This linkage kit allows for super progressive or 1:1 throttle opening on a 4150 mechanical secondary carb that has the dual slot secondary lever.

Super Progressive - primary throttle shaft opens 60 Percent before engaging secondaries.

1:1 - primary and secondary move at the same rate and both open and the same time.

Includes required cotter pin for installation.

Details:

• Grade Type: Performance
• Material: Steel
• Color: Zinc
• Size: 30cc
• Warranty: Manufacturer's Limited 90 Day Warranty