ELECTROSPORT Regulator for YAMAHA YFB 250 TIMBERWOLF 2WD, YFM 350 BIG BEAR 4WD, YFM 400 KODIAK 4WD 1993-1996

ELECTROSPORT offers this regulator rectifier for YAMAHA YFB 250 TIMBERWOLF 2WD, YFM 350 BIG BEAR 4WD, YFM 400 KODIAK 4WD 1993-1996. The regulator rectifier is the link between the alternator and the battery. With the engine running, the alternator (stator and flywheel) produces an alternating current whose voltage rises with the revs.

Why replace the regulator?

The benefits:

• The battery charges again as you ride and starting becomes reliable again.
• A stable voltage protects the bulbs, the ignition unit and the fuel-injection electronics.
• MOSFET versions run cooler: a longer-lasting regulator on machines with little airflow.

Why choose ELECTROSPORT?

ElectroSport has supplied stators, regulator/rectifiers and CDI ignitions for dirt bikes, road bikes and ATVs since 1998, and makes all its components in its own factory in California, giving it control over manufacturing and testing.

When should you replace this part?

A battery that goes flat despite regular riding, bulbs that keep blowing, lights that vary with revs or a connector browned by heat: check the regulator.

Specifications and fitting tips

• Manufactured to handle higher power loads
• Developed in the USA
• Manufacturer part number: ESR644

Cross-Mania tip: Clean the connectors and the earth point, mount the regulator somewhere with airflow and its fins clear, then measure the voltage at the battery terminals with the engine running to confirm it is charging.

Compatibility

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

Fits:
YAMAHA YFB 250 TIMBERWOLF 2WD 1996
YAMAHA YFB 250 TIMBERWOLF 2WD 1995
YAMAHA YFB 250 TIMBERWOLF 2WD 1994
YAMAHA YFM 350 BIG BEAR 4WD 1996
YAMAHA YFM 350 BIG BEAR 4WD 1995
YAMAHA YFM 400 KODIAK 4WD 1995
YAMAHA YFM 400 KODIAK 4WD 1994
YAMAHA YFM 400 KODIAK 4WD 1993