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Honda CT70 Forums
General
Carburetor screw presets?
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<blockquote data-quote="69ST" data-source="post: 174349" data-attributes="member: 5"><p>Pilot airbleed screw, 1.5 turns out from seated. Curb idle screw, look inside the venturi, turn the screw clockwise until you just see the throttle slide starting to open. Jet needle C-clip, middle groove. Those are all just initial settings, they rarely work perfectly from the get-go. Can't really dial-in a carb until the engine is up to full operating temperature & running. The optimal settings can change due to ambient air temperature, fuel formulation(s) and age. Carb castings are zinc; it's reasonably stable material but, it can oxidize over the decades depending upon the chemicals to which it is exposed and storage conditions. Usually, there's more than enough adjustment range to compensate for all of this.</p><p></p><p>If you're looking for something resembling EFI table numbers that will work...fugeddaboudit. Such an approach only works with electronic engine management. You're dealing with technology that's older than the bikes which, themselves, are currently near the half-century mark. Pretty amazing that these machines are still viable, imho.</p></blockquote><p></p>
[QUOTE="69ST, post: 174349, member: 5"] Pilot airbleed screw, 1.5 turns out from seated. Curb idle screw, look inside the venturi, turn the screw clockwise until you just see the throttle slide starting to open. Jet needle C-clip, middle groove. Those are all just initial settings, they rarely work perfectly from the get-go. Can't really dial-in a carb until the engine is up to full operating temperature & running. The optimal settings can change due to ambient air temperature, fuel formulation(s) and age. Carb castings are zinc; it's reasonably stable material but, it can oxidize over the decades depending upon the chemicals to which it is exposed and storage conditions. Usually, there's more than enough adjustment range to compensate for all of this. If you're looking for something resembling EFI table numbers that will work...fugeddaboudit. Such an approach only works with electronic engine management. You're dealing with technology that's older than the bikes which, themselves, are currently near the half-century mark. Pretty amazing that these machines are still viable, imho. [/QUOTE]
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Carburetor screw presets?
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