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Accelerator pump

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15 Aug 2022 03:10 #872267 by Missile2511
Accelerator pump was created by Missile2511
Hello all. My number two carb always runs rich even though I give it an extra half turn of air compared to the other three. I was wondering if the proximity of the accelerator pump to number two causes number two to be over fed by the accel pump.
Does anyone on this forum have similar issues and does anyone here ever set the needle on two at a leaner setting than the other three carbs to try and compensate for the position of the pump. I have all of the needles set in the number 3 slot right now and I was thinking about setting number two by 1/2 -1 slots leaner.
thoughts,
Joe

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  • hardrockminer
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15 Aug 2022 05:38 #872276 by hardrockminer
Replied by hardrockminer on topic Accelerator pump
The pump is designed to provide a small squirt of gas when you crack the throttle.  It is likely not your problem.  I would look for other issues.  Choke plunger leaking a bit?  Float valve set a bit high?  

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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  • gd4now
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  • Denco where did you go?
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15 Aug 2022 08:31 #872286 by gd4now
Replied by gd4now on topic Accelerator pump
I agree that if the pump is working correctly it should not be causing the issue you have.  But it might be helpful to learn which set of carbs you have, as there are some differences between how the pumps and the vacuum port for the petcock locations are different between them.

1977 KZ650 B1
Pods and Denco header


OLD KAW OWNERS SMILE ALOT

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15 Aug 2022 12:59 #872299 by Missile2511
Replied by Missile2511 on topic Accelerator pump
Thanks for your insight, I will check the float level and choke plunger.  If the choke plunger is leaking, would that create a rich or lean condition?
Joe

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15 Aug 2022 13:04 #872300 by Missile2511
Replied by Missile2511 on topic Accelerator pump
Thanks for your input. All I know about the type of carbs is what the manual tells me; Mikuni VM 24SS.

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15 Aug 2022 13:35 #872303 by Missile2511
Replied by Missile2511 on topic Accelerator pump
I have not replaced the choke plungers and suspect they are original. I will make that my next project. THANKS!
Joe

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  • gd4now
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15 Aug 2022 13:44 #872304 by gd4now
Replied by gd4now on topic Accelerator pump
OK, on the vm24ss carbs the location of the vacuum port for the petcock on on carb #2 while the vm26 or vm28 carbs have the port on carb #3. I am not saying this is the issue but if the diaphragm in the petcock has a tear then fuel can be pulled up into carb #2 on the vm24ss carbs which would make it richer.

1977 KZ650 B1
Pods and Denco header


OLD KAW OWNERS SMILE ALOT

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15 Aug 2022 13:49 #872306 by Missile2511
Replied by Missile2511 on topic Accelerator pump
Thanks again, the petcock is brand new and does not leak at all with the fuel supply line to the engine removed in either the run or reserve positions.

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  • hardrockminer
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15 Aug 2022 17:39 #872314 by hardrockminer
Replied by hardrockminer on topic Accelerator pump
A leaking choke plunger will make your mixture richer.

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
The following user(s) said Thank You: Missile2511

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23 Aug 2022 10:48 #872699 by Missile2511
Replied by Missile2511 on topic Accelerator pump
I pulled the carbs and cleaned up the starter plungers and replaced all of the o-rings. That made a big difference and the low end is much improved. Not perfect yet, but we are definitely moving in the right direction. Thanks to all for your input.
Joe

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