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Valguard
| Posted on Saturday, February 06, 2016 - 03:23 pm: |
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S1W with a CV40 carb: The throttle plate would not fully open. As in, it would not be at 180 degrees before the throttle shaft could no longer move. I concluded that the accelerator pump linkage was preventing it. So, I removed it. I know the accelerator pump is not needed, but I thought this was more of a fuel savings/practice in minimalism. I haven't seen anything about it purposefully stopping the plate movement. Is this by design? Or have a just "product improved" my carb? Here is a before and after:
![](http://www.badweatherbikers.com/buell/messages/47623/778468.jpg)
![](http://www.badweatherbikers.com/buell/messages/47623/778469.jpg)
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651lance
| Posted on Saturday, February 06, 2016 - 07:54 pm: |
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The accelerator pump shaft if installed correctly will not keep the throttle from opening all the way. When the pump quits working on a bike they will tend to have a flat spot when accelerating at the start. In all the years in the HD business we've left them in for better results. |
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Buell_bert
| Posted on Sunday, February 07, 2016 - 12:19 am: |
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I do agree with 651. Something must be amiss with the installation. I just pulled out a couple spare carbs I have as spares and none of them exhibit the problem you are experiencing. And yes they all have the acceleration pump installed. I also noticed neither pictures you show have the float bowl installed. (Message edited by Buell_Bert on February 07, 2016) |
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Valguard
| Posted on Sunday, February 07, 2016 - 01:51 am: |
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Ya, I had it all taken apart cleaning it. Hmm, perhaps it was something goofy with mine. I'm going to leave it off for now, but if I experience that flat spot I'll put it back on and figure out what was going on. |
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Harleyelf
| Posted on Sunday, February 07, 2016 - 02:42 am: |
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Watch your head temperature come summer. Too-lean running at take-off can cause damage; accelerator pumps are a vital part of the system. |
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Blks1l
| Posted on Monday, February 08, 2016 - 08:53 am: |
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They also help for starting especially if the bike sits any length of time. |
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