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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Amal Mk1 Premier Carb - Float Level
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<blockquote data-quote="Martyn Goodwin" data-source="post: 110835" data-attributes="member: 2433"><p>Found the answer myself on the Burlin Web Site. here it is</p><p></p><p>The correct fuel level for all Mark 1 Concentric carburetters is 0.21" plus or minus 0.040" below the top edge of the float bowl. Thus when the needle valve is being held shut by the tangs of the float, the level of the fuel will be between 0.17" to 0.24" (4.33mm to 6.35mm) from the top of the bowl.</p><p></p><p>The fuel level can be checked by removing the float chamber and observing fuel running into it. The fuel flow should be sufficient to hold the needle valve open, until closed by the action of the float. Insufficient fuel flow will cause the needle valve to seal under its own weight, before the float rises far enough to press the valve shut. The level of the fuel can then be measured down from the top surface of the float chamber.</p><p></p><p>The fuel level can also be checked by attaching a piece of clear tubing to the bottom of the float chamber. A plastic float chamber drain plug can be modified to mount a suitable spigot, such as an old jet, to attach the tubing. Route the tubing in a vertical position alongside the float chamber, then open the petrol tap and fill the float chamber with fuel. <strong>If the fuel level is in the correct range, the fuel will rise in the tube to a point between 0.170" and 0.240" , below the top edge of the float bowl. Start the engine and ensure the fuel level remains within the correct parameters.</strong></p><p></p><p>The new Amal 'Stay Up' float has stainless steel tangs which can be bent to alter the fuel level. The tangs can be easily adjusted, by clamping the float in a vice up to the spindle hooks and tapping the body of the float gently in the direction required until the required level is achieved.</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 110835, member: 2433"] Found the answer myself on the Burlin Web Site. here it is The correct fuel level for all Mark 1 Concentric carburetters is 0.21" plus or minus 0.040" below the top edge of the float bowl. Thus when the needle valve is being held shut by the tangs of the float, the level of the fuel will be between 0.17" to 0.24" (4.33mm to 6.35mm) from the top of the bowl. The fuel level can be checked by removing the float chamber and observing fuel running into it. The fuel flow should be sufficient to hold the needle valve open, until closed by the action of the float. Insufficient fuel flow will cause the needle valve to seal under its own weight, before the float rises far enough to press the valve shut. The level of the fuel can then be measured down from the top surface of the float chamber. The fuel level can also be checked by attaching a piece of clear tubing to the bottom of the float chamber. A plastic float chamber drain plug can be modified to mount a suitable spigot, such as an old jet, to attach the tubing. Route the tubing in a vertical position alongside the float chamber, then open the petrol tap and fill the float chamber with fuel. [B]If the fuel level is in the correct range, the fuel will rise in the tube to a point between 0.170" and 0.240" , below the top edge of the float bowl. Start the engine and ensure the fuel level remains within the correct parameters.[/B] The new Amal 'Stay Up' float has stainless steel tangs which can be bent to alter the fuel level. The tangs can be easily adjusted, by clamping the float in a vice up to the spindle hooks and tapping the body of the float gently in the direction required until the required level is achieved. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Amal Mk1 Premier Carb - Float Level
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