Twin Cam®

Thunder Heart® Coil-Combo Twin Cam® Ignition

Thunder Heart®

$374.95

The Coil-Combo Digital Ignition is designed for use in custom bike applications where any engine equipped with a crank sensor (like a Twin Cam® or late EV) is going to be used. It consolidates all ignition components into a small, easy-to-mount package.

Add to cart

Timken® Spacers

$0.00

Use these hardened and ground spacers when converting 2003 and later Twin Cam® engine cases to a Timken® output bearing. These spacers will provide correct primary chain sprocket alignment when assembling the engine with the wider Timken® bearing.

View Details

Twin Cam® Bushings

$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.

View Details

Twin Cam® Crankcase 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.

View Details

Twin Cam® Engine Cam 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.

View Details

Twin Cam® Primary Cam Sprocket Spacers

$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. Use to align the primary cam chain sprocket with the pinion shaft sprocket. Sold as a set or individually.

View Details

USA-Made Economy HighFlow Air Filter Kits for EFI Models

$0.00

Here’s a nice USA-Made power increase that’s easy to install and easy on the budget! Bolt it on and feel the difference! NEW LOWER PRICE!

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.

View Details

USA-Made Economy MaxFlow Air Filter Kits for EFI Models

$0.00

Here’s a nice USA-Made power increase that’s easy to install and easy on the budget! Bolt it on and feel the difference! NEW LOWER PRICE!

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.

View Details

Variable Pressure Clutch (VPC)

$0.00

One of the less desirable byproducts of increased power is the need for a clutch spring upgrade, and the additional lever effort it requires. By adding the Variable Pressure Clutch (VPC) devise, clutch plate holding pressure is reduced at lower RPM’s, and increased as RPM rises, reducing the chance of clutch slippage as power builds. the VPC system reduces initial pressure and uses weights and centrifugal force to increase pressure as RPM builds. Clutch lever effort is reduced up to 50% at idle and low RPM, resulting in less hand fatigue, smoother engagement and easy neutral location.

View Details

Wiseco Twin Cam® 4-1/8” Big Bore Pistons

Wiseco®

$0.00

These 4-1/8” bore forged piston kits come complete with rings, wrist pins and circlips, and require 4-1/8” bore cylinders (case machining required). In compliance with ARB emissions laws, this product is not sold or shipped to California.

View Details

Wiseco Twin Cam® 4-1/8” Bore Stroker Pistons

Wiseco®

$0.00

Stroker flat-top pistons with wrist pin bore raised .125” (wrist pin centerline to piston deck height of 1.140”). Use with stroker crankshaft and appropriate length 4-1/8” bore cylinders for the stroke you’re using. In compliance with ARB emissions laws, this product is not sold or shipped to California.

View Details

Wiseco Twin Cam® 88” to 95” Big Bore Pistons

Wiseco®

$0.00

Lightweight ‘Slipper’ Design! 1/8” oversize pistons feature ArmorGlide™ skirt coating, a high-tech lubricant that reduces friction and allows the piston to be fitted tighter within the bore allowing a better ring seal and reduced noise from piston rock.

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

View Details

Wiseco Twin Cam® 96” to 103” Big Bore Pistons

Wiseco®

$0.00

View Details

Zipper’s CP Piston Kits For Milwaukee-Eight® Engines

Zipper's

$0.00

Turn your 107" M8 engine into a 117" by simply boring your stock cylinders! No case modifications necessary, the factory 107" can be safely bored from 3.937" to 4.125". These forged pistons are manufactured for us by CP-Carrillo in 3 different compression ratios (flat top compression ratio is 11.2:1 with an unmodified 87.5cc head) and feature 1.5mm compression rings with 3mm oil rings for superior oil control. Piston kits include pistons, rings, wrist pins and circlips. USA made!

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.

Click here for Zipper's Job Order Sheet

View Details

#413-990 Red Shift Cams® REPLACEMENT Dual Piston Tensioner Shoes

Red Shift Cams®

$22.95

Replacement Red Shift Dual Piston Tensioner Shoes

Add to cart

Zipper’s High Compression 110″ CVO Piston Kits

Zipper's

$0.00

Co-designed by Zipper's/Wiseco, these forged pistons have superior design features. See below for more details. In compliance with ARB emissions laws, this product is not sold or shipped to California.

View Details

Zipper’s Sport 107″ Kit for 2007-Up Twin Cam®

Zipper's

$0.00

Zipper's Sport 107” kit greatly improves the all-around power output of the 96 or 103” Twin Cam® engine. A great choice for the rider looking for strong acceleration. Over 100 ft/lbs of torque is available from 2,400 to 5,200 RPM, peaking at 115+ ft/lbs by 4,250. Horsepower is a linear line to 110+, peaking at just over 5,200 RPM - meaning you don’t have to run the RPM’s around the dial to move your big bike quickly and efficiently. Your cylinders are decked and sized for 3.937” forged pistons, while your heads are modified with Zipper's high velocity Stage 2 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: our 417-498 blueprinted cam chest/oil system upgrade for improved oil delivery, increasing reliability and durability. The Sport 107 puts way more ‘Sport’ in your riding experience! This kit uses your factory head and cylinder cores sent in for modification. An exchange may be possible once your cores are cleaned, inspected and qualified for exchange. *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 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.

View Details

Zipper’s Muscle 107″ Kit for 2007-2017 Twin Cam®

Zipper's

$0.00

Zipper’s Popular Muscle 107” Kit for Twin Cam® 96/103” engines boost torque and horsepower north of 120! The Muscle 107 is a top end and cam kit that gets its displacement boost by increasing the cylinder bore size to 3.937”, while retaining the factory 4-3/8” stroke. Your cylinder tops are decked for trueness and new 10.6:1 forged pistons are precision-fit using the latest Sunnen equipment, while your heads receive Zipper's high-breathing Stage III treatment with CNC porting, new guides, oversize valves and performance springs. Our Red Shift 577 cams are perfectly matched with the heads and piston to provide big torque & HP across the entire RPM range. Red Shift Dual-Piston cam tensioners are included with Pro-Taper pushrods for a stable valve train and EZ-Adjust covers, with all gaskets needed for assembly. Highly recommended option: our 417-498 blueprinted cam chest/oil system upgrade for improved oil delivery, increasing reliability and durability. This kit is for the aggressive rider that likes to regularly twist the wick and run up front! This kit uses your factory head and cylinder cores sent in for modification. An exchange may be possible once your cores are cleaned, inspected and qualified for exchange. *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 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.

View Details

Zipper’s Muscle 117″ Kit for 2007-2017 Twin Cam®

$0.00

Zipper’s Muscle 117” Kit for Twin Cam® 96/103” engines increases displacement with new 4-1/8” bore cylinders while retaining the factory 4-3/8” stroke. New cylinders are stress-relived before being fitted with 10.6:1 forged pistons using the latest Sunnen equipment, while your heads receive Zipper's high-breathing Stage III treatment with CNC porting, new guides, oversize valves and performance springs. Our Red Shift 577 cams are perfectly matched with the heads and piston to provide big torque & HP across the entire RPM range. Red Shift Dual-Piston cam tensioners are included with Pro-Taper pushrods for a stable valve train and EZ-Adjust covers, with all the gaskets needed for assembly. Case boring required for 4-1/8” cylinders, Timken® bearing conversion and cam chest/oil system upgrade recommended. Amazing increase in Power and Torque! This Kit uses your factory head cores sent in for modification. An exchange may be possible once your cores are cleaned, inspected and qualified for exchange. *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 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.

View Details

Zippers’s Muscle 124″ Kit for 1999-2006 BETA Twin Cam®

$5,525.00

*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.

Add to cart

Zipper’s Muscle 124″ Kit for 1999-2006 Twin Cam®

$6,449.00

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.

Add to cart

Zipper’s Step-Lock Valve Guides

Zipper's

$0.00

We’ve never been big fans of the shoulderless valve guides used by the factory in EV & TC heads, so we designed our own. Our ductile cast iron Step-Lock guides have a shoulder that helps set the guide to the correct depth, and, in the event that the engine is severely overheated causing the guide to come loose in the head, allows the lower valve spring collar to capture it, keeping it in place. The top side of the guide is machined to accept larger .531" ID seals while the port side is tapered to enhance flow around the guide. Requires use of stepped lower valve spring collars (our Crane spring kit collars work fine without modification). We offer lower collars to fit the spring kits we sell for use with these guides. Sold each.

View Details

Zipper’s Oversize Tappet Guide Pins

Zipper's

$0.00

These oversize tappet pins allow the builder to limit tappet rotation in the lifter bore; excessive rotation allows the lifter to side-load and cause operational issues. Red Shift recommends between .002” - .004” of clearance. Oversized pins are available in +.002” and +.006” sizes.

View Details

Zipper’s 1999-2006 Twin Cam® Oil Bypass Shim

Zipper's

$0.00

The Twin Cam® engine features an oil pressure bypass passage within the cam support plate that is controlled by a spring-loaded plunger. The purpose of this passage is to allow excess oil pressure to be diverted back to the feed section of the oil system.

View Details

Baisley® Oil Pressure Relief Valve Springs

Baisley®

$0.00

A. Baisley® Hi-Performance LMR-2: 6.2 lbs of Seat Force, 14.2 lbs fully compressed. Baisley® springs offer increased seat pressure and overall spring force. Baisley® springs operate in a progressive manner, and are precision ground to exact lengths. #626-002 B. Baisley Hi-Performance LMR-4: 7.0 lbs of Seat Force, 16.7 lbs fully compressedBaisley Hi-Performance springs operate in a progressive manner, and are precision ground to exact lengths. LMR-4 is best for use in large displacement engines with upgraded oil pumps and aggressive cams.#626-004

View Details