Zipper’s Sport 107” Kit for ’99-’06 Twin Cam® 88” engines greatly improves the all-around power output of the 88” Twin Cam® engine. The Sport 107 is a great choice for the rider looking to give new life to a tired or failed engine. Over 100 ft/lbs of torque is available from 2,400 to 5,200 RPM, while Horsepower is a linear line to 110+. A new 4-3/8” stroke crankshaft replaces your factory 4” stroke crank. Your cylinders are decked and sized for 3.937” forged pistons, while your heads are modified with Zipper’s high velocity Stage II CNC porting. Our Red Shift 575 cams and Dual-Piston Tensioners ensure valve train stability; Pro-Taper pushrods with EZ-Adjust covers are included with top quality gaskets. This kit delivers excellent results with the factory throttle body and injectors, keeping costs down.

Highly recommended option: Zipper’s # 417-495 blueprinted cam chest upgrade with our patented Red Shift Dual Piston hydraulic cam chain tensioners, blueprinted billet plate, HV oil pump, cam bearings and quality USA lifters for improved reliability and durability. Exciting New Life for the 88” Engine!

This kit uses your factory head & cylinder cores sent in for modification. An exchange may be possible once your cores are cleaned, inspected and qualified for exchange.



Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

*To ensure you enjoy a premium experience, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website.
Click here for Zipper’s Build Sheet/Job Order Sheet

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