BOYESEN Reed Valve for YAMAHA YZ 85 2002-2021

The BOYESEN BOYRAD-30C reed valve block is designed for YAMAHA YZ 85 from 2002 to 2021. On a two-stroke, the reed valve block sits between the carburettor and the engine. Its petals open under suction and close again as soon as the pressure reverses: the engine's pick-up and power depend on how quickly they react and how much air gets through.

Specifications

• Brand: BOYESEN
• Manufacturer part number: BOYRAD-30C
• Weight: 300 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.

Why BOYESEN?

Boyesen is an American brand specialising in the intake and the engine covers of two-stroke engines: reed petals, RAD Valve reed blocks, engine covers and Supercooler water pumps.

Spare parts and items to plan

• Reed block gasket : BOYESEN · V FORCE
• Reed petals : BOYESEN · TECNIUM
• Spark plug : NGK 6801 · NGK 3830

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:
YAMAHA YZ 85 2021
YAMAHA YZ 85 2020
YAMAHA YZ 85 2019
YAMAHA YZ 85 2018
YAMAHA YZ 85 2017
YAMAHA YZ 85 2016
YAMAHA YZ 85 2015
YAMAHA YZ 85 2014
YAMAHA YZ 85 2013
YAMAHA YZ 85 2012
YAMAHA YZ 85 2011
YAMAHA YZ 85 2010
YAMAHA YZ 85 2009
YAMAHA YZ 85 2008
YAMAHA YZ 85 2007
YAMAHA YZ 85 2006
YAMAHA YZ 85 2005
YAMAHA YZ 85 2004
YAMAHA YZ 85 2003
YAMAHA YZ 85 2002