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Fuel Fuel Delivery

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June 20th, 2017, 06:40 PM   #31
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Thanks gents.

On closer inspection, the holes aren't tapped, nor is there a penetration in the diaphragm cavity.

This being a Racing Replica spec model, I guess it came without the smog / deceleration kit.

Case closed. Thanks to you both.

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June 21st, 2017, 12:20 AM   #32
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On the Keihin two additional valves/pumps could be installed.
  1. Fuel acceleration pump
  2. Air-cut valve

The old Dellorto comes with or without fuel acceleration pump, but doesn't have an air-cut valve option.

The Fuel acceleration pump should avoid "hick-ups" when accelerating. On the Dellorto, when accelerating, the throttle slide moves up, it actuates a lever which presses on the diaphragm pump which pumps gasoline into the venturi/main barrel. When releasing the throttle slide a spring pushes the diaphragm/membrane in it's initial position, via another one-way valve gasoline is sucked into the pump again, ready for the next time accelerating. On the Keihin that pump is attached to the float bowl and actuated by an external lever.

The air-cut valve should prevent popping in the exhaust during deceleration. The diaphragm blocks the air bleed system of the low speed circuit partially and therefore enriches the mixture. It's actuated by vacuum during deceleration.
Attached Thumbnails
FCR 41 carb-dellorto-phm-40-ms1-without-fuel-pump-001.jpg   FCR 41 carb-dellorto-phm-38-bd1-fuel-pump-001.jpg   FCR 41 carb-keihin-fcr-41-fuel-pump-001.jpg   FCR 41 carb-keihin-39-fcr-mx-air-cut-valve.jpg  
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June 25th, 2017, 11:54 AM   #33
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Found out today that the hot start an choke aren't interchangeable! One has a rubber seal on the end the other doesn't.

So stupid question. Does the choke plunger have a catch to hold it out? If not how the hell you start it??

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June 26th, 2017, 12:04 AM   #34
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your choke button has lost it's "guts". best get a new one. we hold them and so do Allens.


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June 28th, 2017, 10:32 AM   #35
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So it should have a latch like the dell?

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