How to Install a Pro Moto Billet Spark Arrestor on Honda CRF450R / CRF450RX (2017-2020)

The Pro Moto Billet PMB-01-1117 Spark Arrestor converts your stock CRF450R or CRF450RX dual mufflers into U.S.F.S. approved spark-arrested exhaust systems. This guide simplifies the factory instructions into a clean, step-by-step process for CRFsOnly.com customers.

⚠️ Before You Start

• Read all instructions completely before starting.
• This kit includes left and right side end caps — proper installation side matters.
• You will not reuse the stock end caps.
• If you are not comfortable modifying exhaust components, have installation performed by a qualified technician.

🧰 Parts Included

• 1 Right Side Spark Arrestor Base
• 1 Left Side Spark Arrestor Base
• 2 Nozzles
• 2 Spark Arrestor Screens
• M5 Mounting Bolts
• Self-tapping Screws

🛠️ Tools Required

• Drill
• 13/64" drill bit
• Allen wrenches
• Flat screwdriver
• Hammer
• Center punch
• High-temp silicone sealant
• Heat gun (recommended)
• Utility knife

🔧 Step-by-Step Installation

Step 1: Remove Mufflers and End Caps

Remove the side panels and mufflers per OEM instructions. Remove the bolts securing the stock end caps, then pull the end caps and internal baffles out of both mufflers. :contentReference[oaicite:0]{index=0}

Step 2: Break Seal and Remove End Caps

If the stock end caps are difficult to remove, cut the factory sealant with a knife and use a heat gun to loosen the canister. Locking pliers may be used if necessary.

Step 3: Clean Muffler Interior

Remove all leftover sealant and any rivet debris from inside the muffler packing material before installing the new components. :contentReference[oaicite:1]{index=1}

Step 4: Identify Left and Right Bases

Each spark arrestor base is labeled:

• “R” = Right (Throttle Side)
• “L” = Left (Clutch Side)

Install each base on the correct side with the label facing upward. :contentReference[oaicite:2]{index=2}

Step 5: Apply High-Temp Silicone

Apply a thin layer of high-temp RTV silicone around the stepped portion of each spark arrestor base. This ensures a proper seal and reduces vibration.

Step 6: Install Spark Arrestor Bases

Insert each base into the muffler until fully seated. Drill a 13/64" hole at each mounting location and install the self-tapping screws one at a time, keeping pressure on the base to ensure a tight fit. :contentReference[oaicite:3]{index=3}

Step 7: Clean Excess Sealant

Wipe away any excess silicone after both bases are installed.

Step 8: Install Screens and Nozzles

Insert the spark arrestor screens into each side, followed by the nozzles. Secure using the supplied M5 bolts (short bolt on top, long bolt on bottom). :contentReference[oaicite:4]{index=4}

Step 9: Reinstall Exhaust System

Reinstall the mufflers, side panels, and seat.

🛠️ Maintenance & Inspection

• Inspect spark arrestor screens regularly.
• Recommended: check during every air filter cleaning or oil change.
• Clean screens to maintain airflow and performance.

⚠️ Important Safety Notice

A spark arrestor with a damaged or clogged screen will not function properly. Replace or service immediately if any damage is found. :contentReference[oaicite:5]{index=5}

Shop CRF450R/RX Spark Arrestor

👉 Shop Pro Moto Billet Spark Arrestor - PMB-01-1117