Dirt Bike Exhaust Replacement Parts
Dirt Bike Exhaust Replacement Parts: O-Rings, Springs & Packing for FMF & Moose at JJ Motorsports
Keep your dirt bike's exhaust system in top shape with premium replacement parts from JJ Motorsports, designed for easy maintenance and peak performance in motocross, enduro, and trail riding. Our selection includes durable O-rings, heavy-duty springs, and high-performance packing materials for secure seals, vibration resistance, and heat insulation. Compatible with FMF and Moose Racing mufflers on Honda CRF, Yamaha YZ/WR, KTM SX/EXC, and more, these OEM-quality components ensure leak-free operation, reduced noise, and long-lasting durability in dusty, high-heat conditions. From FMF's silicone O-rings for end cap seals to Moose's 95mm springs and Spec 19 packing for quick re-packs, refresh your exhaust without the hassle of full replacements.
Shop trusted brands like FMF and Moose Racing for race-proven quality. Explore related categories such as dirt bike silencers and mufflers for full systems or dirt bike exhaust for headers and tips.
Top Dirt Bike Exhaust Replacement Parts
- FMF Exhaust O-Rings 014893 – Silicone O-ring set for FMF muffler end caps; ensures airtight seals and vibration resistance for reliable performance.
- Moose Racing Exhaust Springs 95mm 495-9500 – Heavy-duty 95mm springs for secure muffler mounting; zinc-plated for corrosion resistance and easy installation.
- Moose Racing Spec 19 Competition Packing 750g 14584 – High-temp fiberglass packing for 2-stroke mufflers; 750g jar provides multiple re-packs for sustained sound and flow.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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FMF RCT End Cap - Carbon Fiber 040643
FMF
$129.99A quality end cap is essential for protecting your exhaust system's internals from debris, moisture, and corrosion while maintaining optimal backpressure and performance. The FMF RCT Carbon Fiber End Cap delivers lightweight construction without...18600563- SKU:
- 18600563
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- END CAP STYLE:
- EURO
- PRODUCT NAME:
- END CAP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- CARBON FIBER
- OUTSIDE DIAMETER IMPERIAL:
- 4'
- MODEL:
- FACTORY 4.1 RCT
- TYPE:
- EXHAUST
$129.99 -
FMF Muffler Sleeve - Aluminum 040652
FMF
$19.99A worn muffler sleeve compromises both exhaust flow and system integrity, leading to increased backpressure and potential exhaust leaks that rob your engine of power. The FMF Muffler Sleeve 040652 is a direct replacement that restores optimal exhaust...18600582- SKU:
- 18600582
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- LENGTH IMPERIAL:
- 4'
- RIDING STYLE:
- UTV
- TYPE:
- MID PIPE INLET SLEEVE INSERT
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- INSERT
- RIDING STYLE:
- ATV
- STYLE:
- ROUND
$19.99 -
FMF Exhaust O-Ring Kit - KTM 014803
FMF
$12.99Exhaust O-ring deterioration leads to air leaks, power loss, and failed emissions tests—problems that compound quickly under racing conditions. FMF's OEM-spec replacement kit restores the critical seal between exhaust components, ensuring optimal...18600607- SKU:
- 18600607
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- O-RING
- TYPE:
- EXHAUST
- UNITS:
- PAIR
$12.99 -
FMF Quiet Core Spark Arrestor Insert - Q4 Hex 040671
FMF
$39.99If you're running a 4-stroke off-road bike in areas with strict spark arrestor regulations, a clogged or damaged insert tanks your performance and invites fines. The FMF Quiet Core Spark Arrestor Insert keeps your exhaust flowing freely while staying...18600701- SKU:
- 18600701
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- SCREEN INSERT
- TYPE:
- SPARK ARRESTOR
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- Q4 HEX
$39.99 -
FMF Spark Arrestor - Powercore 4 Hex 040670
FMF
$29.99If you're running off-road or in fire-restricted areas, a spark arrestor isn't optional—it's mandatory. The FMF Powercore 4 Hex insert delivers reliable spark suppression while maintaining exhaust flow, keeping your 4-stroke engine legal and compliant...18600703- SKU:
- 18600703
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- SCREEN INSERT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MODEL:
- POWERCORE 4 HEX
- TYPE:
- SPARK ARRESTOR
$29.99 -
FMF Exhaust O-Rings 014822
FMF
$12.99A leaking exhaust system compromises engine performance, increases emissions, and creates safety hazards. FMF Exhaust O-Rings 014822 provide a reliable, low-cost seal replacement that restores your exhaust system's integrity without requiring a complete...18600931- SKU:
- 18600931
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- RUBBER
- TYPE:
- EXHAUST
- UNITS:
- PAIR
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- OFF-ROAD
$12.99 -
FMF Exhaust O-Rings 014823
FMF
$12.99Exhaust system leaks compromise both performance and longevity, often going unnoticed until damage compounds. FMF Exhaust O-Rings (014823) provide a precision seal at critical exhaust joints, preventing hot gas escape and maintaining backpressure...18600932- SKU:
- 18600932
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- RUBBER
- TYPE:
- EXHAUST
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
$12.99 -
FMF Exhaust O-Rings 014824
FMF
$12.99Exhaust O-rings are critical sealing components that prevent leaks at pipe connections, maintaining system integrity and performance efficiency. A worn or degraded O-ring compromises exhaust flow, increases emissions, and can lead to costly secondary...18600933- SKU:
- 18600933
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
- PRODUCT NAME:
- O-RING
- MATERIAL:
- RUBBER
- TYPE:
- EXHAUST
$12.99 -
FMF Universal Strap 020480
FMF
$24.99Securing your FMF muffler or spark arrestor properly is essential for maintaining exhaust system integrity during aggressive riding or racing conditions. This universal strap prevents vibration-induced loosening and rattling that can compromise...18600935- SKU:
- 18600935
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- STRAP
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- UTV
- TYPE:
- MOUNTING STRAP
$24.99 -
FMF Wrap Decal - Mini Replacement 014851
FMF
$16.99FMF's wrap decals deliver authentic branding and professional aesthetics to your exhaust system while protecting against UV fade and weathering. Whether you're restoring original factory appearance or customizing your build, this mini replacement decal...18602113- SKU:
- 18602113
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- COLOR/FINISH:
- YELLOW
- GRAPHIC:
- FMF LOGO
- BASE COLOR:
- BLACK
- BASE COLOR:
- RED
- BASE COLOR:
- YELLOW
- STYLE:
- FACTORY 4.1 MINI
- TYPE:
- EXHAUST
- UNITS:
- EACH
- COLOR/FINISH:
- WHITE
- PRODUCT NAME:
- DECAL
$16.99 -
FMF Replacement Ring - Factory 4.1 RCT 040677
FMF
$5.99The FMF Replacement Ring (040677) is an essential wear component for maintaining the integrity of your FMF 4-Stroke exhaust system. Over time, retaining rings experience fatigue from thermal cycling and vibration, compromising your exhaust's structural...18601050- SKU:
- 18601050
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RETAINING RING
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- REPLACEMENT COMPONENT
- UNITS:
- EACH
$5.99 -
DG PERFORMANCE Exhaust Springs - 52mm 98-1052
DG PERFORMANCE
$20.32Exhaust pipe vibration and movement cause premature cracking and mounting failure—especially under high RPM conditions. These DG Performance exhaust springs eliminate stress concentrations by allowing controlled flex at the attachment point, extending...18600964- SKU:
- 18600964
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- SPRING
- SPRING LENGTH - STATIC METRIC:
- 52 MM
- TYPE:
- EXHAUST
- UNITS:
- PAIR
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$20.32 -
DG PERFORMANCE Exhaust Springs - 58mm 98-1058
DG PERFORMANCE
$18.99Exhaust vibration and pipe movement can lead to cracks, mounting failures, and costly downtime. These stainless steel exhaust springs isolate your DG 4-stroke pipes from engine vibration while the free-floating design prevents stress concentrations that...18600963- SKU:
- 18600963
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STAINLESS STEEL
- SPRING LENGTH - STATIC METRIC:
- 58 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SPRING
- RIDING STYLE:
- UTV
- TYPE:
- EXHAUST
$18.99 -
FMF Replacement Rear Cone - 1.250" - Turbinecore 2 020464
FMF
$39.99FMF replacement rear cones are essential maintenance components for riders who demand consistent exhaust performance from their silencers. Over time, silencer end caps can crack, corrode, or sustain impact damage that compromises your exhaust system's...FMF020464- SKU:
- FMF020464
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ATV
- TYPE:
- END CAP
- UNITS:
- EACH
- COLOR/FINISH:
- STAINLESS STEEL
- OUTLET DIAMETER IMPERIAL:
- 1.250'
- BASE FINISH:
- NATURAL
- END CAP STYLE:
- CONICAL
- MODEL:
- TURBINECORE 2
- PRODUCT NAME:
- CAP
- RIDING STYLE:
- OFF-ROAD
$39.99 -
FMF Stainless Spring Kit - 4-Stroke 011396
FMF
$10.99Exhaust spring degradation is one of the most overlooked causes of poor exhaust sealing and performance loss in 4-stroke engines. The FMF Stainless Spring Kit replaces worn or fatigued OEM springs with premium stainless steel components that maintain...FMF011396- SKU:
- FMF011396
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- KIT
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- SPRING
- UNITS:
- PAIR
$10.99 -
FMF Spring and O-Ring Kit 011319
FMF
$12.99Exhaust system integrity directly impacts performance, durability, and emissions control. The FMF Spring and O-Ring Kit 011319 ensures a sealed, vibration-resistant connection at critical exhaust joints—preventing leaks that compromise power delivery and...FMF011319- SKU:
- FMF011319
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- UTV
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
$12.99 -
FMF Spring and O-Ring Kit 011318
FMF
$12.99Exhaust gasket degradation and o-ring wear are common failure points that compromise system integrity and create costly air leaks. The FMF Spring and O-Ring Kit 011318 restores proper sealing at the exhaust pipe connection, eliminating leaks that rob...FMF011318- SKU:
- FMF011318
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- O-RING
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$12.99 -
FMF Spring and O-Ring Kit 011317
FMF
$12.99Exhaust system seals degrade under sustained heat and vibration, causing performance losses and potential leaks that compromise your setup. The FMF Spring and O-Ring Kit 011317 restores critical sealing integrity at the exhaust pipe connection, ensuring...FMF011317- SKU:
- FMF011317
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- O-RING
- TYPE:
- EXHAUST
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$12.99 -
FMF Spring and O-Ring Kit 011316
FMF
$12.99Exhaust system degradation compromises both performance and longevity—worn springs and seals allow leaks that reduce scavenging efficiency and increase backpressure. The FMF Spring and O-Ring Kit 011316 restores proper exhaust sealing and pipe support,...FMF011316- SKU:
- FMF011316
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- O-RING
- TYPE:
- EXHAUST
$12.99 -
FMF Spring and O-Ring Kit 011315
FMF
$12.99Exhaust system performance hinges on reliable sealing and proper spring tension—degraded o-rings and worn springs lead to leaks, power loss, and exhaust gas bypass that undermines your tuning work. The FMF Spring and O-Ring Kit 011315 restores critical...FMF011315- SKU:
- FMF011315
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$12.99
