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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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accelerator pump, check valve, cv carb

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Old 8th February 2021
T_worth T_worth is offline
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Default installing accelerator pump check valve and nozzle

I recently picked up a CV carb (27490-96A) for my 97 xl1200s. I'm disassembling it for a good long soak in the bath. I wanted to dig deep and check the shape of the accelerator pump check valve, so I pulled the nozzle out and the valve dropped right out. Valve and nozzle look in good shape.

Is there a way to properly install the valve? When I reassembled it, you can hear the check valve move up and down when gently flipping the float bowl over. Is this amount of movement normal? Or Should it be in a fixed-pressed position?

Should the valve be sitting on the half round ledge of the accelerator nozzle or arranged butt end to butt end?

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Old 9th February 2021
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Here's the Sportstpedia section regarding the CV40 Carb accelerator pump:
http://sportsterpedia.com/doku.php/t...uel_float_bowl

The check valve & nozzle are not a service item in the FSM, so little information is provided.

You might measure the nozzle cavity & determine whether there is sufficient room below the bottom of the nozzle (when in place) for the check valve to move freely up and down. If so, then matching cut-to-cut may be irrelevant. However, if there is little clearance for the check valve to operate beneath the level of the nozzle, then matching cut-to-cut may be essential.

Please post your measurements and experience so we can all learn from that.

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