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Buell Forum » Old School Buell » Archive through April 04, 2016 » Accelerator pump linkage « Previous Next »

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Valguard
Posted on Saturday, February 06, 2016 - 03:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:







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651lance
Posted on Saturday, February 06, 2016 - 07:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

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:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

They also help for starting especially if the bike sits any length of time.
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