Author Topic: Micro Carburation issues...  (Read 1182 times)

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Offline sharkey

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Re: Micro Carburation issues...
« on: November 27, 2016, 03:29:27 am »
Because both the H and L circuits of the carb feed from the same metering chamber, the barometric pressure of the metering chamber must be kept below atmospheric barometric pressure or the fuel stops flowing.  The high speed nozzle which is fed by the H circuit, has a check valve contained somewhere in its system to prevent atmospheric barometric pressure from seeping past its check valve and back into the metering chamber.  Some of these valves are screens that are wetted by fuel, and others are of a mechanical check valve style.  The mechanical check valve style nozzle has been more problematic than the screen type.  All of the screen type systems are serviceable, but the mechanical check valve types are not.  The reason is some of the components are not sold by the carb manufacturer.  I guess they want you to buy a new carb?  Navigate over to Walbro's website and look up the carb.  The parts listing will show which components are used.  Before I bought any carbs or parts though I would go with what Eccentric posted and replace the seals and all of the fuel line.                   
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