Big Twin®

Pinion Bearings

$0.00

Engine Rebuild Parts Quality bearings, bushings, races and other parts for engine rebuild and upgrades. Proven parts that will provide years of faithful service.

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Pro-Street 5/16″ Spring Kits For EV & Twin Cam® Engines

$0.00

These spring kits are designed to give proper pressure when used with cams in the .550" - .675” lift range.

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Pro-Wire 700+ Valve Spring Kits For EV & Twin Cam® Engines

$0.00

To make big power, you run an aggressive cam profile with high lift.To maintain control of the valve train, the valve spring needs to provide adequate seat and nose pressure, and be able to last a reasonable life cycle in a sometimes brutal environment. In today’s performance engines, this is one of the most highly stressed components; for this reason, you should only consider the highest quality spring you can buy.

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Rear Wheel Chain Sprockets

$0.00

American-Made rear wheel sprockets for 1973-up wheels. Choose from light weight 7075-T6 aircraft quality hardened aluminum alloy or high quality carbon steel. Manufactured in full width for size 530 chain, for maximum strength. Available in dished (.245" offset) or flat for standard Harley® 3.250" bolt circle 5-bolt pattern. 1994-2002 tube-frame Buell 5-bolt pattern available in flat only. Note: if replacing a sprocket provided in a Zipper's chain conversion kit, measure the center hole size of your existing sprocket and order the same center hole replacement. *** Due to supply problems, only aluminum rear sprockets or chrome steel rear sprockets are available!!! ***

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Red Shift® 576V2 Evolution® Big Twin Cam

Red Shift Cams® 576V2 Evolution® Big Twin Cam

Red Shift Cams®

$0.00

576V2: This cam is designed for high output 80-88” EV engines, 10.5:1 and up. Aggressive torque and horsepower; with good heads will produce 105+ hp. Minor case clearancing necessary due to the larger base circle used to reduce pressure angle. Hydraulic travel limiters suggested.

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 is here to help, if you have a question(s) please scroll down and fill out the form and hit send. We will review your question(s) and we will be in contact.

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Red Shift Cams® 626V2 Cams

Red Shift Cams®

$0.00

626V2: Torque cam for big bore/stroker engines, shifts optimum power to lower RPM range (2,200-5,500). Excellent choice for larger displacement engines in heavier bikes that will be operated at moderate RPM’s. Case clearancing and hydraulic limiters required.

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 is here to help, if you have a question(s) please scroll down and fill out the form and hit send. We will review your question(s) and we will be in contact.

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Red Shift Cams® 647V2 Evolution Big Twin Cam

Red Shift Cams®

$0.00

647V2: Big motor horsepower cam. New dynamics matched for today’s cylinder head technology yields excellent power increase throughout rpm range. Works best with 10.2 + compression on 100”+ cubic inch engines. Case clearance and hydraulic limiters required.

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 is here to help, if you have a question(s) please scroll down and fill out the form and hit send. We will review your question(s) and we will be in contact.

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#413-442 Red Shift Cams® 656V2 Cams

Red Shift Cams®

$279.95

656V2: This cam is designed for maximum torque, yet produces excellent top end power in 96”-125” street engines. Ideal for use in heavier machines; a real stump puller! Requires moderate compression. Uncomplicated head set-up; moderate TDC lifts make installation of this cam easy. Works best with 9.8-10+:1 compression. Case clearance required.

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 is here to help, if you have a question(s) please scroll down and fill out the form and hit send. We will review your question(s) and we will be in contact.

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Red Shift Cams® 715V2 Cams

Red Shift Cams®

$0.00

715V2: Big power cam for large performance engines - The HP King! Big lift and broader timing, designed for large, high compression (11:.5-13:1) engines that have requirements that production cams cannot fill. Popular choice for all-out hot rods but has strong mid-range and good valve control for longevity and yes street use. Requires head spacing, use premium valve springs and valve gear parts, Best results when used with Baisley Pro Geometry roller rockers.

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 is here to help, if you have a question(s) please scroll down and fill out the form and hit send. We will review your question(s) and we will be in contact.

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Rivera/Primo Starter Gears

Rivera®

$0.00

If you’ve broken teeth on your starter ring gear, there is no reason to buy an entire new clutch shell. Primo’s replacement starter ring gears are made from high grade, heat treated steel and are designed to bolt onto the factory shell after the original equipment gear has been removed. *Select the radio button next to item of your choice from the options below, then click add to cart*

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Rocker Arm Shims

$0.00

If you have excessive rocker arm end play you can use these shims to reduce the end play in any rocker with excessive play. Shims must be installed on the non-thrust side of the arm (left side on intake, right side on exhaust). Be sure not to make the end play too tight as you can damage the shims. We suggest min end play @ .010 when using shims.

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Rod Bearing & Races

$0.00

Engine Rebuild Parts Quality bearings, bushings, races and other parts for engine rebuild and upgrades. Proven parts that will provide years of faithful service.

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S&S 3-5/8” Bore Pistons for 96” EV Engines

S&S®

$0.00

Flat top pistons for use with stock style heads.

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.

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S&S 3.927” Bore Pistons for Twin Cam® Engines

S&S®

$0.00

Flat top pistons increase displacement in ’99-’06 88” Twin Cam® engines to 97”; from 96” to 106” in ’07-up engines. Special head gaskets and cylinder machining required.

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.

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S&S 4-1/8” Bore Pistons for 124” EV/TC Engines

S&S®

$0.00

Flat top pistons for S&S® 124” SSW+ engines.

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.

*Please select the radio button next to item of your choice from the options below, then click add to cart*

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S&S 4” Bore Pistons for 100-107-113” EV Engines

S&S®
$0.00
Flat top pistons for S&S® Super Stock® 4” heads.
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.
***Please select the radio button next to item of your choice from the options below, then click add to cart*
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S&S Air Filter Kit Backplates
$0.00
Replacement back plates for S&S air filter kits. Available separately for repairs or maintenance.
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.

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S&S Air Filter Kits for EFI Models
$0.00
S&S air cleaners for EFI--add the famous classic teardrop air cleaner assembly to your ride. Replacement back plates, covers and filter elements for S&S applications available separately for repairs or maintenance.
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.

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S&S Air Filter Kits for Stock, CV and E/G Carb Models
$0.00
S&S air cleaners for stock carb and S&S E/G carbs--add the famous classic teardrop air cleaner assembly to your ride. Replacement back plates, covers and filter elements for S&S applications available separately for repairs or maintenance.
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.

Please choose your application below then select the radio button next to the item to purchase, then add to cart

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S&S Crankshafts for Twin Cam® Engines

S&S®
$0.00
Want the strongest foundation for your Twin Cam® engine? Let us supply you with a new S&S® crankshaft assembly.
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S&S® Single-Cam & EV Sportster® Crankshafts

S&S®
$0.00
These S&S® crankshaft assemblies are perfect for reconditioning and high performance applications. These crankshafts are balanced and assembled by S&S® with standard diameter flywheels and S&S® heavy-duty rods. We can supply you with a balanced, assembled and trued crankshaft, stock stroke or stroker, that’s ready to install in your case.
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S&S® Base Gaskets

S&S®
$0.00
S&S® Base Gaskets - Micropore cylinder base gaskets specific to S&S® engines, sold each. Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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S&S® Complete Engine Gasket Kits

S&S®
$0.00
S&S® Complete Engine Gasket Kits are complete overhaul gasket sets for S&S® engines. Due to engine options, kits may include gaskets not required in some applications. Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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S&S® Twin Cam® ‘A’ Style Engine Cases

S&S®
$0.00
S&S® Twin Cam® ‘A’ style (non-counterbalanced) engine cases are available for the builder who wants to replace a worn out set or use as a rock-solid foundation for a large displacement engine.
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S&S® Head Gaskets

S&S®
$0.00
Cylinder head gaskets specific to S&S® engines, one-piece style unless otherwise noted, sold each. Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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S&S® Pinion Shaft Conversion Kits

S&S®
$0.00
Over the years, H-D® has made design changes in the cam drive system that compromised strength when output of the engine was increased. There have been many cases of the pinion gear shearing the key and spinning on the shaft, causing the valve train to crash in performance applications. S&S® crankshafts use the earlier, stronger design.
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S&S® Shafts For S&S® And O.E. Flywheels

S&S®
$0.00
“Some shafts drive you nuts... our shafts come with them!” is the slogan from S&S®. Sprocket shafts are specially designed with oversize 6 degree tapers and heavy-duty keyways for use with like-machined S&S ® flywheels. Big Twin pinion shafts can be used in S&S® or factory flywheels that have replaceable shafts. And, as stated, all come with the hardware required to install them into the flywheels.
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Zipper’s Stage 1.8 CNC Twin Cam® Heads
$0.00
The Stage 1.8 is a fully CNC Ported head designed for 95, 98, 103, or 107 engines. The 1.850” O.S. Valves, new guides and 7mm conical springs. The application allows use with OE piston with shallow valve pockets or engine builder looking for little extra low end response. The head gasket surface will be decked to assure a true/flat sealing surface. Combustion chamber volume is approximately 85-86.5 cc.
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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Zipper’s Stage II CNC Twin Cam® SportMax Heads

Zipper's
$0.00
Our Stage II CNC heads employ special high velocity ports developed specifically for riders in search of early torque with broad power. With ports designed for high-velocity airflow, matching these heads with the proper camshaft and exhaust produces amazing power. Perfect for riders of heavier machines who want great acceleration just by turning the throttle - no rowing of the gearbox and high RPM needed!
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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Zipper’s Stage III CNC Ported Heads ThunderSport

Zipper's
$0.00
Our Stage III ThunderSport heads are the perfect choice for 3.875 - 3.937” bore Twin Cam® engines with all the highs - high compression, high flow throttle body, high flow exhaust and high output at all RPM’s! Our original design has been fully refined to fulfill the airflow needs of the highly modified Twin Cam® engine with displacement ranging from 95 to 107 cubic inches.
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
*To purchase item(s) below select the radio button next to item of your choice, then click add to cart*.

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Zipper’s Stage III CNC Heads for CVO 110 & 120R/ST Engines

Zipper's
$0.00
Zipper’s has developed these Stage III heads specifically for CVO 110 and 120R/ST engines to increase port velocity and the result is a huge power increase for these thirsty engines! This unique design delivers an awesome experience, with broad power for all types of riding. Installed on a 110 with Red Shift 657 cams, these heads put over 129 HP through the rear tire with a conservative 10.3:1 compression! Other high output applications are also available.
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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Single Cam Big Twin Cam Bearings
$11.95
Engine Rebuild Parts Quality bearings, bushings, races and other parts for engine rebuild and upgrades. Proven parts that will provide years of faithful service.
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Sprocket Shaft Bearings
$0.00
Engine Rebuild Parts Quality bearings, bushings, races and other parts for engine rebuild and upgrades. Proven parts that will provide years of faithful service.
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Spyke Hi-Torque Starter Ring Gears

Spyke®
$0.00
Got a late model, big output engine that eats starter ring gears? This kit converts the 1994-2006 102 tooth starter ring gear back to the stronger 66 tooth style used in 1993 and earlier models. Kit includes a 9 tooth pinion gear and 66 tooth ring gear. Requires removal of the factory ring gear which is riveted to the clutch shell and enlarging the existing holes to 5/16”. New ring gear bolts on using 5/16” bolts provided.
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Spyke On-Board Starter Button

Spyke®
$0.00
When only the bare minimum will do! The Spyke On-Board Starter Button replaces the stock end cap on 1989 2006 style starters with this chrome plated, billet unit that incorporates the starter button within it. Just push it in and the solenoid engages the starter motor-it cranks for as long as you hold it. No handlebar switch, no wiring, no starter relay (and no key!). Use for racers or show bike for that “minimalist” look.
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Spyke Starter Jackshaft Assembly

Spyke®
$0.00
Get all the starter jackshaft pieces in one part number. Great for scratch-build projects.
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