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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide carburation
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<blockquote data-quote="ernie" data-source="post: 16853" data-attributes="member: 63"><p>Oh dear, JTAN is down.</p><p></p><p>So here is another carburettor question. </p><p></p><p>I am the founder of the "Tilt your stub mounted 276 carburettor in order to adjust the fuel level in the float bowl" club, which Tom Gaynor has recently joined. For years I enjoyed a sooty rear spark-plug and fuel consumption of 40 mpg. I tilted the carb on the stub lowering the float bowl about a gnat's testicle. Result - not quite so sooty a rear plug and fuel consumption of 55 mpg. </p><p></p><p>All carb settings are standard for a standard B Rapide. Front plug is nicely brown with no tilting.</p><p></p><p>So now a few questions:</p><p></p><p>1 Who else has resorted to this tweak to adjust fuel level?</p><p></p><p>2 Are there different lengths of float needle to effect the adjustment? Or are there different float bowls? All the ones I have look the same.</p><p></p><p>3 Is the cause of the rising fuel level wear on the needle?</p><p></p><p>4 In my box of assorted carb bits I found 3 different shouldered nuts which screw onto the bottom of the carb body (see my picture). The middle is the one usually found on our carbs. The longer one on the left would also effect a lowering of the fuel level in the carburettor. Has anyone fitted such a one?</p><p></p><p>Final question to check if Graham reads my post - is the spelling checker running mine or yours?</p><p></p><p>Best regards</p><p></p><p>Ernie</p></blockquote><p></p>
[QUOTE="ernie, post: 16853, member: 63"] Oh dear, JTAN is down. So here is another carburettor question. I am the founder of the "Tilt your stub mounted 276 carburettor in order to adjust the fuel level in the float bowl" club, which Tom Gaynor has recently joined. For years I enjoyed a sooty rear spark-plug and fuel consumption of 40 mpg. I tilted the carb on the stub lowering the float bowl about a gnat's testicle. Result - not quite so sooty a rear plug and fuel consumption of 55 mpg. All carb settings are standard for a standard B Rapide. Front plug is nicely brown with no tilting. So now a few questions: 1 Who else has resorted to this tweak to adjust fuel level? 2 Are there different lengths of float needle to effect the adjustment? Or are there different float bowls? All the ones I have look the same. 3 Is the cause of the rising fuel level wear on the needle? 4 In my box of assorted carb bits I found 3 different shouldered nuts which screw onto the bottom of the carb body (see my picture). The middle is the one usually found on our carbs. The longer one on the left would also effect a lowering of the fuel level in the carburettor. Has anyone fitted such a one? Final question to check if Graham reads my post - is the spelling checker running mine or yours? Best regards Ernie [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rapide carburation
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