Walbro Carburetor Service

For the complete line of Walbro small engine maintenance and repair products, visit:

[frankie]

This presentation is the best, Repeat best, Explanation and illustration of how a diaphragm carburetor works and is designed. Walbro is a first class company.

[unfundedopportunities]

From ZAMA carburetor website: Pop-off pressure:
"A lot of emphasis has been placed on carburetor pop-off pressures when in reality they are not
an important issue to the service professional. In fact checking pop-off pressure can often
damage the carburetor by stretching the fuel pump diaphragm and breaking the seal of the fuel
pump gasket. Rather than pressurizing the carburetor to pop-off, Zama recommends that the
carburetor should be pressurized at the fuel fitting to 10 p.s.i. It should hold this pressure for a
minimum of 15 seconds."

[Krispy]

Lou and Don - this is a great video - I learned much from it, thanks for presenting it in a very professional and easy to understand format.

[momatomic]

Louie and Don, Well done! My boyfriend and I had to get that boggy old Ryobi gas weed trimmer going, and after watching your video, we learned a lot, especially about fuel delivery.   It runs fine, as my sore arm will attest,  the lawn is done- and now maybe we can figure out the carb problem on the high-wheel weed trimmer.

[KasunFernando]

Mind the purge bulb cover direction.
Note that the sleeve is away from the fuel inlet: 16:23
After disassembling, it is assembled incorrectly: 18:52

[packrat]

9:14 that metering lever adjustment is a pain in the butt to get it just right.  Thanks for posting this video with this info.

[steadyeddie]

I was excited when I saw your 57-11 pressure tester. Then I looked it up and saw the $158.00 price. Wow! But thanks for the informative video. And for everyone out there, as another commenter said- primer bulbs dont prime, they purge. You can press them 100 times and you will not flood the carb. They only purge the carb of air. Cheers.

[fulviocenati]

Video veramente bello, parlo solo in Italiano o un poco in Francese quindi non capisco le spiegazioni, ma le immagini sono chiarissimo. Professionalità, Serietà, Precisione, Qualità.
Congratulazioni, Ottimo!

[peppe.]

Molte grazie, dopo vari tentativi di ripristino falliti, ho risolto il problema rimuovendo il tappo gallese e pulendo il piccolo pozzetto sottostante.

[jamesdoyle]

No mention of the purpose of two throats on the WYA carburetor, and the lack of any adjustment screws whatsoever. 
Excellent video.   I attended a training class for Stihl products when  I worked for a dealership and your video covers a lot of the same material.

[sunnysacto]

Walbro makes excellent small engine Carbs. My 2006 Echo CS 330T has always run perfect, but past few times, it started acting like running out of fuel, Now it will not start. New Walbro carb kit fix is on the way

[jackagain]

I've re-built these a few times, it really works. The carbs are damaged by ethanol, even if you use a stabilizer. Note: Only use marine grade Stabil. The red stuff isn't good enough. It's mostly the metering diaphragm that goes bad and causes your engine not to start.

[larryncfc]

Thanks very much walbro team very handy step by step showing gasket and Diaphram replacement.

[popswrench]

been playing with these carbs for near 40 yrs . good vid .

[rayinsouthcarolina]

Thanks for a great video guys. I do have a concern about the tamper resistant section though. If all the carburetors you guys produce operated at the same air temperature and same elevation above the same mean sea level @ a specific barometric pressure you would not have an H/L adjustment on your product. In my real world it simply ain't so. I have had to make adjustments on the fly just to get through the day on mountain side harvesting. I know what we really need to do is keep congress out of the engineering department. If you don’t believe it just look what happened to our gas cans!!!
Thanks
Ray n S.C.

[Lulanda]

It drives me crazy when people always call the purge bulb a primer on 2 cycle equipment! All it does is confuses people who don’t actually know how these fuel management systems work now days. The (purge bulb/bubble) is not actually a primer bulb as they used to be years ago on equipment. You do still see a lot of 4 cycle equipment with actual primer bulbs that literally squirt fuel into the intake when actuated, however the carburetors in this video and on most of today’s modern 2 cycle equipment is actually a Purge bulb meaning it has 2 lines going to the fuel tank one feeding it, one a return. When you press the bulb it just circulates the fuel though the carburetor ridding any air that might be trapped in the lines or the carb. I used to work on small engines on a mass production level and you would not believe the amount of units I had come in with no start as the complaint and all it would be was the owner operator thought if they actually pushed the bulb more than once or twice they would flood the engine! If you don’t use it the purge bulb the equipment is hard to start. 😂 I wish we could all just stick to calling it a purge bulb and explain the simple fact that it’s not like a carb on a car that you can flood the engine with. You can press the bulb till your pink in the face and it won’t flood anything 😆

[andybecker]

Very informative video. A lot of people mistakenly call the air purge bulb a “primer bulb”. Some older lawn mowers and snow blowers did have an actual primer bulb that forced fuel into the throat of the carb.In this application though it just pulls fuel from the tank, circulates it through the carb, then returns it to the tank to eliminate air from the system to ease starting. Generally, if there is also a choke lever it is an air purge not a primer.

[franklinkopecky]

take a dremel with a small cutting wheel and with a steady hand cut some slots for a pocket screwdriver... depending on the location of adjustments you can cut into the carb body with no ill effects...

[e.h.lipton]

Congratulations, you've just succeeded in sending me too a foreign manufacturer for anything that runs on gas!

[yongminhuh]

You are the right person to ask about carburetors. What are the differences between 2 cycle and 4 cycle carburetors? Only differences I see is the spring in 4 cycle carburetor fuel pump side which 2 cycle carburetor doesn't have. Why is there a spring? Now a day, there are no adjustments valves, all factory set. It see to me that the spring in fuel pump side diaphragms causes, flooding in carburetors and wet sparkplugs, difficulty in starting. I have a 26.5cc 4 cycle weedwacker(brand new). I can't get it to start no matter what I tried. I have other 4 cycle lawn equipments with fuel pump diaphragms and spring. They all have bigger engines about 200cc. I don't have any problem with them. Please, let me know! Thanx.