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Briggs and Stratton 3.5 HP wont stay running


Rough Rooster's Avatar
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Join Date: Feb 2014
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TX

07-02-14, 07:53 PM   #41  
On the magneto, there is a the left hand side screw mounting hole. Also there is the mounting plate for piece. And, I goes from just to the top of the flywheel to the top of the housing just about. I almost want to say that if the flywheel is spinning fast enough, it pulls the throttle to a closed position (air from the wheel catches on the piece). But I really don't know what purpose it serves. If I move it with my hand, the metal rod pulls and opens the throttle.
That is the "Air Vane Governor" and you are correct. It operates off the air coming from flywheel fan and blowing through the shroud to cool engine. Therefore the shroud is a requirement for any runtime past a minute to prevent engine overheat. As the air blows by the governor vane it makes the throttle go to idle except the throttle spring pulls the other way trying to rev up engine. The spring tension and air pressure even out to maintain fairly constant engine RPM.

RR

 
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Charliegates's Avatar
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07-02-14, 08:02 PM   #42  
I'll take a photo of the spring tommorow. And now it was hooked up when I took it apart. I do think that who ever had it before opened it up, because the top screw on the housing is not OEM. I really don't know how the spring hooks up. I can't seem to find any were online that has a spring like mine. The spring is about three bucks online.

 
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07-03-14, 08:24 AM   #43  
Okay, I went out to start it today and it did the same thing, so I let it sit for a bit. I went back about an hour later, then it started once and did the same thing. Then it did not want to even start at all after a few tries. So, I went and shook the tank, and viola! It started up and will idle and rev fine now. Maybe gas is not getting into the main pump well? Odd really. If thats even what is happening. I started it and ran it for a minute or two (an engine stand thing would be the ticket for me) and it reved fine and showed no signs of dying on me. I have the choke closed at start, then once I get it running, it reach down and open it to almost half.

About the governor spring. I can take photos to show you guys how it was hooked up when I bought it, and when I get a new one, do you think you could help me put it on? Aside from that spring, I plan to buy two new screws, one for the housing, the other was missing from the air filter pan. (holder)

-thanks! I really cannot thank you guys enough!

 
Rough Rooster's Avatar
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07-03-14, 03:16 PM   #44  
Now that you got it running, what are you going to do with it? Motorize your skateboard or put it on your Go-Kart?

RR

 
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07-03-14, 06:47 PM   #45  
well, if I can figure out why fuel is not reaching the small tank in the fuel tank, I will be set. I am not sure why it isnt? I planned to put it on a go cart. I am not sure why, but I have always been drawn to go carts, even though I ride dirt bikes and ATV's, with much much more horsepower than that.

Any ideas?

-Thanks.

 
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07-03-14, 07:50 PM   #46  
If it is worth mentioning...the diapragm did not fit hole by hole, but it did fit. I can take a photo of it, if that will help.

 
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07-07-14, 01:49 PM   #47  
Fixed! I looked in the gas tank and thought to myself "hmmm, that pickup tube is mighty close to the bottom of the tank." So, after another cleaning, I cut the screen off the end of the tube, and viola! I have let her run and run and run on her own with no problem at all for about ten or fifteen minutes! I am very happy! Thanks Sleeper and Rooster!

To Rooster, I was looking at my Kee mower, or possibly a go cart, but I am afraid that the go cart may run the risk of being underpowered. But, I will know soon! Now to buy the bolts for the air cleaner base, and top of the blower housing and a new spring and she will be ready to roll!

 
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