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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series "A" Twin front carb float level
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<blockquote data-quote="greg brillus" data-source="post: 87835" data-attributes="member: 597"><p>It is somewhat difficult to understand how exactly these horizontal carburetors function, as the mainjet is dead center of the mixing chamber, so if the float level is bellow it, to me it might starve of fuel, whereas if the level is up with the hole in the jet, then what stops fuel continuously flowing through it and ultimately straight down the inlet port and flood the cylinder. My thoughts are that the float level should be somewhere near the center of the jet , but with the carb body slightly tilted so the bowl end is down just a touch......Enough to not let fuel run, but simply rely on the suction from the main venturi to draw fuel from. I set the front carb up in this way this afternoon, and the bike started and ran well. Whilst I had the jet block out I also ran a number 76 drill through the idle circuit passageway just to be sure of good fuel delivery at low engine speed like I do on all the new Shadow carb's and this makes the low speed tuning much better. I also did this to the rear carb as well, and checked the float level in the normal way with a fitting in the banjo bolt and a piece of clear tube. The level for the rear carb is tricky too as the rear one angles slightly upward, so the level needs to be about 3 mm bellow the center top of the large lower brass cap nut, or else fuel will dribble from the small hole where the locator peg for the jet block locates. Sorry for all this useless dribble..................</p></blockquote><p></p>
[QUOTE="greg brillus, post: 87835, member: 597"] It is somewhat difficult to understand how exactly these horizontal carburetors function, as the mainjet is dead center of the mixing chamber, so if the float level is bellow it, to me it might starve of fuel, whereas if the level is up with the hole in the jet, then what stops fuel continuously flowing through it and ultimately straight down the inlet port and flood the cylinder. My thoughts are that the float level should be somewhere near the center of the jet , but with the carb body slightly tilted so the bowl end is down just a touch......Enough to not let fuel run, but simply rely on the suction from the main venturi to draw fuel from. I set the front carb up in this way this afternoon, and the bike started and ran well. Whilst I had the jet block out I also ran a number 76 drill through the idle circuit passageway just to be sure of good fuel delivery at low engine speed like I do on all the new Shadow carb's and this makes the low speed tuning much better. I also did this to the rear carb as well, and checked the float level in the normal way with a fitting in the banjo bolt and a piece of clear tube. The level for the rear carb is tricky too as the rear one angles slightly upward, so the level needs to be about 3 mm bellow the center top of the large lower brass cap nut, or else fuel will dribble from the small hole where the locator peg for the jet block locates. Sorry for all this useless dribble.................. [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Series "A" Twin front carb float level
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