This inner primary case permanent mold is cast from A356-T6 high grade aluminum for superior strength and CNC machined for exact fit. These high strength cases are thicker through the middle for added durability between the motor and transmission. These cases come with the main bearing and seal the starter shaft oil seal the starter shaft bushing and the chain adjuster installed. All Delkron FXR inner primaries come with the mid-shift hole drilled. The hole is plugged so it can be used on models with forward controls or simply knock the plug out for mid-shift applications. 1990 and earlier mainshafts have a 1.00" O.D. and must use the stock bearing P/N 9135 which can be obtained at your local dealer.
