VM28 - really a pumper?

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01 Feb 2012 12:44 - 01 Feb 2012 12:44 #501303 by notaduc
VM28 - really a pumper? was created by notaduc
I am confused at folks calling these pumper carbs.

My understanding is that an accelerator pump is internal to each carb that squirts a bit of fuel in when you crack the throttle at low rpm to make up for the loss of vacuum (more or less).

It looks to me like the 28 and 29 smoothbores have a single external vacuum fuel pump, not a system like the RS mikunis (for example).

Could someone correct or confirm some or all of this?

1980 (mostly) KZ1000
Last edit: 01 Feb 2012 12:44 by notaduc.

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01 Feb 2012 13:14 #501310 by roy-b-boy-b
Replied by roy-b-boy-b on topic VM28 - really a pumper?
They were installed so the manfacture could lean the slow jet to pass emission standards. I have owned 28 and 26 pumpers. I don't know if they madea 24. Roy

1979 LTD Street Fighter.1977 KZ1000

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  • DoubleDub
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01 Feb 2012 15:29 #501342 by DoubleDub
Replied by DoubleDub on topic VM28 - really a pumper?
No eBay APP ID and/or Cert ID defined in Kunena configurationThe later VM28's had accelerator pumps (the ones that came on Kz1000's). The Z1 models did not.



Part of the accelerator pump can be seen on the bottom of the #2 carb on that one. There is also a rod going from that piece to the throttle mechanism which activates the accelerator pump.

Your understanding of how they operate is my understanding of how they operate.

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01 Feb 2012 18:04 #501377 by mtbspeedfreak
Replied by mtbspeedfreak on topic VM28 - really a pumper?
On today's E10 gas, would you get any performance benefit from an accelerator pump?

2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!

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  • DoubleDub
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01 Feb 2012 18:11 #501378 by DoubleDub
Replied by DoubleDub on topic VM28 - really a pumper?

roy-b-boy-b wrote: They were installed so the manfacture could lean the slow jet to pass emission standards. I have owned 28 and 26 pumpers. I don't know if they madea 24. Roy


The 24's on my '79 Kz650-C3 are pumpers, so yep.

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