Primary chain adjuster assembly.

• Active plate and back support plate investment cast with 4130 Steel
• Chain shoe machined from Nylon 66
• Increases torque by 3.42 ft/lbs
• Reduces primary noise
• Help prevent damage to primary
• Improves motor bottom end and inner primary race bearing durability
• Made in the USA
• Prevents damage to your motorcycles left side motor case bearings, inner primary bearings, clutch hub bearings and transmission output gear bearings