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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series ‘A’ Twin Carburetion
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<blockquote data-quote="greg brillus" data-source="post: 107160" data-attributes="member: 597"><p>Hi there Bill, yes the new carb's on the new bikes have all had that mod done. Rodney brought his bike down Yesterday and it was running quite rough and only on the rear cylinder this on a hot engine. Before he had shut the engine off, I quickly reached under the tank and depressed the tickler. The engine then ran on both cylinders quite happily again..........So I raised the float level twice and now the engine runs fine and on both cylinders. I made up a visual aid (tool) using an old lower banjo bolt and drilled a 5/16" hole in it's center, this enabled me to rig up another 289 carby horizontally in the bench vice. I then attached the float bowl using the modified banjo bolt and filled the bowl with fuel, then you can see the actual level of fuel. If the tickler is depressed the level rises quickly and the fuel dribbles through the hole in the carby jet block where the needle jet would normally screw in. I would say I have raised the level by 4 to 5 mm in height. It is enough that the tickler plunger needs a few mm shaved off it's length or else it will hold the bowl down and cause the bowl to flood continuously. I don't believe the original brass bowls have as low a fuel level as the later mazac bowls, but this really depends on the needle/float combination used..........As there is little to no information about this horizontal set up of these carb's, it has to be done by trial and error. Once the engine rev's come up, I feel the air/fuel flow through the carby is enough to overcome this low speed running issue, thank goodness, as otherwise it could have done some damage. So hopefully this will be sorted out and the engines will be more the happier for it. Cheers............ Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 107160, member: 597"] Hi there Bill, yes the new carb's on the new bikes have all had that mod done. Rodney brought his bike down Yesterday and it was running quite rough and only on the rear cylinder this on a hot engine. Before he had shut the engine off, I quickly reached under the tank and depressed the tickler. The engine then ran on both cylinders quite happily again..........So I raised the float level twice and now the engine runs fine and on both cylinders. I made up a visual aid (tool) using an old lower banjo bolt and drilled a 5/16" hole in it's center, this enabled me to rig up another 289 carby horizontally in the bench vice. I then attached the float bowl using the modified banjo bolt and filled the bowl with fuel, then you can see the actual level of fuel. If the tickler is depressed the level rises quickly and the fuel dribbles through the hole in the carby jet block where the needle jet would normally screw in. I would say I have raised the level by 4 to 5 mm in height. It is enough that the tickler plunger needs a few mm shaved off it's length or else it will hold the bowl down and cause the bowl to flood continuously. I don't believe the original brass bowls have as low a fuel level as the later mazac bowls, but this really depends on the needle/float combination used..........As there is little to no information about this horizontal set up of these carb's, it has to be done by trial and error. Once the engine rev's come up, I feel the air/fuel flow through the carby is enough to overcome this low speed running issue, thank goodness, as otherwise it could have done some damage. So hopefully this will be sorted out and the engines will be more the happier for it. Cheers............ Greg. [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series ‘A’ Twin Carburetion
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