Petty, You can verify it at the link below. The 3.9 HP was only made for 5 years(1964-1968).<br /><br /> web page<br /><br />You can get parts here: It says 39/40 HP, but they mean 3.9/4.0 HP.<br /> Parts<br /><br />Another good site for parts:<br /><br /> Parts