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#1
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Re: Lawnmower Engine Starting Tips??
Sounds like the A/F mixtures are somewhat fubar-ed.
I think the reasoning behind why the instructions (on the carb-cleaner bottle) say not to use while not running is because the stuff is pretty flammable -- if you cranked your engine right after you sprayed a bunch there's a chance something can go bad. Additionally, the engine has to suck the stuff in, also carb-cleaner has xylene, which smells bad, and is a carcinogen. Just get a pal to crank the engine continually while you spray inside the air intake. All carbs make a hissing noise, it's part of their design to get the air flow moving around the intake... if it's pretty loud then I'd definetaly say there's stuff in your carburetor that's probably causing your engine to choke. |
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#2
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Re: Lawnmower Engine Starting Tips??
Sanddrag,
The carb has a sump tube that runs down into the gas tank and the tube has a screen filter at the bottom. If the gas had been sitting any length of time, the screen could be gummed up. As I remember the carb kit has a new screen as well. Since there is no fuel pump, the hissing sound is the carb trying to suck gas in from the tank, or bypass air around the choke or gas evaporating when it hits the hot engine parts in the intake. Since the engine runs if you squirt gas into the carb, suspect fuel delivery. You may find a manual online if you haven't looked already. B&G may group engines by family so the entire part number will not get a hit on their site. BTW, the choke (if not manual) is designed to open shortly after start. If it does not, try holding it open with a screwdriver while you start it the second time. |
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#3
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Re: Lawnmower Engine Starting Tips??
I referenced the B&S website and my other slightly different B&S engine and I know I've got the mixture needle in the ballpark.
For the carb cleaner, what's the worst that can happen, it flashes a little bit? Also, the carb is a manual choke. For the engine model number, I haven't even found it on the engine. I can't tell exactly where the fuel comes into the carb. The carb is mounted directly to the top of the tank though, so I suspect it is as Al says. I guess I'll just have to pull the thing apart and figure out how it works! (unfortunately in is like in the 90's outside today making for miserable outdoor work). One question I had was is it possible it is the gas cap not venting properly and making a lower pressure when the engine tries to pull gas in? Maybe I can try loosening the cap to give it some more ventilation. Once again, thanks for all the help. I'll try to figure out if there are any problems with the fuel supply. Also I was wondering about one more thing. There is a rubber hose (maybe 3/8" diameter) that runs from the engine (upper part, but not on top) to the choke area of the carb. Any idea what it is for? |
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#4
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Re: Lawnmower Engine Starting Tips??
Maybe this link will be helpful: Briggs & Stratton troublshooting
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#5
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Re: Lawnmower Engine Starting Tips??
Quote:
I pulled the carb and gas tank off (one of those carb bolts is real tough to get to, not sure how I'm going to put it back on) and the gasket mating the two was shot. The lawnmower shop was closed so I used some red silicone rtv instead. It said not recommended for use by gasoline, probably because the gas will eat away at it, but it should work at least for a while. I'm guessing anything will be better than the rotted and split gasket that was there. I cleaned the carb and the fuel tube screeens well with carb cleaner. Hopefully once put back together, this thing will run. I'll keep you posted! |
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#6
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Re: Lawnmower Engine Starting Tips??
Quote:
Problem - No fuel going from the circular fuel tank (located under the carb) going to the carb What has been checked Thus Far: 1) Made sure the fuel line is clear and getting to the circular fuel tank through its provided fuel lines. 2) Checked and cleaned Carb and any methods that get fuel into the carb. 3) Fuel & Oil has been changed as well as spark plugs and air filters are concerned. What HASN'T been checked: 1) Primer Button which just so happens to be built into the Carb Assy. thus if I have to replace one thing I would have to replace the entire Assy. Fuel is going from the main tank into the circular tank just not going from the circular tank to the carb. ![]() |
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#7
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Re: Lawnmower Engine Starting Tips??
Well, the carb was cleaned and sealed back on the gas tank and reinstalled on the engine. I got it to run really good for about a minute. I took it all the way through the throttle up to WOT and it was really punchy. The only thing is that is would bog down at idle, and if I did not rev it back up, I knew it would stall. So, I ran it for about a minute then I let it stall so I could adjust the idle stop screw (screwdriver wasn't withing reach while running).
Anyway, I never could get it going again. Only a few seconds at a time by putting fuel right into the carb. So anyway, I've given up. This week I might take it to the lawnmower shop and see what they say. |
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#8
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Re: Lawnmower Engine Starting Tips??
I had a similar problem with a VW beetle's carb.
It hadn't been run for a while, and there must have been years of gunk in the carb and intake track. Since we couldn't get it to take up fuel with out just flooding the engine and/or killing the batter, we pinched the fuel line and had someone just spritz some engine starter in the carb till it caught, and again every time it started to bog down. It ran very poorly at first, owing to all the gunk in the engine, but after about a minute of running on ether, she was doing pretty well. We hooked up the fuel line again and from then on she managed to carborize on her own. The more she ran, the better she did, and the easier she was to start afterwords. My suggestion is to try starting it with some starter fluid, and keep it running like that for a bit. My guess is that after a little bit of running, it will manage to take up enough gas to keep running on it's own. Then, just let it heat up at about half throttle, and run most of the tank through. Keep doing it till she's begging to get started again. Some more conservative minds don't seem to like the idea of using so much starting fluid. I've used it a bunch, and never had anything blow up or die prematurely. -Andy A. |
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