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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1952 Comet Carburettor New Float Level.
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<blockquote data-quote="greg brillus" data-source="post: 47708" data-attributes="member: 597"><p>Hi Matty, Your method of checking the float level is fine but the clear tube should be held next to and along side the idle mixture screw where the level should be at or slightly bellow the base of the mixture screw thread. The float level will have a large effect on the running as the higher the level the easier it is for the fuel to be drawn in and burnt as a rich mixture. The level you find can be adjusted by shimming the float on its needle with small washers if necessary. The slide needles are different from the 276 and 229/289 carb's as the 276's needles are shorter, so this will affect your mixture as well....i would think running a 289 needle in a 276 carb would make it run lean.....your issues may stem from one problem trying to compensate another, hence the odd running and plug colour. These carburretor setting are quite sensitive, even a worn needle jet (usually a 106) will make it run rich as well.....if you replace the needle jet, and use the correct slide needle...and set the float level to the right height, your engine will be much happier. Perhaps buy your Amal parts from someone who knows what the parts are before they send them........A never ending problem......Cheers and good luck......Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 47708, member: 597"] Hi Matty, Your method of checking the float level is fine but the clear tube should be held next to and along side the idle mixture screw where the level should be at or slightly bellow the base of the mixture screw thread. The float level will have a large effect on the running as the higher the level the easier it is for the fuel to be drawn in and burnt as a rich mixture. The level you find can be adjusted by shimming the float on its needle with small washers if necessary. The slide needles are different from the 276 and 229/289 carb's as the 276's needles are shorter, so this will affect your mixture as well....i would think running a 289 needle in a 276 carb would make it run lean.....your issues may stem from one problem trying to compensate another, hence the odd running and plug colour. These carburretor setting are quite sensitive, even a worn needle jet (usually a 106) will make it run rich as well.....if you replace the needle jet, and use the correct slide needle...and set the float level to the right height, your engine will be much happier. Perhaps buy your Amal parts from someone who knows what the parts are before they send them........A never ending problem......Cheers and good luck......Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1952 Comet Carburettor New Float Level.
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