![]() ![]() If the pop-pressure is higher than 22 psi, rebuild the carburetor. Pop-off pressure 1.3-1.4 Bar (19-21 psi) rest pressure > 0.68 Bar (10 psi) minimum Metering lever spring length: 13.3mm Pilots should not modify these springs! ![]() Engine manufacturers e.g., Vittorazi may modify the carburetors on their engines.Īlways check the user manual of your engine for the correct needle jet settings which may be different than those specified by Walbro.įor part location, name, and part number see the WB diagram below. These specifications for the WB are stock. This is because unburned fuel in a two stroke helps cool the engineĪnd why they must run rich. The high speed jet on a two stroke engine is adjustedīased on engine running temperature, not maximum engine speed. Overheats and then they blame the engine manufacturer. The fact that too many pilots lack basic mechanical skills and experiment with the high speed jet, leaning it out too much. Some engine manufacturers tamper-proof the main needle jet by putting a seal on it so that it cannot be changed. If gasoline with ethanol is being used, all bets are off and maintenance intervals will be shorter.Īlcohol ages carburetor guts and fuel lines quickly compared to 100% gasoline. If you watch your CHT often while youįly, it is probably OK to rebuild the carburetor "as needed". Pilots canĬhoose to rebuild based on performance but they will run the risk of overheating their engine. Sign that the carburetor needs a rebuild is that the idle becomes erratic or idle adjustment becomes difficult or impossible. However, if the fuel system is thoroughly purged, these parts will last much longer. Remember that the flexible neoprene parts of the carburetor age whether Muchĭepends on the gasoline used per how often a rebuild is necessary. Rebuild the carburetor if it has been more than a year or after (25) hours of operation, whichever is sooner. To say the least, it is unwise to fly without a CHT installed.įollow this link for general notes on Walbro carburetors concerning design, inherent problems, fixes, and ![]() Generally, if you do not have a CHT (cylinder head temperature gauge), do not change the high speed adjustment from the factoryĭefaults more than 1/8th turn either direction. Be EXTREMELY careful adjusting the high speed system and always follow your paramotor Rather than a fixed high speed jet like the WG, the WB carburetors have an adjustable high speed needle jet. The port transfers the pulses from the engineĬrankcase to the fuel pump diaphragm inside the carburetors. The WB and MPE090 carburetors are identical except that the WB has an external pulse port and the MPE090 has an internal pulse port. ![]()
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