Boyesen 640 Power Reeds

(No ratings yet)

Key item features

Boyesen's patented dual-stage design incorporates a specially shaped top reed and a ported bottom reed
The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs. The stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs
More Air Flow. The dual-stage design allows you to replace your stock reed stop with a Rev-Plate which permits the reeds to open freely and function efficiently
More Air Velocity. The multi-port feature of the bottom reed creates more channels for the charge, delivering increased velocity to the intake ports
More Overall Power. Dual-stage reeds work in unison to perform efficiently throughout the entire powerband. The difference in stiffness between the top reed and the bottom reed allow the reeds to respond quickly and accurately to changes in engine pressure. This translates into quicker acceleration, crisper throttle response and increased horsepower throughout the powerband
The price shown is for one set of reeds. Please check your vehicle whether you need one or two sets of reeds.
Quicker acceleration for that all-important holeshot
Crisper throttle response for fast corner exits and surer jumps
More horsepower throughout the powerband for guaranteed performance
Improved engine efficiency and fuel economy for the long distance rider
Longer life - Boyesen Power Reeds outlast all other aftermarket reed petals
NOTE: Certain models need to use the stock metal stops when installing the new reeds

Specs

Manufacturer part number
640
Vehicle model
YZ250, IT490, YZ490, IT250, IT400, IT425, IT465, YZ400, YZ465
Vehicle make
Yamaha
Vehicle fitment type
Specific
Brand
Boyesen
Automotive specialty part type
Fuel & Air

Current price is $37.95

Price when purchased online

Free shipping
Free 30-day returns

How do you want your item?

Ships to

Arrives between Jul 2 - Jul 8

Sold and shipped by OEMcycles

4.511450381679389 stars out of 5, based on 393 seller reviews(4.5)

Free 30-day returns

Other sellers

$46.20

+Free shipping

Shipping, arrives by Wed, Jul 1 to Columbus, 43215

Sold and shipped by 4WheelOnline

Free 30-day returns

About this item

Product details

Boyesen Power Reeds use a patented dual-stage fiberglass design for more airflow, more air velocity and more overall power. This item fits the following applications: 1978-1989 Yamaha YZ250, 1983-1984 Yamaha IT490, 1982-1983 Yamaha YZ490, 1977-1983 Yamaha

Boyesen's patented dual-stage design incorporates a specially shaped top reed and a ported bottom reed
The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs. The stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs
More Air Flow. The dual-stage design allows you to replace your stock reed stop with a Rev-Plate which permits the reeds to open freely and function efficiently
More Air Velocity. The multi-port feature of the bottom reed creates more channels for the charge, delivering increased velocity to the intake ports
More Overall Power. Dual-stage reeds work in unison to perform efficiently throughout the entire powerband. The difference in stiffness between the top reed and the bottom reed allow the reeds to respond quickly and accurately to changes in engine pressure. This translates into quicker acceleration, crisper throttle response and increased horsepower throughout the powerband
The price shown is for one set of reeds. Please check your vehicle whether you need one or two sets of reeds.
Quicker acceleration for that all-important holeshot
Crisper throttle response for fast corner exits and surer jumps
More horsepower throughout the powerband for guaranteed performance
Improved engine efficiency and fuel economy for the long distance rider
Longer life - Boyesen Power Reeds outlast all other aftermarket reed petals
NOTE: Certain models need to use the stock metal stops when installing the new reeds

info:

We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.

Specifications

Manufacturer part number

640

Vehicle model

YZ250, IT490, YZ490, IT250, IT400, IT425, IT465, YZ400, YZ465

Vehicle make

Yamaha

Vehicle fitment type

Specific

Warranty

Warranty information

One year manufacturer's warranty against defects in materials and workmanship under normal use for a period of ONE (1) YEAR from the date of retail purchase by the original end-user purchaser (“Warranty Period”). Warranty does not cover wear and tear or extraordinary damaged caused by the consumer. Warranty is direct from manufacturer. Any questions or claims are to be made directly with the manufacturer.

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.