Author Topic: Accelerator pump driving me crazy. (Read 13884 times)

Ira · « **Reply #25 on:** July 02, 2012, 08:39:22 PM »

Lucky and TwoTired, you guys are true scholars.

Here's a picture of the ears when I took the pump apart:

And here's the ears after running a few small drill bits through by hand:

And this is the difference in volume:

Accel pumps after cleaning gasket passages.

Again, thanks Ken for the suggestion to bench test these. My check valve stops are metal, not plastic, so i'm glad they seem to work.

Spanner 1 · « **Reply #26 on:** July 02, 2012, 08:45:43 PM »

Corn gas dunnit to Micky Mouse

... that left hand 'ear hole' sits in gas 24/7, the r/h one only gets the 'squirt' gas thru' it....

Ira · « **Reply #27 on:** July 02, 2012, 08:53:38 PM »

You called it as well! Once again, this forum is the best. So helpful.

lostmykeys · « **Reply #28 on:** July 02, 2012, 09:01:04 PM »

Wow,mine dont squirt with that much force.
I should be taking notes from you!

lucky · « **Reply #29 on:** July 02, 2012, 11:48:11 PM »

HAhhahhhahahahahhaha Now that is the test!!! Through the other side!!1 HHahhahhaha

lucky · « **Reply #30 on:** July 02, 2012, 11:59:46 PM »

Quote from: flybox1 on July 02, 2012, 08:06:07 PM

Those tiny restrictors dissapeared with one of my POs long ago.
My Diaphragm looked soft, orings seal, check valves spray nicely...my system seems to function as it should, but now I can't help but wonder if a fresher diaphragm would help move things along.
Does anyone have specs on the restrictors? It might be worthwhile to find some brass hobby tubing and fab some. I'll try it.

I will get you those measurements tomorrow Flybox1.

TwoTired · « **Reply #31 on:** July 03, 2012, 02:20:14 AM »

Quote from: Ira on July 02, 2012, 08:39:22 PM

And this is the difference in volume:

Accel pumps after cleaning gasket passages.

That's about what I recall on my bench, too. They squirt about 8 inches from the nozzle equally on all four when working at proper capacity and the lines are fully primed. That outflow check valve is what holds the prime.

Cheers,

flybox1 · « **Reply #32 on:** July 03, 2012, 07:30:09 AM »

HAHAHA, yep mine squirt straight through, too

As I recall, #4 had the least amount of "squirt". The restrictors just might remedy this.
Thanks for hunting down the specs on these, Lucky.
ALSO....need to know if it was in ALL the tubes between bowls, or just specific ones. thx.

fb1

lostmykeys · « **Reply #33 on:** July 03, 2012, 10:26:26 AM »

flybox,
I just realised your second video was with the carbs off the bike.
I did the same thing and got the same results as I was pushing down the diaphagm rod manualy.
When I put the carbs back on the bike the squirt was not as strong as it only went just past the slides.

flybox1 · « **Reply #34 on:** July 03, 2012, 10:33:49 AM »

you can thank Ira for those videos.

yes, manual actuation of the accel pump will get you a longer squirt.
this is where the restrictors come into play... hoping Lucky shows with the specs so i can order brass tubing before EOB today. i'll repost on this thread with the results and make up a few sets if members have the need.

lucky · « **Reply #35 on:** July 03, 2012, 11:11:28 AM »

These are the measurements of the brass tubes inside that rbber tube between accelerator pump nozzle feed lines

Two tubes between all three connections. The reason is that by having two parts it allows you to fit the fuel tube in between the carbs in that tight spot.
Three tubes .350 inches long. Slightly less than 3/8 inch.
Three tubes .450 inches long. 1/16 inch less than 1/2 inch.

One long tube and one short tube between each of the three connections.

The outside diameter of the tubes is 1.87 O.D. or 3/16 inch
The inside diameter of the tube is is 1/8 inch.

It might be possible to use fuel tubing (plastic) from a model airplane hobby shop?

Ira · « **Reply #36 on:** July 03, 2012, 11:20:07 AM »

Quote from: lostmykeys on July 03, 2012, 10:26:26 AM

flybox,
I just realised your second video was with the carbs off the bike.
I did the same thing and got the same results as I was pushing down the diaphagm rod manualy.
When I put the carbs back on the bike the squirt was not as strong as it only went just past the slides.

I actually was doing the same thing(manually actuating the carb) in both videos- both on and off the bike. My throttle cable was broken.

flybox1 · « **Reply #37 on:** July 03, 2012, 11:27:29 AM »

Quote from: lucky on July 03, 2012, 11:11:28 AM

These are the measurements of the brass tubes inside that rbber tube between accelerator pump nozzle feed lines

Two tubes between all three connections. The reason is that by having two parts it allows you to fit the fuel tube in between the carbs in that tight spot.
Three tubes .350 inches long. Slightly less than 3/8 inch.
Three tubes .450 inches long. 1/16 inch less than 1/2 inch.

One long tube and one short tube between each of the three connections.

The outside diameter of the tubes is 1.87 O.D. or 3/16 inch
The inside diameter of the tube is is 1/8 inch.

It might be possible to use fuel tubing (plastic) from a model airplane hobby shop?

Got it!
thanks

lostmykeys · « **Reply #38 on:** July 03, 2012, 02:29:00 PM »

Ira,let us know how far they squirt when you get the carbs back on the bike when using the throttle.
Thanks

Ira · « **Reply #39 on:** July 03, 2012, 02:44:55 PM »

Sure thing. I just got a new throttle cable in the mail. I'm post a video when it's hooked up.

lostmykeys · « **Reply #40 on:** July 03, 2012, 03:53:44 PM »

Ira sounds good,
Just dont be dissapointed if the squirt is not as strong when everything is in place like I was.
With the engine running the vacume will pull that fuel stream in.

Ira · « **Reply #41 on:** July 03, 2012, 10:11:39 PM »

Accel pump carbs mounted w/ new throttle cable.

That's what I got. My carbs must have been in really bad shape, because after all of this cleaning and troubleshooting, the bike PULLS. I'd gotten used to less power, and now I'm back from a test ride with a huge smile on my face.

scunny · « **Reply #42 on:** July 04, 2012, 12:53:56 AM »

that's a good squirt. going too have a wee peek at mine.

lucky · « **Reply #43 on:** July 04, 2012, 02:32:18 PM »

Now that this accelerator pump issue is taken care of I want to know if this bike still has good throttle response from idle.

1975 engine.
1977 carbs.
Kerker 4 into 1.
Stock air box with K&N filter.
"My carbs are jetted w/ #120 main and # 35 idle, pilot at 1 1/2 turns."

I still do not see how this bike accelerate smoothly from idle with #35 idle jets.
Maybe it does because it is a 1975 engine and 1977 carbs but only IRA can tell us if it hesitates or bogs from idle.

Does it?

I think it will need #42 idle jets.

TwoTired · « **Reply #44 on:** July 04, 2012, 03:48:21 PM »

Quote from: lucky on July 04, 2012, 02:32:18 PM

I still do not see how this bike accelerate smoothly from idle with #35 idle jets.

That is precisely why the PD carbs HAVE accelerator pumps.

Quote from: lucky on July 04, 2012, 02:32:18 PM

I think it will need #42 idle jets.

Not with an accelerator pump that is working properly.

Ira · « **Reply #45 on:** July 04, 2012, 10:05:33 PM »

I'm still getting a feel for the difference in acceleration. The power kicks in earlier, like 2k rpm vs. 3, but I feel like there's a bit of hesitation? I'll really have to ride a little more tomorrow to describe it. Thanks for helping me dial this thing in, it's making a big difference.

Ira · « **Reply #46 on:** July 05, 2012, 08:00:51 AM »

If I do end up needing larger idle jets, does anyone have a line on them?

These guys are out of stock: http://www.siriusconinc.com/pro-detail.php?pid=&product_id=1109

flybox1 · « **Reply #47 on:** July 05, 2012, 11:11:40 AM »

Foggy-headed morning project....

12" x 3/16" (1/8" ID) brass tubing was $2 at local hobby store.
3@ .350"
3@ .450"
deburred and cleaned up.

lucky · « **Reply #48 on:** July 05, 2012, 12:09:46 PM »

Quote from: Ira on July 05, 2012, 08:00:51 AM

If I do end up needing larger idle jets, does anyone have a line on them?

These guys are out of stock: http://www.siriusconinc.com/pro-detail.php?pid=&product_id=1109

You can get the push in style idle jets from Sirius Consolidated.
Just find the ad on Ebay for jets being sold by Sirius Consolidated and go down to the bottom of the page and click on "ask a question" that will lead you to a box to ask them. They answer their mail very quickly.

I know from personal experience the #42 idle jet will fix the problem. I tried a #40 and it still did not work good enough.

When I set up a motorcycle I expect NO hesitation at all at any time.
Some people say it does not hesitate or bog but they baby the throttle to get the response to be smooth by rolling on the throttle slowly.

lucky · « **Reply #49 on:** July 05, 2012, 12:17:41 PM »

Accelerator pumps.

Men like these.

STORY...
I was a sculptors assistant for a few years after I got out of graduate school.
One of the experiences I learned from was that when someone wanted a fountain with a sculpture in it and water, that the man and the woman would come to look at the sculpture with water running on it.

The husband always wanted the water to shoot up high. (no surprise)
The wife wanted the water to flow smoothly low and quiet over the sculpture.

People do not generally know this but when you have a fountain with water, it can splash and make a big mess so certain things are added to the water to get the molecules to stick together and make less splashing around the fountain area. The higher the water the bigger the problems.

So yes....men like accelerator pumps! LOl..lol,HAhahhhaha

Even if they cause problems.

News:

Author Topic: Accelerator pump driving me crazy. (Read 13884 times)