Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (2023)

Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (1)

Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (2)

CCMS Custom Powerheads & Reeds

Chris Carson's Marine Service

Our 1 inch Intake Spacer Plates are HERE For V6 2.0, 2.4, 2.5 135hp,150hp, 175hp, 200hp,Mercury 4,5 Petal Horizontal Applications. We also have our 1 inch Intake Spacer Plate for V6 2.4 2.5 liter Mercury 200hp, 240hp, 260hp. 280hp and 300hp Drag EFI, Horn Style Intakes and Carbureted Outboards. Our Reed Plate Setup is for 5 petal Sport Jet or 7 Petal horizontal reed applications.They are FOR SALE on our Ebay Store NOW! Visit Our Ebay Store to Buy your CCMS Reed Valves and other Performance Product! Click on the Link Below To View Our Inventory:


Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (3)Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (4)

Manufacturer of specality outboard reed valves from economy to full race, all makes and models.


Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (5)

Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (6)

Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (7)

Chris Carson Marine, Manufacturer of custom reed valves for all outboard applications. (8)

“Dear Mr. Outboard: We know what ails you, and we have the cure. ”

All gasoline engines, two strokes included, require three systems to run:


1. Induction System- mixes air and fuel and transports the mixture through critical reed valves into the cylinder for compression.

2. Compression- cylinder and crankcase compresses mixture in preparation for ignition.

3. Ignition- electrical system provides spark to ignite fuel /air mix, creating power stroke.


The proper function of the induction system of any two stroke engine relies on the integrity of the engine's internal sealing parts, orifices and surfaces. If the engine is in good shape the pistons, rings, cylinder walls and head gaskets all work to enhance cylinder compression. Crankcase seals, gaskets and reed valves are essential to properly seal and maintain the crankcase compression, proper air /fuel mixture and vacuum pulses. If all is well the only way into the crankcase is through the carburetors or throttle bodies and the critical reed valves. When the area inside the crankcase increases (pistons intake stroke) a partial vacuum is created, and air rushes in through either the carburetors or the fuel injection manifold (depending on the type engine) where it is mixed with fuel; thereafter it travels to the reed valves in the intake system. The reed valves are the one-way door for the fuel/air mix into the crankcase.

Now trapped and compressed when the piston moves back toward the crankcase, the fuel/air mix travels quickly through the intake ports in the cylinder and piston, re-charging the cylinder for the next compression and power stroke. Leakage of the mixture in and out of the crankcase from any of the sources mentioned will result in less fuel/air mix reaching the cylinders, causing power loss, increased fuel consumption, and in the case of leaky reeds, an over rich condition, especially at idle or low engine speeds. Leaky reed valves result in the engine “rebreathing” the air that has already been mixed with fuel,then regurgitated back out of leaky reeds into the intake system, and then re-inhaled and mixed with even more fuel. This results in a richer and richer mixture.

Does your engine “load up” with unburnt fuel and oil resulting in poor idle and acceleration? Does it suffer from excessive smoke and carbon buildup? Quite possibly reed leakage is to blame. Fuel injected engines suffer from leaky reeds even more than carbureted engines because the electronic control unit (ECU) injects the correct amount of fuel for a full charge of air, and has no way to recognize that air is escaping through leaky reeds, resulting in a progressively richer mixture!

The Answer

(Video) Outboard reed valves

After years of testing we consider ourselves to be experts when it comes to 2 stroke engines and reed valves, expert enough to be capable of giving good advice as to what style and type of reed valves are most suitable for your engine. And we then make and install (or provide) a better than OEM reed valve for you! We offer mono-leaf and multi-leaf designs, in different thicknesses, designed for different running parameters and different engines. All our reeds feature larger sealing areas around the leaf to prevent the ubiquitous “leaking,” and all are machine cut, not stamped (like the industry standard).A stamped or sheared reed actually begins life with frayed and delaminated edges that soon worsen to cause leakage and breakdown of the material. Our individually designed reeds do not chip at the edge, a problem that commonly leads to material delamination (inefficient sealing) and eventual reed failure. Also we use a multi-layered "space age" material far superior to the old plastic and standard reeds. All our reeds are single stage design, for good reasons…

1. Simplicity, ease of alignment.

2. Greater sealing ability

3. Lighter weight

4. Greater flexiblity

5. Less turbulence, better airflow

Simply Better!

Background for the Enthusiast

(Video) 1)- HOW TO= Tune Reed valves for MAXIMUM POWER !!!

We devote a lot of time and effort modifying engines to make them run better, faster, more efficiently, etc. You can port, relieve, polish, rod notch, finger port, etc., do all the tricks, and at the end of the day there is still only one way the fuel/air mix enters the engine. Unless your engine is supercharged, it relies on 14.7 lbs. per square inch (atmospheric or barometric) air pressure to push the reeds open. This pressure pushes air into the crankcase through the reeds to help satisfy the partial vacuum caused by the piston moving away from the crankcase into the cylinder. This expansion of the crankcase area does not create a complete vacuum, but rather only a partial vacuum, so at best there is only 6-10 lbs. per square inch pressure differential to open the reeds. But the average reed leaf is only around 1/3 of a square inch, so only about 2 to 3 lbs. of pressure is actually exerted on the vane(s) of the reed. It must open under this light pressure,but still shut instantly when the pressure ceases. At 5,500 RPM this takes place over 90 times a second!

Our state-of-the-art epoxy laminated material is more flexible and less prone to chipping than carbon fiber, 50% more flexible then metal reeds, and less than half the weight. The .020 single stage glass reeds are much more flexible at high speed than the stacked .035 thickness of material normally found in dual stage reeds, and with about half as much area to seal, (or leak).

Unlike many engine modifications, we know that with our reeds installed in your engine, it will be a win-win situation. With their greater sealing capability, light weight and flexiblity even our full race reeds idle better and are more efficient than the standard stock reeds.

Pick our reed design that best suits your application, contact us if you need our help or a recommendation.

The mono-leaf designs are primarily for fishing motors and low speed applications improving fuel economy and performance in the low and medium RPM range. The sport reeds flow smoothly, and like all fiberglass reeds, they protect the motor from internal damage should a reed ever break.The max RPM reeds are thinner and /or relieved hinge designs to allow fuel/air delivery at extreme RPMs.In our years of testing and use we have yet to experience a failure of any of our production reeds. We are currently making and stocking reeds for almost all modern engines, as well as for some stock and high performance vintage engines. We have several full race reeds available. For our clients, we can custom build reeds for your specific needs, and also offer various cage modifications as well. Included in the 1 year reed warranty is the assurance that if you break a leaf by accident, we replace it free; you won’t need to buy a complete set.

Although comparatively new to the market place in reed valve production, we have 35 years experience in modifying outboards and cutting reed valves. No longer will you need to experience a reed-related inefficient engine or rough idle. Try our reeds; you will be buying a precision product made with American materials, tooling and equipment. We are outboard performance specialists and enthusiasts, love this work, and invite you to call us (we service the SE USA) or come by and visit; we hope to be of service when it comes to any of your outboard needs.

As you can tell, we are proud to have entered the reed valve production market to offer a superior product to our customers. Try a set; we are confident you will be satisfied with our product, price and service.

Thank you & God Bless

(Video) 7)- HOW TO= Tune Reed valves for MAXIMUM POWER !!! (the end)

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