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.
Your buddies on their new 103's and 110's kicking sand in your face? You don't have to spring for a new bike to keep up, just breathe some new life into your TC88! Our Muscle 95 top-end packages for 88" engines will reliably flat-out smoke a bigger factory engine - mile after mile, year after year.
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.
Your buddies on their 103's and M8's kicking sand in your face? You don't have to spring for a new bike to keep up, just breathe some new life into your TC88! Our Muscle 98 top-end packages for 88" engines will reliably flat-out smoke a bigger factory engine - mile after mile, year after year.
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.
Watch Your Riding Buddies in Your Rear View Mirror with the Zipper’s Muscle 103” Kit for Harley-Davidson® Twin Cam® 96” Engines!Everything you need for big power and performance gains packaged in a single part number… We’ve done all the engineering for you! The Zipper’s Muscle 103” Kit represents years of research and development. The result is an easy to install kit that produces outstanding results while maintaining Zipper’s legendary commitment to engine durability.
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.
Change your 88" Twin Cam® into a Zipper's Sport 107.
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.
Zipper’s Sport 107 kit for 2007-Up Big Twin bikes is designed to provide maximum torque and horsepower in the range where most of us ride - between 2,000 and 5,000 RPM. If you're the type of rider who rarely runs your engine to redline, this kit is for you. We've carefully matched our Stage II cylinder head design with our Red Shift 575 camshafts and optimized the compression ratio for super strong low and mid-range acceleration. With just a twist of the wrist, you'll have the power to pass without downshifting, even when your bike is loaded down for the long ride!
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.
Zipper’s has carefully developed this package with optimized compression, porting, camshaft design and inlet flow, combined with our best-in-class finish work, extensive dyno and ride testing to deliver a very balanced engine kit that will not disappoint!
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.
The Muscle 110 package is a dream to ride everywhere - short hops or on the long haul; torque and horsepower are increased across the entire RPM range. Where the stock 110 engine levels out at just over 4,200 RPM, the Muscle 110" kit kicks into overdrive and raises horsepower by 45%! Peak horsepower climbs from the mid-80's to the high-120's with torque over 100 ft/lbs from 2,500 through 6,500 RPM, breaking the 120 ft/lb barrier along the way. Power builds smoothly and effortlessly, without sacrificing low end torque, adding needed Muscle to the Bird!
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.
This is for CVO® owners who want to lead the pack! Our Muscle 110 Extreme kit is a combination of the right mix of components and modifications that extracts stunning horsepower and torque from the CVO 110 platform. Our goal was to break the 150 horsepower barrier on pump gas without creating a narrow power curve that detracts from the riding experience. The Muscle 110 Extreme delivers, with torque breaking 100 ft/lbs from 2,750 rpm through red line, peaking at 130 ft/lbs – turning your CVO® into a Rocket Ship! (See more information below)
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.
The Muscle 113 was developed as a more potent option to the popular Zipper's Muscle 110. Our Muscle 113 delivers up to 140hp and 60% more power over the stock CVO engine. Perfect for serious Sport Touring or Sportsman Competition applications.
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.
Zipper’s Muscle124” Kits from Zipper’s Performance Products have evolved from over 30 years of experience building large displacement engines, giving you pre-engineered performance kits with proven results. Designed to fit on the stock H-D® case, these Muscle engine kits provide you with incredible power, triple digit torque just off idle, and Zipper’s legendary durability. Zipper’s Muscle Kits are designed for use with high octane pump fuel.
Zipper’s Muscle 124” Kits include Zipper’s alloy 4-1/8” bore cylinders, precision-fitted with forged slipper pistons. Your heads are extensively modified with 2” intake and 1.630” exhaust valves, and then treated to full CNC porting and combustion chamber re-shaping for dramatic flow improvements using the latest machining technology. Hassle-free manual compression releases are installed for easy starting. Also Included in the kit are Pro-Taper chrome-moly pushrods, a full gasket kit, and a Darkhorse prepared S&S 4-5/8” stroke crankshaft. Zipper's recommends a 62/64mm HPI throttlebody for Throttle by Wire applications; for cable throttle applications, a 60mm HPI throttlebody.
We’ve done the hard work for you - every part is ready to install, and the end result is more of what our reputation is made from: Big Power all the way through the RPM range!
Cylinder heads are supplied on an exchange basis. Requires case boring for the big bore cylinders and Timken® conversion on the crankcase (not included in kit price).All kits can be purchased whole or in any combination of desired components, please contact our sales department at 410-579-2828 for more details and pricing.
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.
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.
BLK 99-06A MUSCLE 124 ENG KIT
*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
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.
Zipper's Muscle 124" Kit for 2007-2017 BETA Twin Cam®
BLK 07-17 TC-B MUS 124 ENG KIT
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.
