How to Install Performance Machine C4 Air Cleaner on a Harley-Davidson Milwaukee 8

C4 Air Cleaner Installation Overview

• 🏍️ This guide demonstrates the installation of the Performance Machine C4 air cleaner on Milwaukee 8 powered Harley-Davidson motorcycles, applicable to both Softails and Baggers.
• 🛠️ The process requires basic hand tools and can be completed in under an hour, even on a garage floor without a lift.

Installing the Crossover Bracket and Breather Hoses

• 🔧 First, install the crossover bracket, ensuring the cutout indicates the correct orientation.
• 🔩 For aftermarket throttle bodies, the bracket is installed without screws; for stock throttle bodies, use provided screws torqued to 84 ft-lbs.
• 💧 Attach the short breather hose to the front head using a breather bolt, crush washer, and black washer, threading it finger-tight.
• 💨 Repeat the process for the longer breather hose on the rear head.

Attaching the Backing Plate and Gasket

• ⚙️ Install the backing plate with its shroud facing the servo part of the throttle body.
• 📄 Place the provided gasket between the throttle body and the backing plate, aligning the half-moon cutout on the gasket with the throttle body cutout.
• 🔒 Use blue Loctite on the three 3/420 Allen screws (3/16 Allen) and torque them to 96 ft-lbs.

Connecting Breather Bolts and Finalizing Installation

• 🔩 Secure the breather bolts through the breather hoses, ensuring a crush washer is on both sides of each bolt, and thread them into the backing plate.
• 🔧 Torque these four breather bolts to 120 inch-lbs using a 9/16 socket.
• ✨ Attach the carbon fiber elbow using the gasket and three small 1/4-inch 12-point screws with Loctite, torquing them to 96 inch-lbs.
• 🧼 Wipe down the installed air cleaner to remove fingerprints, completing the "big fancy carbon fiber intake" upgrade.