncritical 5 #1 Posted June 13, 2024 20 hp onan anyone could tell me the shaft size for motor swap Share this post Link to post Share on other sites
Achto 29,383 #2 Posted June 14, 2024 I believe it is a 1" shaft. Share this post Link to post Share on other sites
76c12091520h 3,895 #3 Posted June 14, 2024 A 20hp Onan has a 1 1/8" crankshaft Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,451 #4 Posted June 14, 2024 Don't know the length but 1-1/8" diameter is the most common. You can also use 1" diameter as the 8hp and some of the early 10hp models used the same pto but with a different inner race to fit the crank. Share this post Link to post Share on other sites
