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Motocross Shop > Dirt Bike Parts > Engine Parts > Performance Parts

	Merge Racing Adjustable Leak Jet/Accelorator Pump Cover FCR * A modern four stroke off-road motorcycle is designed to run at its best, at an air to fuel ratio of 13:1 to 14:1 depending upon a few variable factors, including the type of fuel, altitude and humidity * When the mixture gets out of this range it can cause a noticeable loss of power, poor starting, damage to internal components, and it can cause the engine to overheat * When the throttle of an internal combustion engine is opened rapidly the engine quickly sucks in a large volume of air through the intake. Unfortunately, the large FCR MX carburettors lose velocity when opened very fast, and relies on an accelerator pump to compensate, this small pump literally sprays a small jet of fuel into the engine to richen the mixture to an acceptable level. If the amount of fuel isn't increased to match the volume of the air, the bike can hesitate, or bog * The best way is to combat bog, is to accurately regulate the jetting and then adjust the accelerator pump to match the air flow * The most accurate way to adjust the accelerator pump is to install this highly accurate kit, the leak jet will be replaced with an adjustable leak circuit so you can get the engine dialled in perfectly no matter where you are. See Merge Racing Introduction to their Accelorator Pump Cover here. See Merge Racing Installing Video to their Accelorator Pump Cover here. See Merge Racing Installation PDF to their Accelorator Pump Cover here. Price: £99.98 (Including: VAT at 17.5%)
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	Merge Racing FCR Fuel Mixture Screw The fuel mixture screw in your bike is critical and its adjustment should be done every time you ride. The Merge FMS has a unique T shape to it that always allows the rider to have positive action on the fuel screw. Even with gloves on! Superior product for the same price Brass material to increase life span Quality injection molded knob for easy adjustments Improved fit for better resistance to backing out due to vibration Supplied with spring, O-ring and washer so you dont have to worry about losing the stock ones! Price: £14.99 (Including: VAT at 17.5%)
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	Merge Racing FCR Hex-Head Stainless Bolt Kit * Made from high quality stainless steel * Hex-Head provides easy, positive installation and removal * Replaces poor quality OEM cross-head screws FCR Stainless Steel Allen Bolt Set for FCR float bowl and diaphragm cover Price: £4.99 (Including: VAT at 17.5%)
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	Merge Racing FCR Accelorator Pump Spring The APS eliminates any wiring tricks that are out there and increases pressure on the pump diaphragm due to its being 50% stiffer then the stock ones. Direct replacement for OEM spring Improved throttle response Excellent companion to the ALJ giving you greater range of adjustment No need for any wiring on the accelerator pump Allows use of longer diaphragms See Merge Racing Installation PDF to their APS here. Price: £14.99 (Including: VAT at 17.5%)
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	Boyesen QuickShot Accelerator Pump Cover - No Hesitation! No Bogging! No Problem! With more than 30 years in High Performance engineering and manufacturing, Boyesen has produced an all new accelerator pump cover to solve the bogging problem associated with 4-stroke Keihin FCR carburetors. Fits: CRF/CRFX 250/450 2002-2006 KXF/RMZ250 2004-2005 RMZ450 2005 KTM 250/400/450/525 4 stroke FCR carbs ONLY YZF250/426/450 00-05 If your bike is not listed please contact us. Click here to see larger image of the Boyesen QuickShot & full details Price: £60.00 (Including: VAT at 17.5%)
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	Boyesen Rad Valve - RELEASE HIDDEN POWER IN YOUR BIKE The RAD or Radical Air Design Valve is a radical new concept in reed cage design. The RAD valve is Flow-Bench designed, to insure not only maximum air flow at the top RPM but also maximum air speed at all engine speeds. The benefit to the racer is more blast out of corners, and higher revs down the straights. Dyno tests have yielded up to 3HP increase in power on a 250 motocross machine. All RAD valves come complete with the renowned Boyesen Dual Stage Rad Valve Reeds, and a rubber manifold as shown. 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. Price: £149.99 (Including: VAT at 17.5%)
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Motocross Shop > Dirt Bike Parts > Engine Parts > Performance Parts

RPA MX Ltd is committed to bringing you the best products, with the best details and images, at the best prices possible. If you have found a similar product elsewhere at a cheaper price please let us know and we will try to match that price, whilst still giving you the service you would expect from us.
Although we always try to keep images, product information and prices upto date, in the ever-developing world of motocross it is inevitable that, from time to time, there may be slight differences from the images and details shown to the actual products supplied.