Better fuel atomization means more efficient use of fuel , meaning more power. When your reed valve is damaged or worn out, the air-fuel mixture can not stay in the crankcase when under pressure on the down-stroke. This will result in less fuel entering the cylinder , causing power loss, and backflow into the carburetor, causing numerous problems.
Learn how your 2-stroke carburetor works here. Many manufacturers offer reed valve upgrades. The list is too long for this video, but if you want to go shopping, you can always find a great deal through Amazon! If you have any questions or anything to add, please leave them in the comments or on our FaceBook page! Carbon fiber based, 0. Offered sheets have high durability, optimum fiber to reinforcement ratio and narrow thickness tolerance range.
High temperature epoxy resin system we use has catalogue temperature capability of degC degF. We use full heat treat cure cycle to ensure the best parameters. All our carbon reeds are intensely tested, including testing by Polish trial and motocross competitors. These are also successfully used on daily basis by hundreds of customers. Based on this cumulative experience and feedback being received we are certain about quality and performance of our product!
CompoTec xmm 3. We are looking forward to cooperation with distributors, shops, two stroke engine service shops as well as individual customers. We can also develop a material adjusted to particular needs or requirements. Reed valve in a two stroke engine — what it is and how it works? Source of all the graphics above: Wikipedia article Reed valve design is simple see Pic.
The bigger the engine, the thicker reeds should be used. Too thin reeds are susceptible to premature damage. For engines above ccm we suggest using 0. Reed petals can be cut manually using i. After cutting smoothly blend all edges with i. All reed valve petals wear away and have limited life. High temperature epoxy resin system — catalog capability up to degC.
The idle speed and low speed jet cannot be adjusted properly, the engine may not idle at all without throttle , start easily, nor reach full output. The engine may also "spit" at the carburetor and drip fuel excessively.
If the petals break off, the engine may not run or start, depending on how much of the petals is missing. Polini, for example, recommends that pilots replace the petals every hours. However, do not assume that if you have an engine that will not idle or has an erratic idle that the reed valve needs service. The usual cause of that the carburetor needs a rebuild. One ingenious mechanic figured out a way to test for major failure of the reed valves without removing them from the engine.
A little more difficult way to check the valve requires removing the carburetor and then look into the reed valve body with a flashlight. It will be pretty obvious if you have a problem. Be certain your reed valve body does NOT leak. Here is a video of leaking reed valve body. A gas leak detection fluid was applied to the area where the valve contacted the engine. Even though the screws which fastened the valve body to the engine had been tightened correctly, the valve body face and the crankcase face were not quite flat.
The variation was greater than a dry gasket could seal. The fix: Apply RTV to both sides of the gasket. Most paramotor engines e. These engines will not experience fuel pump failure if the reed valve body leaks. Top 80, newer Moster 's Some engines have a reed valve body with a special passageway or port that goes from the crankcase to the carburetor and then to the fuel pump diaphragm. This port transmits the pulses from the crankcase that operate the fuel pump.
The port must not be obstructed with sealant or debris and must be air tight and not leak. If the reed valve body is loose and the port is leaking, the fuel pump will not work well. I have found loose reed valve bodies on both brand new and used Top 80 engines.
A new engine may run fine for a number of hours and then the screws that attach the reed valve body to the crankcase begin to loosen because they were not torqued properly at the factory nor was threadlock applied to keep them from loosening.
As things loosen, the fuel pump does not work as well and the pilot may notice "hiccups", especially near or at full throttle. When the problem gets severe, the engine will quit when the throttle is fully opened. Nonetheless, the engine may run OK at idle and at lower RPM because there is enough suction present in the carburetor throat to overcome a weak or failed fuel pump. It is important to note that there are other things that can also cause fuel starvation. The pump cannot work unless the strong pressure impulses that exist in the crankcase get adequately transmitted to the pump.
Such things as sealant in the reed valve body passageway, a defective or incorrectly oriented gasket, or a leak can prevent the pulses from reaching the pump. This carb-to-reed valve gasket was so misaligned that it completely covered the pulse port on the reed valve body. The actual port is just below the hole in the gasket red arrow.
0コメント