Yamaha YZ 125 Parts — Dirt Motorcycle

The TurbineCore 2 020357 silencer from FMF Racing features the exclusive Turbine Dampening System, making it the premier spark arrestor on the market. With a straight-through design and a performance flow stainless steel end cap, this exhaust provides both exceptional durability and unrestricted power on the track and trail. It is fully U.S. Forest Service legal, making it a trusted option for riders demanding both compliance and performance. Features Exclusive Turbine Dampening System for superior spark arrestor function U.S. Forest Service legal for off-road use Straight-through silencer design maximises exhaust flow Built with a performance flow stainless steel end cap for strength and durability Lightweight construction at just 2.6 lbs Proven unrestricted power for competitive and recreational use Specifications Item ID: 020357 Type: Silencers Spark Arrestor: Internal Carb Warning: No Weight: 2.6 lbs Vehicle Fitment Yamaha YZ125 (1996–1999) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1999 YAMAHA YZ 125 1996-1998

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FMF Racing’s Powercore 2 Shorty silencer, model 020261, is engineered for riders seeking improved low- and mid-range throttle response in technical and supercross track environments. Its shortened inner core and lightweight aluminium canister deliver a precise balance of enhanced performance and agility, making it a superb bolt-on upgrade for demanding race scenarios. Features Specially shortened inner core design boosts bottom and mid rpm power Lightweight aluminium canister supports agile handling and easy installation Delivers crisp throttle response for tight and technical tracks Bolt-on performance solution for competitive riders Designed for two-stroke applications and supercross tracks Specifications FMF Item ID: 020261 Product type: Silencer Weight: 1.6 lbs Carb compliant: No Vehicle Fitment Yamaha YZ125 (1996–1999) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1999 YAMAHA YZ 125 1996-1998

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The Turbinecore 2.1 is recognised as the world’s bestselling spark-arrested exhaust, engineered for both track and trail enthusiasts. Utilising FMF’s exclusive Turbine Dampening System, this silencer provides unrestricted power while achieving legal compliance for off-road environments. Its straight-through spark arrestor canister, paired with a performance flow stainless steel end cap, ensures exceptional strength, durability, and longevity. Lighter than stock and race-tested for smooth power delivery across the RPM range, the Turbinecore 2.1 delivers a crisp, distinctive sound and is suitable for both FMF and stock pipes. Features World’s bestselling spark arrestor silencer with U.S. Forest legal status Straight-through design ensures unrestricted performance Exclusive Turbine Dampening System prevents clogging and potential engine damage Larger diameter aluminium canister increases tunability and extends packing life Delivers a smooth, race-proven power curve across the entire RPM range Crisp, distinctive exhaust note Significantly lighter than standard equipment Precision-built from aluminium and stainless steel for strength and durability Internal spark arrestor for legal compliance on public land Specifically engineered for seamless fitment with FMF or OEM pipes Manufactured in-house by FMF in the USA Specifications Item ID: 024061 Type: Silencer Configuration: Single outlet Construction: Aluminium canister Finish: Natural Midpipe: Stainless steel Endcap: Stainless steel Spark Arrestor: Internal Weight: 3.0 lbs (approx.) Carb Compliant: Not required Vehicle Fitment Yamaha YZ125 (2002–2021) YZ125X (2020–2022) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ X 125 2020-2021 YAMAHA YZ 125 2002-2004 YAMAHA YZ 125 2005-2021 YAMAHA YZ 125 2005-2020 YAMAHA YZ X 125 2020

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FMF Racing’s TurbineCore 2 024012 silencer is engineered with the exclusive Turbine Dampening System, setting the standard for power and compliance. Its straight-through design, paired with a robust stainless steel end cap, delivers enhanced durability while maximising performance—making it a leading choice for both track and trail riders. As the world’s top spark arrestor, this unit is U.S. Forest Service legal and purpose-built for extreme reliability and unrestricted power. Features Utilises FMF’s exclusive Turbine Dampening System for maximum performance Track and trail-proven straight-through spark arrestor canister design Stainless steel performance flow end cap for long-lasting durability Lightweight construction at 2.7 lbs reduces bike mass for agile handling Fully U.S. Forest Service legal for use in regulated riding areas Internal spark arrestor improves safety without sacrificing flow Specifications Item ID: 024012 Type: Silencer Spark Arrestor: Internal Weight: 2.7 lbs Carb Warning: No Vehicle Fitment Yamaha YZ125 (2002–2021) YZ125X (2020–2022) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ X 125 2020-2021 YAMAHA YZ 125 2002-2004 YAMAHA YZ 125 2005-2021 YAMAHA YZ 125 2005-2020 YAMAHA YZ X 125 2020

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The FMF Racing Titanium Powercore 2.1 024060 delivers advanced silencing technology with a lightweight titanium build and a striking blue anodised finish. Designed for high-performance off-road motorcycles, this single-configuration silencer features a robust stainless steel midpipe and a precision-engineered titanium endcap to provide superior durability and optimised power output for competitive riders. Features Item ID: 024060 Type: Silencers Configuration: Single Construction: Titanium Finish: Blue Anodized Midpipe: Stainless Steel Endcap: Titanium No carburettor warning required Lightweight at only 3.0 lbs Specifications Weight: 3.0 lbs Material: Titanium (silencer and endcap), Stainless Steel (midpipe) Finish: Blue anodised Application: Off-road motorcycles Vehicle Fitment Yamaha YZ125 (2002–2021) YZ125X (2020–2022) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ X 125 2020-2021 YAMAHA YZ 125 2002-2004 YAMAHA YZ 125 2005-2021 YAMAHA YZ 125 2005-2020 YAMAHA YZ X 125 2020

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The FMF Racing Shorty 024010 exhaust silencer builds on the renowned Powercore 2 design, featuring a reduced inner core length and a lightweight aluminium canister. Engineered for riders seeking enhanced bottom and mid-range power, this finely tuned, bolt-on silencer is particularly effective on tight circuits and supercross tracks, delivering crisp throttle response and improved power delivery in demanding conditions. Features Shortened inner core for maximised bottom and mid rpm performance Lightweight aluminium canister construction Tuned for optimal response on tight and supercross tracks Simple, bolt-on installation Item ID: 024010 Weight: 1.7 lbs Not subject to carburettor warning regulations Specifications Type: Silencer Material: Aluminium canister Weight: 1.7 lbs Vehicle Fitment Yamaha YZ125 (2002–2021) YZ125X (2020–2022) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ X 125 2020-2021 YAMAHA YZ 125 2002-2004 YAMAHA YZ 125 2005-2021 YAMAHA YZ 125 2005-2020 YAMAHA YZ X 125 2020

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The FMF Powercore 2.1 024059 silencer represents the next evolution in 2-stroke exhaust performance, bringing a race-tested smooth power curve to every ride. FMF's dedication to 2-stroke innovation is evident in the Powercore 2.1, featuring an enlarged canister for better tunability and extended packing life, all while delivering a crisp exhaust note and reducing overall weight. Engineered for seamless integration with both FMF and stock pipes, this silencer improves both track and trail riding experiences for Yamaha riders. Features Race-tested for a consistently smooth power curve across the RPM range Larger diameter canister enhances tunability and prolongs packing durability Lightweight design is lighter than OEM silencers Crisp, distinctive exhaust sound Compatible with FMF or stock exhaust pipes for flexible installation Constructed with a durable natural finish aluminium body and stainless steel midpipe and endcap Specifications Item ID: 024059 Type: Silencer Configuration: Single Construction: Aluminium Finish: Natural Midpipe: Stainless Steel Endcap: Stainless Steel Weight: 3.0 lbs Carb Warning: No Vehicle Fitment Yamaha YZ125 (2002–2021) YZ125X (2020–2022) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ X 125 2020-2021 YAMAHA YZ 125 2002-2004 YAMAHA YZ 125 2005-2021 YAMAHA YZ 125 2005-2020 YAMAHA YZ X 125 2020

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Built for riders seeking dependable performance, the FMF Racing Powercore 2 024009 sets the benchmark for 2-stroke silencers. Its lightweight extruded aluminium oval canister is paired with a perforated core, designed to deliver strong power gains and a crisp exhaust note. Durable stainless steel is utilised for both the performance flow end cap and the front stinger, resulting in a silencer that stands up to the most demanding riding conditions while delivering a professional appearance. Features Lightweight extruded aluminium oval canister enhances handling and acceleration Perforated core design for optimum power and throttle response Stainless steel performance flow end cap and front stinger for maximum durability Designed to improve overall engine performance on 2-stroke machines Item ID: 024009 No carburettor warning required Specifications Type: Silencer Weight: 1.8 lbs (approx. 0.82 kg) Vehicle Fitment Yamaha YZ125 (2002–2021) YZ125X (2020–2022) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ X 125 2020-2021 YAMAHA YZ 125 2002-2004 YAMAHA YZ 125 2005-2021 YAMAHA YZ 125 2005-2020 YAMAHA YZ X 125 2020

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The FMF Racing Shorty 020268 is engineered by refining the established Powercore 2 design. Featuring a shorter inner core and a lightweight aluminium canister, it delivers responsive bolt-on performance that enhances bottom to mid-range power. This silencer offers an immediate advantage on tight and supercross tracks, making it a top choice for riders seeking a competitive edge where immediate acceleration and throttle response are crucial. Features Designed with a shortened inner core for sharper bottom and mid-range response Lightweight aluminium canister ensures minimal additional weight Tailored for supercross and tight track performance Bolt-on installation for straightforward fitment Silencer type for optimal noise control without affecting power FMF Racing heritage ensures durability and reliability Specifications Item ID: 020268 Type: Silencers Weight: 1.7 lbs (0.77 kg) Carb Warning: No Vehicle Fitment Yamaha YZ125 (2000–2001) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2000-2001

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Boyesen Power Reeds for RL Rad Valves - RL-11 NOTE: Direct replacement reeds for Rad Valves -To determine if you have a RL or RR Rad Valve, look for a stamp RL in the casting; the RR Rad Valve does not have a stamp. FITS KTM FITTED WITH BOYESEN RAD BLOCKS ONLY. Honda CR125R 1988 - 1991 Kawasaki KX125 1988 - 1997 Suzuki RM125 1994 - 1997 Yamaha YZ125 1988 - 1998 Part No. 05-RL11 (radhouse.co.uk) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years HUSQVARNA CR 125 1995-1997 HONDA CR 125 1988-1991 KAWASAKI KX 125 1995-1997 YAMAHA YZ 125 1995-1998 SUZUKI RM 125 1995-1997

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Boyesen Replacement Boot KIT - RBK4 / RBK-4 - Replacement boot KIT for Boyesen Rad Valve. - With 2 Clips - Can be used as Univeral Carburetor boot. - Aprox Size. ID 40m / 46mm X Wide 28mm. Part No. 05-RB4.KIT (radhouse.co.uk) Honda CR125R 2000 - 2001 Kawasaki KX125 2001 Suzuki RM125 1989 - 1993 Yamaha YZ125 1989 - 1998 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1995-1998

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Boyesen Replacement Boot - RB4 / RB-4 - Replacement boot for Boyesen Rad Valve. - Can be used as Univeral Carburetor boot. - Aprox Size. ID 40m / 46mm X Wide 28mm. Part No. 05-RB4 (radhouse.co.uk) Honda CR125R 2000 - 2001 Kawasaki KX125 2001 Suzuki RM125 1989 - 1993 Yamaha YZ125 1989 - 1998 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1995-1998

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Boyesen Replacement Boot - RBK2 / RBK-2 - Replacement boot KIT for Boyesen Rad Valve. - Can be used as Univeral Carburetor boot. - Aprox Size. ID mm / mm X Wide mm. Part No. 05-RB2.KIT (radhouse.co.uk) Honda CR125R 2002 - 2003 Honda CR250R 2001 - 2004 Husqvarna WR250 1991 Kawasaki KX125 2002 - 2005 Kawasaki KX250 2003 Suzuki RM250 1990 - 1995 Yamaha WR250 1991 - 1995 Yamaha YZ125 1999 Yamaha YZ250 1989 - 1995 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KAWASAKI KX 125 2003 HONDA CR 125 2003 KAWASAKI KX 125 2004-2006 YAMAHA YZ 250 1997-1998 YAMAHA YZ 125 2000 HONDA CR 125 2002 KAWASAKI KX 125 2002 YAMAHA YZ 125 2001 YAMAHA YZ 125 1999

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Boyesen Replacement Boot - RB2 / RB-2 - Replacement boot for Boyesen Rad Valve. - Can be used as Univeral Carburetor boot. - Aprox Size. ID mm / mm X Wide mm. Part No. 05-RB2 (radhouse.co.uk) Honda CR125R 2002 - 2003 Honda CR250R 2001 - 2004 Husqvarna WR250 1991 Kawasaki KX125 2002 - 2005 Kawasaki KX250 2003 Suzuki RM250 1990 - 1995 Yamaha WR250 1991 - 1995 Yamaha YZ125 1999 Yamaha YZ250 1989 - 1995 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years KAWASAKI KX 125 2003 HONDA CR 125 2003 KAWASAKI KX 125 2004-2006 YAMAHA YZ 250 1997-1998 YAMAHA YZ 125 2000 HONDA CR 125 2002 KAWASAKI KX 125 2002 YAMAHA YZ 125 2001 YAMAHA YZ 125 1999

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Boyesen Replacement Boot KIT - RBK17 / RBK-17 - Replacement boot KIT for Boyesen Rad Valve. - With 2 Clips - Can be used as Univeral Carburetor boot. - Aprox Size. ID 46mm / 46mm X Wide 24mm. Part No. 05-RB17.KIT (radhouse.co.uk) Suzuki RM125 2001 - 2007 Yamaha YZ125 2001 - 2004 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2004 YAMAHA YZ 125 2003 YAMAHA YZ 125 2002 SUZUKI RM 125 2003 SUZUKI RM 125 2002 SUZUKI RM 125 2001 SUZUKI RM 125 2004-2007

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Boyesen Replacement Boot - RB17 / RB-17 - Replacement boot for Boyesen Rad Valve. - Can be used as Univeral Carburetor boot. - Aprox Size. ID 46mm / 46mm X Wide 24mm. Part No. 05-RB17 (radhouse.co.uk) Suzuki RM125 2001 - 2007 Yamaha YZ125 2001 - 2004 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2004 YAMAHA YZ 125 2003 YAMAHA YZ 125 2002 SUZUKI RM 125 2003 SUZUKI RM 125 2002 SUZUKI RM 125 2001 SUZUKI RM 125 2004-2007

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Boyesen Rad Valve - RAD-34E / RAD34E Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low-, middle- and especially the top-end ranges One-piece aluminum casting, no trimming or plastic inserts required Yamaha YZ250 1999 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 250 1999 YAMAHA YZ 125 2000

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Boyesen Rad Valve - RAD-33J / RAD33J Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low-, middle- and especially the top-end ranges One-piece aluminum casting, no trimming or plastic inserts required Yamaha YZ125 2005-2018 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2005-2019

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Boyesen Rad Valve - RAD-33I / RAD33I Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low-, middle- and especially the top-end ranges One-piece aluminum casting, no trimming or plastic inserts required Yamaha YZ125 2004, Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2004

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Boyesen Rad Valve - RAD-33G / RAD33G Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low-, middle- and especially the top-end ranges One-piece aluminum casting, no trimming or plastic inserts required Yamaha YZ125 2001-2002 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2002 YAMAHA YZ 125 2001

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Boyesen Rad Valve - RAD-33C / RAD33C Now delivered with carbon fiber reeds for even greater performance gains Maintains flow velocity through the valve and redirects intake charge for more even distribution to the intake ports Sharper, quicker throttle response Added torque improves performance on hills, through corners and over technical jumps Increases horsepower in low-, middle- and especially the top-end ranges One-piece aluminum casting, no trimming or plastic inserts required Yamaha YZ125 1995-1998 Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1995-1998

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Boyesen Pro Series Reeds - PRO-53 Get the edge of Boyesens patented dual-stage reed design plus the latest in carbon fiber technology Carbon fiber top reed and a durable fiberglass/epoxy bottom reed Features the quickest acceleration any reed can offer while maximizing horsepower and torque Quick and precise response to changes in piston speed delivers smooth, dependable throttle response You wont sacrifice reed life as you might with traditional carbon fiber reeds Created for the newest 2-stroke technologies Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1988-1992

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Boyesen Pro Series Reeds - PRO-49 Get the edge of Boyesens patented dual-stage reed design plus the latest in carbon fiber technology Carbon fiber top reed and a durable fiberglass/epoxy bottom reed Features the quickest acceleration any reed can offer while maximizing horsepower and torque Quick and precise response to changes in piston speed delivers smooth, dependable throttle response You wont sacrifice reed life as you might with traditional carbon fiber reeds Created for the newest 2-stroke technologies Yamaha Part No. 05-P58 (radhouse.co.uk) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 1993 YAMAHA YZ 125 1980-1987

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Boyesen Pro Series Reeds - PRO-33 - Get the edge of Boyesens patented dual-stage reed design plus the latest in carbon fiber technology - Carbon fiber top reed and a durable fiberglass/epoxy bottom reed - Features the quickest acceleration any reed can offer while maximizing horsepower and torque - Quick and precise response to changes in piston speed delivers smooth, dependable throttle response - You wont sacrifice reed life as you might with traditional carbon fiber reeds - Created for the newest 2-stroke technologies Sold as Pairs Part No. 05-P33 (radhouse.co.uk) Vehicle Compatibility Please check the exact model and year before ordering. Manufacturer Model Years YAMAHA YZ 125 2005-2019

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