How to Install a Pro Moto Billet Spark Arrestor on Honda CRF450R / CRF450RX (2021-2026) & CRF250R / CRF250RX (2022-2026)

The Pro Moto Billet PMB-01-1119 Spark Arrestor converts the stock muffler on the latest generation Honda CRF450R, CRF450RX, CRF250R, and CRF250RX models into a U.S.F.S. approved spark-arrested exhaust system. This guide simplifies the manufacturer instructions into a clean, step-by-step format for CRFsOnly.com customers.

⚠️ Before You Start

• Read all instructions completely before starting.
• This installation applies to both CRF450R/RX and CRF250R/RX models using the same muffler design.
• You will reuse the stock end cap O-ring on the new spark arrestor base.
• If you are not comfortable modifying exhaust components, have installation performed by a qualified technician.

🧰 Parts Included

• 1 Spark Arrestor Base
• 1 Nozzle
• 1 Screen
• 2 M5x16 Socket Head Bolts
• 1 M5x30 Socket Head Bolt
• 8 Self-Tapping Screws

🛠️ Tools Required

• Drill
• 13/64" drill bit
• Flat screwdriver
• Hammer
• Allen wrenches
• High-temp silicone sealant

🔧 Step-by-Step Installation

Step 1: Remove the Stock End Cap

Remove the bolts securing the stock end cap and pull it from the muffler. If needed, apply heat to loosen the seal.

Step 2: Transfer the O-Ring

Remove the O-ring from the stock end cap and install it onto the new spark arrestor base.

Step 3: Apply High-Temp Silicone

Apply a small amount of high-temp RTV silicone to the stepped portion of the new base.

Step 4: Install the Spark Arrestor Base

Insert the base into the muffler and push it firmly into place. Ensure the O-ring seats correctly.

Step 5: Drill and Secure

Drill each mounting hole and install self-tapping screws one at a time. Keep pressure on the base to ensure a tight fit.

Step 6: Clean Excess Sealant

Wipe away any excess silicone.

Step 7: Install Screen and Nozzle

Insert the spark arrestor screen and install the nozzle. Use the longer M5 bolt in the bottom hole.

🛠️ Maintenance & Inspection

• Inspect spark arrestor screen regularly.
• Check during every air filter service or oil change.
• Clean or replace screen if clogged or damaged.

⚠️ Important Safety Notice

A damaged or clogged spark arrestor will not function properly. Regular inspection is required to maintain performance and trail compliance.

Shop CRF450R/RX & CRF250R/RX Spark Arrestor

👉 Shop Pro Moto Billet Spark Arrestor - PMB-01-1119