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TOPIC: Accelerator pump 1981 kz650

Accelerator pump 1981 kz650 17 Feb 2019 05:32 #798798

  • Rockybalboba
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Ok so bear with me a bit here, tearing down these carbs to clean them all up and found this, which I found out to be the accelerator pump, the square part with rubber, but this triangle shaped spot has threaded holes, but there was nothing there... am I missing something?

Also, these are vm26 carbs correct?
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Accelerator pump 1981 kz650 17 Feb 2019 05:58 #798800

  • martin_csr
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The triangular vacuum sensor wasn't used on the 81 KZ650-CSR, so it wasn't machined at the factory to accept the sensor diaphragm & didn't come with the triangular cover. That puzzled me also as the K&L kit includes the sensor diaphragm.

The carburetors on the 81 650-CSR are VM24s. The engine side measures around 26 mm, but inside the bore near the throttle slides is 24mm.


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Accelerator pump 1981 kz650 17 Feb 2019 06:00 #798801

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Ok, I had notice there wasnt any holes under that except the threaded screw holes, so I will ignore that, awesome!

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Accelerator pump 1981 kz650 17 Feb 2019 06:11 #798802

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Other accelerator pump stuff. Each carb bowl should have a ball, weight (rod) & clip and each of the pump nozzles on the carb bodies should have an o-ring. I used o-rings from a HF metric nitrile o-ring kit.

Edit: you should test the pump to make sure the fuel squirts straight thru the carb bores without hitting the walls.

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Last edit: by martin_csr.
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