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How to remove the brass plug and the accelerator pump from a walbro carb

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Posted on Jan 02, 2017

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SOURCE: Snapper SS312 weed eater. Cranks when primed but won't run

I am sorry to say this, but the compression for that type of engine should be atleast 120 psi. Remove the muffler and look at the cylinder, it is scarred beyond repair.

Posted on Apr 22, 2009

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SOURCE: Walbro Carburetor on Briggs & Stratton Model 28R707

If the float don't float, the needle valve stays open and gas runs into crankcase.

If float floats (has no gas inside) then the needlel is probably worn and needs replacement.

Posted on Sep 30, 2009

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SOURCE: What is the correct spark gap on a NGK BPM7A spark plug ?

Hi Patrick:
.035 " is a "standard" gap that should work fine for you.

Posted on May 06, 2016

Testimonial: "thank you !!"

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SOURCE: I have a 42' poulan riding mower w/ a 14.5 B&S engine, it has a Walbro carb...needing to replace the carb thats on it, I found that the Engine offered two different manufacturers of carbs?

i think walbro is a better carb. nikki is ok but just dont like them. it should be ok. why dont you just put a rebuild kit in the one you have? that is only $10.00 or $12.00

Posted on Jun 19, 2016

Testimonial: "when originally checking the haste?....I stripped-out the top of the nozzle-jet along w/ the threads where it screws up into? Costly mistake! I've tried buying a new jet only to find out the threads it screws into where too *******-up for it to set properly? I know....what a dummy! thanks though?"

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Stalling/popping while riding, takes tons of gas to get it to engage in first. Problems continue in second gear. It idles fine and starts right up. Bike is a 2002 Sportster XL883, but it has been upgraded...

It sounds like the accelerator pump has gone bad on you. Take the air filter off and with the engine OFF, crank the throttle to wide open. Watch the brass nozzle just inside the mouth of the carb for a sqirt of gas. If you don't see the shot of gas going into the carb, youe accelerator pump diaphragm needs to be replaced. This will require that the float bowl, and possibly the entire carb, be removed from the engine. Take the small accelerator pump cover off the bottom of the float bowl and change the diaphragm. This would be my best guess.

Good Luck

Jun 24, 2011 | 2002 Harley Davidson XL 1200 C Sportster...

1 Answer

98 HD Road King carb. Bogs out at 60km Stalls at idle

Not a lot of information to work from but my best guess is a bad accelerator pump diaphragm. If it coughs back through the carb when you try to accelerate at 60Km or stalls when you try to rev the engine at idle, this would be my first guess. Of course, there are other things as well but let's start here.

Remove the air filter cover and the air filter. With the engine OFF, crank the throttle wide open while watching the brass nozzle in the mouth of the carb. You should see it squirt fuel into the carb. If it does not, then your diaphragm in the accelerator pump is bad or there is trash plugging the hole it charges through in the bottom of the float bowl. You can purchase the diaphragm at your local H-D dealer for about $15 U.S., part number 27361-76A To replace the diaphragm, remove the float bowl from the carb, turn it upside down and take out the remaining two screws and replace the diaphragm just like the old one came out. There is a lip on the edge of the diaphragm. Make sure you install the new one with the lip in the proper direction.

Good Luck

May 13, 2011 | Harley Davidson FLHR-FLHRI Road king...

1 Answer

My 2000 roadking classic at an idle runs great but wen i give it throttle it bogs right down like its gonna die but doesnt

If the engine is equipped with a carburetor, it sounds like the accelerator pump is not working. Take your air filter off and with the engine OFF, crank the throttle wide open. You should see a squirt of fuel squirt into the carb from the brass thing in the mouth of the carb. If not, the accelerator pump is not working. It probably needs a new diaphragm in it.

To put a new diaphragm in the carb, remove the air filter backing plate and take the four screws out that holds the float bowl on. With the float bowl off the carb, turn it upside down. Take out the remaining two screws in the accelerator pump plate. You'll see the diaphragm and the return spring under the plate. Put the new diaphragm on position with the sping on top and reinstall the plate. Put the float bowl back on the carb and reinstall the air cleaner backing plate. Make sure the throttle works as it should and start the engine. It should rev cleanly now.

Good Luck

Apr 30, 2011 | Harley Davidson FLHRCI Road King Classic...

1 Answer

While checking out the problem i was having with my super S&S type E carb, two small ball bearings dropped out. I kind of suspect where they go, but am not quite sure. can you help?

They go in the accelerator pump. There is also a very small spring that goes into one of the holes. These are the "check valves" for the accelerator pump. You can download a drawing at S&S site. Go to this site and download instruction sheet # 51-1012 for Super "E" and "G" carbs. There will be two small balls and one of them will have a small spring. It goes in the hole closest to the brass drain plug.

Good Luck

Mar 10, 2011 | Harley Davidson FXSTD Softail Duece...

1 Answer

I have a 2005 ultra classic 113 ci when you accelerate quickly it bogs down like a loss of power what are some of the things i can check

If your engine is equipped with a carburetor, check the accelerator pump. Remove the air cleaner cover and the air filter. With the engine OFF and the petcock on, crank the throttle to the wide open position. Watch the small brass thing just inside the mouth of the carb as you do this. You should see it squirt a stream of fuel into the carb. If not, you need to rebuild the accelerator pump in the carb.

If it's fuel injected, you'll have to take it to a dealer.

Good luck

Aug 28, 2010 | 2005 Harley Davidson FLHTC - FLHTCI...

1 Answer

The carburator is making explosions every time that I give it gas

By explosions, I'm going to assume that you're talking about the engine is spitting back out the carburator when you try to accelerate. This is usually caused by either a stopped up jet or a bad accelerator pump. More likely the later.

To check the accelerator pump for proper operation, Remove the air cleaner cover and the air filter element so you can see into the throat of the carb. Now, with the engine OFF and the fuel turned on, crank the throttle grip to wide open. When you do this, you should see a stream of gasoline squirt into the carb out of a brass piece just inside of the throat of the carb. It will quit then you stop turning the throttle. Then you'll have to back the throttle off and turn it again to get it to squirt again. If it does not squirt, the accelerator is bad.

To fix the accelerator pump, it is best to remove the float bowl from the bottom of the carb. Turn off the fuel at the petcock. Take the four bolts that hold the float bowl on out and lower the float bowl. Pour the fuel out of the bowl and turn it completely over. Take the two remaining screws out of the accelerator pump and remove the cover. Under the cover is a spring and a diaphragm. The diaphragm should be replaced, and pay particular attention to what way it goes in. One side has a ridge on it. This ridge goes into the groove around the accelerator pump housing in the float bowl. Before assembling the accelerator pump, check the passages in the float bowl for obstructions. Put the new diaphragm in with the spring and install the cover with the two screws.

Now, replace the float bowl on the bottom of the carb making sure you align the accelerator pump push rod with it's passageway. Slide the float bowl all the way up to the bottom of the carb body and install the four screws. This should repair your accelerator pump.

If the pump is not the problem, you could have either a stopped up jet or a punctured slide diaphragm. To repair either of these requires the removal and complete disassembly of the carb. good Luck

Apr 12, 2010 | 2002 Harley Davidson XLH Sportster 883...

1 Answer

My 2000 XL1200C has started backfiring and kills the engine. How can I remedy this problem?

If your bike is carburetor equipped, I'd suspect that you have a jet in the carburetor that is stopped up or the accelerator pump on your carb is not working correctly.

To check the accelerator pump, remove the air cleaner cover and the air cleaner element. Wtth the bike NOT running. Look into the carburetor and crank the throttle wide open. You should see a stream of gasoline come out of the small brass piece and squirt into the carb in a continous stream from time you start opening the throttle until you get wide open. If you do not see this, you need to remove the float bowl and clean it out and replace the diaphragm in the accelerator pump on the float bowl.

Apr 07, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Fuel line leaking where it goes into carbarator

If your carb is the original Keihen CV type carb, there is an angle fitting going into the carb. This fitting is made of plastic and brass. The brass part is pressed into the carb but the plastic cracks as it gets old. This may be where your fuel leak is originating. This is difficult to repair but it can be repaired. V-Twin sells the replacement fittings. The carb must be removed from the engine to replace this part. The cost of the part is about five dollars U.S.. The labor may cost you a bundle depending on where you take the bike. I do them here in my modest shop. It doesn't take any "special" tools.

Another place that these carbs will leak fuel is the accelerator pump. If your bike stumbles when you take off from a stop light or stop sign, you may have a bad diaphragm in your accelerator pump. If you remove your air filter housing and backing plate, you'll see short rod on the right hand side of the carb going into a small plate on the bottom of the carb. This is the accelerator pump. It has three screws that holds the plate on, one long screw and two short ones. If you see fuel coming up from around the hole the rod goes into, your diaghragm has a hole in it and your need replace it. This job can be done without removing the carb from the engine but it is easier to take the carb off. Again, part is relatively inexpensive but labor is a biggie.

Any service manual will tell you how to replace the accelerator pump diaphragm but they won't tell you how to replace the fuel inlet fitting. If you need help with that, write me directly and I'll tell you how to fix either one. Good Luck!

Dec 24, 2009 | 2004 Harley Davidson FLHTCUI Electra Glide...

3 Answers

Replacing fuel tank on craftsman edger and other fuel not understand where to hook fuel lines back up?  any diagrams?

ok If you have a Walbro WT series carb "without" a built on primer bulb here it is. First off if the fuel lines disintegrated you MUST disassemble it and clean it out. The MOST infintesimle speck of gas line trapped, can allow good prime and bad operation. OK? Don't be lazy on this. Just be delicate removing the flaps gasket and diaphram. ZAMA GND-12 Is the replacement Gasket and diaphram kit fot that carb. Use a cleaner, compressed air or blow good thru it. OK Now...Primer bulb, Carb, and Fuel tank, re connects: Smaller Diameter line comes from Gas tank (Connect filter screen to this in tank) to the short Straight brass carb connector. Primer bulb suction goes to the bent carb brass connector. If small line brings fuel "in" this other line sucks it back "Thru the primer bulb" and the blow side of the primer bulb sends it back to the fuel tank! So...Small Line brings fuel "TO/IN" carb thru short brass connect on carb. Other carb connect goes to bulb suction "IN", Then primer bulb "Pressure OUT" goes thru the larger tube "back to fuel tank". Trust me I know how frustrating a simple diagram is to find online fo this set up. And if you have a carb problem on top of the hook up uncertainty you got frustration. Not only was online help hard to find (Mfg...etc NFG at all!) My local repairshop in BBrook NJ could not tell me how!!! and thats no lie! Walbro has a "generic" carb diagram but no "hook up info" specifically. Poulan don't list it either. And these things routinly fall to pcs. all 3 of mine crumpled together on yr. 3 of use.

Jun 15, 2009 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

Snapper SS312 weed eater. Cranks when primed but won't run

I am sorry to say this, but the compression for that type of engine should be atleast 120 psi. Remove the muffler and look at the cylinder, it is scarred beyond repair.

Mar 30, 2009 | Garden

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