





photos are representational: Accuracy is ensured by Part Numbers.
A POWERFUL SOLUTION TO A SIMPLE PROBLEM
Designed for 2004 polaris 800 Switchback, this Boyesen component is built to support dependable fitment, durability, and reliable performance for serious riders.
One reed petal is NOT enough! The reed petals in all 2 stroke engines take an incredible amount of abuse! At peak RPM, reed petals are opening and closing hundreds of times per second. Over time, a single reed loses its ability to regulate flow rates in proper proportions. This causes a loss of reed petal reaction and reduces the consistency of peak horsepower. Boyesen's revolutionary dual-stage reed design delivers more usable power than stock. Stock single-stage reeds operate most effectively within a relatively narrow RPM range and are limited because of the single stage design. Boyesen's one soft reed on top of one firm flow-through reed gives you a wide range of intake control, plus increased intake velocity. Your original reeds can't possibly duplicate that performance. 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. The multi-port feature of the bottom reed creates more channels for the charge, delivering increased velocity to the intake ports and generating 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 BOYESEN POWER REED ADVANTAGE
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.


MS PLUS FLOW OPTIMIZATION
The patented multi-stage design incorporates a specially shaped top reed petal and a ported bottom reed petal. The top petal is lightweight and resilient for crisp throttle response at partial throttle or low RPM. The stiffer, bottom petal is ported to provide maximum flow and horsepower at higher RPM. By using a multiple reed petal stack, it is possible to acheive peak horsepower, more torque, improved stall resistance and greater overall reed durability.
FREE REVING POWER
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. This results in a free reving, yet extremely smooth power delivery with an improved connection between your hand, the rear wheel and the terrain.part number cross reference
| boyesen part number | serial number (start) | serial number (end) | UPC number | eu hts number | Southern number |
|---|---|---|---|---|---|
| RG163A | 804429504138 | ||||
| parts unlimited | parts europe | tucker rocky | wpc | apico int | |
| bihr | dist 1 | dist 2 | dist 3 | dist 4 | |
Applications
| Machine type | make | model | year range | cc | FUEL SYSTEM | CYLINDERS |
|---|---|---|---|---|---|---|
| SNOWMOBILE | polaris | 500 Classic | 2003-2003 | 500 | ||
| SNOWMOBILE | polaris | 500 Edge | 2003-2004 | 500 | ||
| SNOWMOBILE | polaris | 500 Indy | 1999-2002 | 500 | ||
| SNOWMOBILE | polaris | 500 RMK | 1997-2002 | 500 | ||
| SNOWMOBILE | polaris | 500 SKS Euro | 2000-2002 | 500 | ||
| SNOWMOBILE | polaris | 500 XC | 1999-2003 | 500 | ||
| SNOWMOBILE | polaris | 500 XC SP | 1999-2007 | 500 | ||
| SNOWMOBILE | polaris | 600 Classic | 2001-2006 | 600 | ||
| SNOWMOBILE | polaris | 600 Edge Touring | 2005-2006 | 500 | ||
| SNOWMOBILE | polaris | 600 Pro X | 2001-2004 | 600 | ||
| SNOWMOBILE | polaris | 600 RMK | 1998-2005 | 600 | ||
| SNOWMOBILE | polaris | 600 Switchback | 2004-2005 | 600 | ||
| SNOWMOBILE | polaris | 600 Touring | 2000-2000 | 600 | ||
| SNOWMOBILE | polaris | 600 XC SP | 1996-2004 | 600 | ||
| SNOWMOBILE | polaris | 600 XCR | 1996-1998 | 600 | ||
| SNOWMOBILE | polaris | 700 Classic | 2001-2004 | 500 | ||
| SNOWMOBILE | polaris | 700 Edge RMK | 2003-2003 | 700 | ||
| SNOWMOBILE | polaris | 700 EV XC SP Edge | 2001-2001 | 700 | ||
| SNOWMOBILE | polaris | 700 Pro X | 2003-2004 | 700 | ||
| SNOWMOBILE | polaris | 700 RMK | 1997-2005 | 700 | ||
| SNOWMOBILE | polaris | 700 SKS | 1997-2003 | 700 | ||
| SNOWMOBILE | polaris | 700 Switchback | 2004-2004 | 700 | ||
| SNOWMOBILE | polaris | 700 XC | 1997-2005 | 700 | ||
| SNOWMOBILE | polaris | 700 XCR | 1998-1999 | 700 | ||
| SNOWMOBILE | polaris | 800 Classic | 2003-2004 | 800 | ||
| SNOWMOBILE | polaris | 800 Edge Touring | 2005-2005 | 800 | ||
| SNOWMOBILE | polaris | 800 LE | 2001-2001 | 800 | ||
| SNOWMOBILE | polaris | 800 Pro X | 2003-2004 | 800 | ||
| SNOWMOBILE | polaris | 800 Pro XR | 2004-2004 | 800 | ||
| SNOWMOBILE | polaris | 800 RMK | 2000-2005 | 800 | ||
| SNOWMOBILE | polaris | 800 SKS | 2003-2003 | 800 | ||
| SNOWMOBILE | polaris | 800 Switchback | 2004-2005 | 800 | ||
| SNOWMOBILE | polaris | 800 XC | 2001-2005 | 800 | ||
| SNOWMOBILE | polaris | 800 XCR | 1999-2003 | 800 |
extended fitment
Polaris 800 RMK 00-05, Polaris 800 Pro X 03-04, Polaris 800 Classic 03-04, Polaris 700 XCR 98-99, Polaris 700 XC 97-05, Polaris 700 Switchback 04, Polaris 700 SKS 97-03, Polaris 700 RMK 97-05, Polaris 700 Pro X 03-04, Polaris 700 EV XC SP Edge 01, Polaris 700 Edge RMK 03, Polaris 700 Classic 01-04, Polaris 600 XCR 96-98, Polaris 600 XC SP 96-04, Polaris 600 Touring 00, Polaris 600 Switchback 04-05, Polaris 600 RMK 98-05, Polaris 600 Pro X 01-04, Polaris 600 Edge Touring 05-06, Polaris 600 Classic 01-06, Polaris 500 XC SP 99-07, Polaris 500 XC 99-03, Polaris 500 SKS Euro 00-02, Polaris 500 RMK 97-02, Polaris 500 Indy 99-02, Polaris 500 Edge 03-04, Polaris 500 Classic 03, Polaris 800 Pro XR 04, Polaris 800 Edge Touring 05, Polaris 800 LE 01, Polaris 800 XCR 99-03, Polaris 800 XC 01-05, Polaris 800 Switchback 04-05, Polaris 800 SKS 03,




