V-FORCE Reed Valve for YAMAHA YZ 125 and FANTIC XE 125, XX 125 2005-2027

The V-FORCE MTV4R04 reed valve block is designed for FANTIC XE 125, XX 125 and YAMAHA YZ 125 from 2005 to 2027. On a two-stroke, the reed valve block meters the mixture into the crankcase. A complete reed valve block replaces the original cage and petals in one go.

Specifications

• Brand: V-FORCE
• Manufacturer part number: MTV4R04
• Weight: 280 g
• Engine: 2-stroke

Who is it for?

• Original cage damaged, or petals wearing out again and again.
• You want more pick-up and response when you open the throttle.

Good to know

Check the petals at every piston change and replace them as soon as a tip is chipped.

Fitting tips

1. Clean the gasket face of the cylinder or crankcase.
2. Fit the reed valve block with a new gasket, petals facing the engine.
3. Tighten the screws in a criss-cross pattern to the recommended torque.
4. Check the carburation and the colour of the spark plug after the first few rides.

Spare parts and items to plan

• Reed block gasket : BOYESEN · V FORCE
• Reed petals : V FORCE · BOYESEN
• Spark plug : NGK 3530 · NGK 3230

Frequently asked questions

Do I need to change the jetting?
Usually not; check the colour of the spark plug after the first few rides and adjust if needed.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
FANTIC XE 125 2026
FANTIC XE 125 2025
FANTIC XE 125 2024
FANTIC XE 125 2023
FANTIC XE 125 2022
FANTIC XX 125 2026
FANTIC XX 125 2025
FANTIC XX 125 2024
FANTIC XX 125 2023
FANTIC XX 125 2022
FANTIC XX 125 2021
YAMAHA YZ 125 2027
YAMAHA YZ 125 2026
YAMAHA YZ 125 2025
YAMAHA YZ 125 2024
YAMAHA YZ 125 2023
YAMAHA YZ 125 2022
YAMAHA YZ 125 2021
YAMAHA YZ 125 2020
YAMAHA YZ 125 2019
YAMAHA YZ 125 2018
YAMAHA YZ 125 2017
YAMAHA YZ 125 2016
YAMAHA YZ 125 2015
YAMAHA YZ 125 2014
YAMAHA YZ 125 2013
YAMAHA YZ 125 2012
YAMAHA YZ 125 2011
YAMAHA YZ 125 2010
YAMAHA YZ 125 2009
YAMAHA YZ 125 2008
YAMAHA YZ 125 2007
YAMAHA YZ 125 2006
YAMAHA YZ 125 2005