Briggs and Stratton 5 hp (Model 130902) Jet Pulse carburetor problems... Any ideas?

[slomo]

It looks pretty dirty inside. Have you tried spraying some Berryman's B12 carb cleaner in it WHILE it is running to clean out some of the carbon build up around the butterfly etc.

All that would do is wash all that grit and grime into the engine straight to the rings. Better to pull the carb and clean it proper.

Tank needs to be spotless or you will have problems. As you can tell right now. You have a dirt issue.

Agree with the others, will need a carb rebuild or a new Chinese E-Pray carb. Pretty sure that carb is no longer made. Double check me on that.

 

[slomo]

Also look for a hairline crack in the long plastic fuel pick up tube. There is a fix for that if needed.

Make sure you have a new good rubber boot on the pulse line. Most are loose and will cause a poor pulse from the engine if it leaks.

You can lap the carb base and the manifold where it attaches to the block. Those are must do's.

The Briggs gasket for the manifold to the block is about 3/8" thick as in super thick. They are double the size of the Chinese carb and gaskets you can get of Scamazon or E-Pray. So if you buy a Chinese and use the block gasket, might have a vacuum leak.

 

[slomo]

OP, do everything you can to keep that old OEM carb running. Yours has an adjustable needle for the fuel mixture. New Chinese carbs do not have that screw.

 

[TobyU]

Upon closer examination of the picture I realize this is a true carburetor but not the most common style that you see on Briggs most of the time. The most common style I've run into is on the horizontal crankshaft engines which is the longer tubular style or maybe it's just the gas tank itself that's throwing off my recollection.
Most of the Briggs engines that look like this and have this style gas tank have the diaphragm and gasket style carb which is the larger diaphragm and not the little one that goes in the side like in this pulse jet.
I never have really liked this style but it does okay on the other engines but I much prefer the newer little small horsepower vertical shaft engines like these that have the metal gas tank the plastic carburetor and the primer bulb.
I guess the ultimate would be to have aluminum and a prime bulb so you wouldn't have the warpage issues that sometimes occur but rarely is there really any problem with the plastic ones so I could deal with that.
The primer bulb is so much nicer than having to deal with a choke and those don't have a mixture screw and I'm good with that too because once you put her new diaphragm and gasket in them and if they're clean, they always run just fine.
They are not my favorite Briggs engine though as I would much rather have the larger or upgraded one with the float bowl carburetor but still with an L head. I just really don't like the older, considered upgraded, Briggs & Stratton overhead valve engines because they're just more to go wrong, and it does, and the head gasket is blue easier and more often.
The old L heads just last and last and last and I hardly ever even have to worry about valves or valve adjustment.
It's nice to be able to just pull a head off quickly and fix things on it versus the seats being in the block and the valves having the annoying side access with the gasket that always breaks. Lol

 

[JoeZ]

Hello everybody!

I need some help or advice with my Briggs and Stratton 5 hp (Model 130902).
Tje problem seems to be with the Jet Pulse Carburetor.
Very simple, but I'm lost!

View attachment 65692

I can get it run but only without the airfilter – or more specific, without the screw in the middle of the carburetor's air intake (where the choke is).
Any idea what I should do, adjust or check? How should I proceed?

All ideas are welcome.
Thank you in advance!

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[balooba]

off my recollection.
Most of the Briggs engines that look like th

 

[balooba]

I ordered the Carburetor Kit for Briggs & Stratton from MSG Supply.
Super fast delivery, thanks!
(It took almost a month from my local post office to deliver the kit...)

I managed to replace all the gaskets and parts, I also carefully inspected the carburetor.
Looks clean and good. It also works.
Thank you all for all the help and advice.

But, I have a problem, for some reason the engine works but only if I adjust and control it manually almost non-stop.
I get it started and run pretty good. On idle or higher rpm but the engine stops easily in some situations.
Obviously the fuel works, ignition and no mechanical faults. It has to be something with some adjustements...

Where is the problem?
- governor setup?
- fuel-air-mix adjust?
- something else?

What should I check and how?
Let me know some ideas and how I should proceed with the adjustements.
Thanks in advance!

 

[SmallEngineHead160]

So a few questions: first off I'm not sure if I just can't remember or it was never stated
But what type of equipment is this engine powering I'm assuming it's a mower?
I apologize if it's stated already on this thread
I looked back over most of the thread but just couldn't find it.

Have you adjusted the mixture screw at all since carb rebuild?
Regular procedure would be one and a half turns out from fully seated, get the engine started then start turning the screw slowly one direction then the other untill the engine smooths out.
Fine tuning should be done with the engine warmed up to operating temperature.
Slowly turn the screw till the engine starts to run rough then turn it back opposite direction past the spot where it ran smooth until it runs rough again. Turn it back and find the sweet spot where it runs the smoothest inbetween sometimes you may want to repeat the process a couple times.

I would also check your governor linkege and spring make sure everything moves freely and is installed correctly.

 

[balooba]

So a few questions: first off I'm not sure if I just can't remember or it was never stated
But what type of equipment is this engine powering I'm assuming it's a mower?

Yes, it's powering a mower, Murray 5/25.

Have you adjusted the mixture screw at all since carb rebuild?

Yes I have. I have to tried do that very systematically and carefully.
I get the motor started, it will run. Both idle, low and high rpm, there is power. BUT, only if I manually ”manage” and control it. That means, I keep an eye on and adjust the throttle etc.
(my plan is to do a short video that would explain this more clearly)

Regular procedure would be one and a half turns out from fully seated, get the engine started then start turning the screw slowly one direction then the other untill the engine smooths out.
Fine tuning should be done with the engine warmed up to operating temperature.
Slowly turn the screw till the engine starts to run rough then turn it back opposite direction past the spot where it ran smooth until it runs rough again. Turn it back and find the sweet spot where it runs the smoothest inbetween sometimes you may want to repeat the process a couple times.

I will try to follow those instructions in detail. Funny is that this carburetor has only this one screw and still it's so complicated to me, ha haa.

I would also check your governor linkege and spring make sure everything moves freely and is installed correctly.

Good idea, thanks. I try to take some photos and upload here. Maybe some specialist could tell that the assembly is correct.

Thank you for the tips and advice!

 

[SmallEngineHead160]

Everything thing looks correct
The spring you are questioning just sticks in the hole with the spoke/linkege on the throttle shaft. I'm not really sure what it's for I just know they always seem to pop out of place.

Your governor spring looks fine, but sometimes they can get stretched, however it looks like it's pulling the throttle shaft all the way open in the fast position so it may be fine
But the only way to know is by checking the engine RPM. Which of course you would either need a tachometer or a trained ear to know what speed your running at.

So by managing the speed manually do you mean with the throttle control on the mower?
I just wanted to clarify.

If you could make a video I think that would help a lot