BOYESEN Rad Valve Intake Boot for HONDA CR 125, HUSQVARNA CR 125, YAMAHA YZ 125 and KAWASAKI KX 125 1988-1999

The BOYESEN BOYRB-3 Rad Valve intake boot is designed for YAMAHA YZ 125, HONDA CR 125, KAWASAKI KX 125 and HUSQVARNA CR 125 from 1988 to 1999. This intake boot connects the carburettor to the Boyesen Rad Valve reed valve block on a two-stroke engine. It has to seal perfectly: an air leak at this point leans out the mixture and makes the engine run hot.

Specifications

• Brand: BOYESEN
• Manufacturer part number: BOYRB-3
• EAN code: 804429503803
• Weight: 300 g
• Engine: 2-stroke

When to replace it?

• Boot hardened, cracked or distorted.
• Unstable idle or hanging revs: possible air leak.
• Carburettor moving in the boot even with the clamp tight.

Check the boot every time you remove the carburettor or the reed valve block. Check the model and model years: it must match your Rad Valve reed block.

Fitting tips

1. Remove the carburettor, then the boot to be replaced.
2. Clean the mating surfaces and fit the new boot with a new reed block gasket.
3. Tighten the bolts in a criss-cross pattern to the specified torque, then push the carburettor fully into the boot and tighten its clamp.
4. Start the engine and check that it holds a steady idle.

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 RG-01 · BOYESEN RG-01A
• Reed petals : V FORCE · BOYESEN

Frequently asked questions

Will this boot fit without a Rad Valve block?
It's designed for a Boyesen Rad Valve reed block: check compatibility with your bike.

Compatibility

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

Fits:
HONDA CR 125 1999
HONDA CR 125 1998
HONDA CR 125 1997
HONDA CR 125 1996
HONDA CR 125 1995
HONDA CR 125 1994
HONDA CR 125 1993
HONDA CR 125 1992
HONDA CR 125 1991
HONDA CR 125 1990
HONDA CR 125 1989
HONDA CR 125 1988
HUSQVARNA CR 125 1997
HUSQVARNA CR 125 1996
HUSQVARNA CR 125 1995
HUSQVARNA CR 125 1994
HUSQVARNA CR 125 1993
HUSQVARNA CR 125 1992
KAWASAKI KX 125 1991
KAWASAKI KX 125 1990
KAWASAKI KX 125 1989
KAWASAKI KX 125 1988
YAMAHA YZ 125 1992
YAMAHA YZ 125 1991
YAMAHA YZ 125 1990
YAMAHA YZ 125 1989
YAMAHA YZ 125 1988