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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
740 carb review also known as DFT DFTA weber
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<blockquote data-quote="dan filipi" data-source="post: 145442" data-attributes="member: 54"><p>No load up coasting down hill IS a big deal.</p><p></p><p>Joe and I have chatted for many hours getting a good understanding of this dft carb.</p><p>Many mods have been tried to lean out the idle, this latest one seems to be getting there if it isn't already.</p><p></p><p>I'm posting a picture with some explanation of what Joe is talking about.</p><p>I may have more to add to this but this is the jist of it....</p><p></p><p><img src="https://classicgoldwings.com/forum/gallery/image.php?album_id=10082&image_id=26230" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Idle mixture screw #44 (in blue) was removed from the dft carb by some stupid EPA requirement for the car it was used on.</p><p>This screw metered both fuel and air (emulsified gas/air mix) into the passage which leads to the lower mix screw #40.</p><p>The raw gas from the idle jet next to the top air bleed #36 (in red) gets air added by the #36 air bleed to the raw gas as well as the other red circled arrow below.</p><p></p><p>What Joe has done is modified a simple set screw to meter the fuel/air mix at #44 to cut the flow speed/volume going down through the rest of the circuit as well as drilled the top air bleed #36 larger to allow more air into the mix at it's starting point at the top of the carb.</p></blockquote><p></p>
[QUOTE="dan filipi, post: 145442, member: 54"] No load up coasting down hill IS a big deal. Joe and I have chatted for many hours getting a good understanding of this dft carb. Many mods have been tried to lean out the idle, this latest one seems to be getting there if it isn't already. I'm posting a picture with some explanation of what Joe is talking about. I may have more to add to this but this is the jist of it.... [img]https://classicgoldwings.com/forum/gallery/image.php?album_id=10082&image_id=26230[/img] Idle mixture screw #44 (in blue) was removed from the dft carb by some stupid EPA requirement for the car it was used on. This screw metered both fuel and air (emulsified gas/air mix) into the passage which leads to the lower mix screw #40. The raw gas from the idle jet next to the top air bleed #36 (in red) gets air added by the #36 air bleed to the raw gas as well as the other red circled arrow below. What Joe has done is modified a simple set screw to meter the fuel/air mix at #44 to cut the flow speed/volume going down through the rest of the circuit as well as drilled the top air bleed #36 larger to allow more air into the mix at it's starting point at the top of the carb. [/QUOTE]
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
740 carb review also known as DFT DFTA weber
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