I have a 6hp Briggs on a Toro GTS Recycler mower and recently removed the carburetor to clean everything except the welch plug. No issues with the engine starting and running just fine .Yesterday I began noticing a stronger than usual gas odor but didn't see any fuel leaking from the carburetor. I primed the engine,started it and it refused to idle down.After killing the engine I noticed fuel dripping around the air filter housing. Any thoughts as to what my issue might be.Leaves are starting to drop and i sure want to stay on top of keeping them mulched
Thanks
#2
Boudreaux In Eunice La.
Float could be stuck... Did you change the seat ??
Everything cleaned up extremely well with no visible varnish and I can work the linkage without it sticking at all. When I started it after putting everything back together I thought I was home free. But apparently not.
#4
Boudreaux In Eunice La.
Take the carb off again which is a whole 3 minutes of work and put a fuel line on it.... Holding the carb in it's upright position blow into the line.. Air should pass thru easily..
Now turn the carb upside down and do the same thing.... No air should pass at all thru the needle and seat.......... Listen very well for a hissing sound....
If it does pass air thru then you found your problem...... Is it a regular L head or over Head Valve engine ???
In all my years of working on small engines I had only 2 carbs that would not seal right on that type of carb.......
One other thing is that maybe, just maybe that your O ring on the intake is bad also.........
You said the engine was racing ..... Your governor rod or spring might be caught or stuck...... Can you take a couple pics and post ??
I have removed the carburetor as suggested and have blown through it with the fuel line attached.With it upright I can definitely hear air passing through.When turned upside down I can also hear a small amount of air but when I tap on the carb bowl maybe the needle valve seats completely because it feels like i am blowing into a line that is plugged on one end.
The model number of the mower is 12H802 and the type is 1776-B1
Attached are a couple of pictures which might be of no value in helping diagnose my issues.
Attachments
#6
Boudreaux In Eunice La.
The seat needs to be changed more than likely. That will solve your leak problem.
The middle picture is not the very lit up but from what I can see the linkage looks funny like some thing is hooked up wrong.. That could be the issue with racing of the engine.......
One quick question before I start buying parts that I might not need.
The small pin that holds the float in place was somewhat difficult to remove when I initially removed the carb to clean it and it is possible I scarred the surface pulling it out with my pliers. Is it at all possible that the tolerance between the pin and the two holes on the carb body which it passes through is so close that a rough surface could cause the float to stick and not seat?
As for the linkage,I am certain I attached the linkage rod through the same hole on the butterfly valve as it was when I removed it and there were no issues with the engine racing before.
#8
Boudreaux In Eunice La.
Sorry for the late reply .... As long as the float moves freely you are in good shape. A kit includes the pin, needle and seat also... Plus a few other items not needed on your carb... IE the adjustment jet and one bowl gasket. They come with 2 gaskets....
If you have a auto choke style carb the thicker gasket goes on that one... A primer style carb uses the thinner gasket...
If you have auto choke then the smaller air box gasket is used... For the primer then the gasket with the odd ball shape goes for that one. Both need to be put on the air box before you install it on the carb.... Not both as in all together LOL .....
Another pic that is well lit on the hook up on the carb would be helpful also or 3 pics ........
It has been a while since I last posted about the carb issues(flooding when not running) mentioned in this thread. Up until today it has not been doing so but it started again.My next step will be to remove and replace the seat but I do not have the specialized tool recommended to do so. Has anyone removed and replaced the seat by other means and if so what did you use?
Thanks
#10
Boudreaux In Eunice La.
Watch this video It tells you everything from a buddy of mine........
It has been a while since my last post about my mower. In that time I removed the carb,cleaned it as suggested by watching the suggested youtube video and replaced both the float seat and needle valve.First time out the mower operated fine except for seeming to maintain somewhat of a higher than what I thought a normal operating sped would be without being under a heavy load. Just used it for the second time yesterday and more issues. About halfway through mowing my yard the speed started to fluctuate up and down as if the engine was starving for fuel. Checked and found plenty of gas in the tank. Took 8 to 10 pulls to get the engine started again and again the same up/down engine rpm issue. Finished mowing and with the engine stopped gas started flowing out the carb are at the primer bulb. I tapped the bowl of the carb with a screwdriver handle and the gas flow stopped. The only thing not replaced inside the carb is the float itself and a reed valve if it has one. I got this mower ffee and it is in all but new condition.I hate to give up on it so any further advice is appreciated.
#14
Boudreaux In Eunice La.
No reed valves in that carb...... Something is still not right with that carb.... A racing engine and or surging could be your governor.....
Since is was free some body else might have played with it..........
While no certainty as for someone doing something to the mower before I got it,I did get it from the original owner who appeared to have had it serviced by a repair shop as evidenced by black felt pen writing on one side of the air filter to indicate the owner.Why write there I haven't a clue.The original owner did say I might have to clean the carb due to the mower having sat unused and I assume with gas in the unit for a full year.
So here is the latest update. I looked back and can't find mentioning in any of my previous posts that the carb bowl has a dent in it. After talking with a nephew who has worked on small and other engines for many years. I also mentioned the governor linkage being in the hole on top of the carb that did not have a plastic grommet in it. .He suggested I knock the dent in the bowl out as much as possible and move the linkage to the hole with the grommet. I am probably going to jinx myself but last time i used the mower it primed without leaking gas,started quite easily and ran smoothly the entire time.Moreover,I intentionally put the fuel level so it would run out so i would have to add more before finishing the job to see if the previous issues about gas leaking and engine barely starting then stopping would happen as before. They did not and the engine started and ran fine until I finished. I would have never thought the float could be possibly sticking due to the dent because I could hear it falling to whichever side was down when I had the carb off and flipped it from upright to upside down. Guess i will know more next time i mow but if tapping out the dent solved my problem then I am delighted. I will probably replace the bowl sooner than later simply because it will nag me to know it is not round as it should be.
Thanks to Boudreaux in Eunice LA and others who have freely given their thoughts and suggestions.I hope i can learn enough to do the same.
#17
Boudreaux In Eunice La.
Billy thanks for the reply......... Glad you got it going ............ I don't see a post about a dented bowl either.....
If you had the linkage in the wrong hole yes it will race or act funny ........... Ok I have a link to a vid on your carb on taking it off and putting it back on....... Skip the video to the 14:00 mark
Now this might not be your carb with an EZ start auto choke..... So disregard the choke part.... See how he takes the carb off at 15:02 ......
That is the hole you want... Some carbs have 2 holes on them, you want to put the linkage in the outside hole.... Then he shows the bowl nut cleaning also .............
Thanks for the video Boudreaux. The linkage running from the carb to the governor on my engine has a different configuration than that on the engine in the video. Amazing that Briggs builds so many different engine models within the same class/hp. I am attaching a picture of mine just for show. When I originally took the carb off to clean it the linkage was in the hole on top without the plastic grommet. After several times removing the carb to try to determine why gas would flood at odd times and why the engine would race,run as if it had no power and ultimately die,I moved the linkage to the hole with the grommet. Now maybe it is in the wrong hole now and the big problem was the float somehow sticking to the bowl just enough to cause the fuel supply to fluctuate not allowing enough supply while running and then flooding when off. I guess I would not know unless I were to put the linkage back in the hole without the plastic grommet and see how the engine speed runs. If the engine continues to operate normally next time I mow I am inclined to leave things as they are.
