The Most Advanced Intake Innovations Available

Boyesen Engineering offers the most advanced intake innovations available for two-stroke engines. Their Power Reeds, Pro Series Reeds, Rad Valves and other unique products add performance and value to the motorcycle, snowmobile, watercraft and outboard marine industries. At Boyesen, R&D is hands-on, tested in the field, and tied to feedback from the end user. They use the latest computerized testing and manufacturing processes available in the industry. From research through production, Boyesen is committed to using creative concepts, new materials, and better designs that will increase your satisfaction and enjoyment in the off-road world.

If you’d like to find out more about Boyesen, check out their website here.

The Boyesen Product Range


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.

The Benefits

  • 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 reeds


The unique, carbon-fibre top reed provides superior response, allowing the reeds to respond quickly and accurately to changes in engine pressure. The fibreglass bottom reed provides durability for increased life over traditional carbon fibre reeds. Pro Series Reeds deliver the largest horsepower and torque gains any reed can offer.

The Benefits

  • Quickest acceleration any reed can offer for that all important holeshot & nbsp;
  • Crisper throttle response making challenging obstacles effortless
  • More over-rev so you can run a gear longer going into a corner or jump
  • Increased life over traditional carbon fibre reeds
  • The most potent reed available delivering power you can have confidence in


At the highest levels of trials, you have to make a lot of choices when it comes to bike setup. The clear choice of champions is Boyesen’s ultra-responsive CarbonTech Reed System. Our CarbonTech Series reed is a no-compromise reed that is designed, tested and painstakingly refined for maximal response and performance.

The Benefits

  • Quicker throttle response and acceleration
  • Easier to Ride, crisper Low RPM riding
  • Crisper, smoother transition from Low to Mid
  • Connects your hand to the power
  • Longer life – Boyesen Power Reeds outlast all other aftermarket reeds

If the application you require is not listed please call, many more applications available to special order.


Boyesen RAD Valves are the most advanced air intake system you can add to your bike!
The RAD Valve’s seamless, one-piece, precision casting and continuous aeroform surfaces ensure maximum flow velocities and instant, explosive movement of air particles the moment you turn the throttle. Integrated into the seamless inner chamber are 4-way aerodynamic directional dividers that distribute the angled charge evenly without flow loss. Each channel has its own unique Power Profile, scientifically shaped to produce instant, explosive movements of air.

Pro Series Dual-Stage Reeds come as standard on each RAD Valve. Pro Series Reeds have the superior ability to time themselves to the needs of the engine. You get maximum flow velocity across the entire RPM range, and at all throttle settings.

Each Boyesen RAD Valve is unique – tailor made to that model, year and displacement. While other aftermarket valves might change flange sizes or bolt patterns, they’re basically generic – and require you to irreversibly cut your intake boot to install it! But with the RAD Valve, there are no compromises in power, no modifications.


Add style and the Factory look to your bike with Boyesen Factory Clutch and Ignition Covers. Made from investment cast aluminium, the Factory Cover is strong, lightweight and durable, providing years of outstanding protection. Stock covers can warp due to high engine heat and pressure from the mounting screws. If this occurs, water and dirt can seep in causing corrosion of the ignition and premature wear of the crank seals. Don’t let this happen to you! Factory Covers are guaranteed not to warp and are individually surfaced for a perfect, leak-free fit.

The Benefits

  • Investment Cast Aluminium -Provides excellent heat dissipation and will not warp like stock covers
  • Powder Coated Finish – Super tough finish resists weathering and wear and tear
  • Mounting Surface- Individually surfaced for a perfect fit
  • Gasket – Asbestos-free gasket is bound with nitrile for a tight, leak-free seal
  • Outstanding Designs – Custom features include chain guards for 80cc models and a clutch cable guide that improves clutching action on the Yamaha 250
  • Mini Bike models now available!



Boyesen SuperCooler Water Pump Cover and Impeller Kits are specifically designed to enhance the performance of your engine’s cooling system. These high-flow hydrodynamic water pump kits have been tested and designed to flow more coolant. By increasing the flow, the engine will run cooler at a more constant temperature.

The Boyesen Supercooler can reduce engine temperatures by as much as ten degrees, as confirmed by tests at Team Kawasaki. How does the Supercooler achieve this? Hydrodynamics. Boyesen’s investment-cast aluminium water pump cover has bigger water inlets, a sculpted design, no casting seams, less restrictive corners, a more efficient impeller and less cavitation. Most MXA test riders feel that both the Suzuki RM-Z and Kawasaki KX-F offer marginal cooling efficiency.

The Benefits

  • Superior internal hydrodynamic shaping decreases the amount of bubbles that lessen water flow and the Nautilus-shaped cover and impeller increase pump capacity.
  • Optimized water inlet diameter gives a higher cooling capacity with its curved shape, a vast improvement on stock inlets.
  • Optimized impeller (Patented nautilus style impeller) is 25 percent more efficient at moving water than the inefficient stocker.

Limited Edition Spectra Series Waterpump kits are also available in a choice of colours on special order, as Boyesen Stocks are limited –please call the office to check availability.


Currently available for ALL kick start Keihin FCR carburetted MX, Offroad and ATV models. The patented performance of the proven QuickStart system, has an adjustable leak jet and intergrated hot start assist. A serious step towards EFI levels of performance.

This 3rd generation QuickStart combines amazing innovations that:

  • Solves tricky 4-stroke hot engine starting problems.
  • Provides an adjustable leak jet circuit for quick manual tuning.
  • Eliminate bogging and hesitation from trapped air in the system.

Electric Start models will require a separate OEM or aftermarket handlebar mounted Hot Start Lever



Available for all Keihin FCR carburetted MX,Off-road and ATV models. This patented 3rd generation Quickshot combines an innovative triple effect to completely fill the pump chamber with fuel and eliminate all trapped air from the system. This also provides an adjustable leak jet circuit for quick manual tuning. Together with the Boyesen unconditional guarantee, the QS2 simply delivers unmatched results.

The Benefits

  • Eliminates hesitation and bogging
  • Provides instant response to throttle movements
  • Reduces hot engine stalling
  • Improves low end performance
  • Bolt-on product that requires no modification



Available for all Keihin FCR carburetted MX, Off-road and ATV models. This patented 3rd generation Quickshot combines an innovative triple effect to completely fill the pump chamber with fuel and eliminate all trapped air from the system. This also provides an adjustable leak jet circuit for quick manual tuning. Together with the Boyesen unconditional guarantee, the QS3 simply delivers unmatched results.

The Benefits

  • Tuneable leak jet circuit maximizes volume of fuel and duration of fuel spray for any condition
  • Investment cast and finished to precise tolerances
  • Stops hesitation and bog
  • Instant throttle response
  • Improves low end performance
  • Fits ALL Keihin FCR carburettors
  • Simple bolt-on


This increases the horsepower and torque on 2 and 4 stroke bikes. On 2 strokes, the PowerWing improves power from idle to midrange with no loss on the top end. 4 strokes see power boosts from idle through over-rev. The PowerWing simply outperforms all other carburettor dividers on the market today.


  • Increases horsepower and torque in 2-stroke and 4-stroke engines
  • Aerodynamic design maximises velocity generation and power gain
  • Wing Channel minimizes disturbance at needle jet without affecting the jetting
  • Precision fit doesn’t reduce size of carburettor bore so there is no loss of power