Accelerator Pumps

[aahondaowner]

In viewing the accelerator pump shown on Whiting's site, there seems to be a discrepancy in my opinion, that the cup washer is only on one side.
A smaller surface area of pushing side of the pump would cause premature failure.
Honda had the same size of cup washer on both sides.
See attached.
The failed original pump has the full cup washer but still failed after an unknown period of use.
   Remember, "You get what you inspect not what you expect"

[dustyspath]

where do I get that part please give the site name  or link as I need  a accelerator  pump   thanks

[mmcquay555]

Bill,
I agree that the accelerator pump on Bruce's site is not identical to the original, however, what other choice to we have?  (I need one, too.)
So far, honda600carparts is the ONLY source I'm aware of for a replacement accelerator pump diaphragmn.
If you know of another source, please share.
On a related note, 16048-371-004 looks very similar to an accelerator pump.
Can anyone confirm that it will or will not work as one?
75-79 HONDA GL1000 GOLDWING NEW K&L CARBURETOR AIR CUT-OFF VALVE KIT 18-2792 | eBay
75-79 HONDA GL1000 GOLDWING NEW K&L C...
This item is : a k&l air cut-off valve kit. The item you are bidding on will fit:1975-1979 honda gl1000 goldwing. This item is a high quality alcohol resistant valv...
View on www.ebay.com
Preview by Yahoo

Note: 1 image(s) originally linked in this post are no longer available (ec).

[feltonminicycle]

An Air Cut Off Valve is not an accelerator pump, wrong material and as I recall wrong size. Here's the exact same one $20 cheaper but I wouldn't waste your time.
http://www.saber-cycle.com/store/product66.html
 I have been using Bruce's accel pump diaphrams for 20 years and never a problem. Alternately I have tested not using the accel pump and I couldn't tell a difference. I bought a bag of Nitrile orings and was going to make a cap off plate.
Miles

[mmcquay555]

That is very interesting information, Miles.
I'm going to experiment with deleting the accelerator pump and see what happens.

[Don B Laughton]

Oh, it will run.  Don't be surprised if your 0-20 times  look more like 0-60 times.  Don't put your foot in it as it will stumble badly or die completely.  But, good luck.
On Wednesday, November 23, 2016 8:30 AM, "mmcquay555@... [2cylinderhondas]" wrote:
That is very interesting information, Miles.
I'm going to experiment with deleting the accelerator pump and see what happens.

[mmcquay555]

That's exactly what I would EXPECT to happen, but that's not what Miles said he experienced.  We'll see how it goes...

[Bill]

Why would Honda make that way if they didn’t need to?

[Dr Bruce Whiting]

Bill is correct here. The need for an accelerator pump is related to how fast the throttle is opened. When the throttle opens rapidly the air flows faster than the fuel. This causes a lean condition and a cough. Motorcycles don't need an accelerator pump since their throttles are leveraged differently. They open more slowly than car thottles. You could get away with it if you never rapidly mash the throttle.
On another note. The air cut off diaphragms are not made from a material that holds up to fuel. It takes a very good material to resist destruction from todays fuel.

[dusty path]

hay bill cant u make a accelerator  pump  for this guy ? and whats wrong with the site that has one  it will not work  I will need a hole carb rebuild  kit and going to buy the kit they show   if it don't work I will just send it back   but this care will not run with out that pump I know I did try it. IT dies every time u hit the gas  at a stop light  its a real pain with out the accelerator pump I had a old Honda 600  bike that had a pump on it  it would not run at all with out it  just keep die ing   yes its is on there for a reason  it helps on start offs  from dead stops  and for passing  if u stomp  it  with out it will die  just adding my 2 cents  in
On Thursday, November 24, 2016 2:57 PM, "Dr Bruce Whiting theenginebuilder@... [2cylinderhondas]" wrote:
Bill is correct here. The need for an accelerator pump is related to how fast the throttle is opened. When the throttle opens rapidly the air flows faster than the fuel. This causes a lean condition and a cough. Motorcycles don't need an accelerator pump since their throttles are leveraged differently. They open more slowly than car thottles. You could get away with it if you never rapidly mash the throttle.
On another note. The air cut off diaphragms are not made from a material that holds up to fuel. It takes a very good material to resist destruction from todays fuel.