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Old 07-07-2010, 12:05 PM   #16
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Lawn Mower starts for two seconds then dies


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Originally Posted by Stillwerkin View Post
Same thing happened to me.
-I kept the thing going by taking off the the air filter and kept pushing the primer when it started to falter.
-I also ...
Thanks for this. I'll try it tonight when I get home from work and report back...

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Originally Posted by DangerMouse View Post
Good idea.... also, how old is the gas? Did you put in fresh?
DM
It's brand new gas. I changed the gas when I changed the oil.

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Originally Posted by Yoyizit View Post
Yes, whatever tech. info on this that you can beg, borrow or steal, online or off. Sometimes I look in library books on small engine repair for ideas. Occasionally a book will mention some detail that the others omitted.
I'll go dig around and post what I can find.

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Old 07-07-2010, 12:12 PM   #17
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Lawn Mower starts for two seconds then dies


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Thanks for this. I'll try it tonight when I get home from work and report back...



It's brand new gas. I changed the gas when I changed the oil.



I'll go dig around and post what I can find.
Not exactly the same engine, but I had the same problem with an old 4 wheeler that was 4 cycle. A friend borrowed it and mixed the gas like it was a 2 cycle, and never changed the oil and rode the hell out of it... burnt the rings and had to replace them.
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Old 07-07-2010, 12:51 PM   #18
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Lawn Mower starts for two seconds then dies


You can check that you have ignition by putting a spark gap in series with your spark plug.

If you use another spark plug for this gap, close it down to 0.01" or so, about the thickness of 2 sheets of copy paper.
To withstand engine vibrations you will have to mechanically secure the extra plug to the engine housing with insulating material that can stand a few KV. Dry wood comes to mind.
As long as you see a spark in the tiny gap you are getting ignition.

Alternately use clear tubing, epoxy and parts from other spark plugs to make your visible spark gap. This will be smaller and lighter so it may stand on its own. You could use a 6-32 machine screw sharpened to a point to mate with the screw-on connector on top of the plug, or use paper clip wire [which is springy]. The current through this gadget is only a few mA.

An old neon timing light may also work, but the ignition voltage for a small engine may to be low for this.

I've never had to make one of these gaps, not yet. . .

Last edited by Yoyizit; 07-07-2010 at 12:58 PM.
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Old 07-12-2010, 11:54 AM   #19
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Lawn Mower starts for two seconds then dies


fuel pump...
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Old 07-12-2010, 12:23 PM   #20
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Lawn Mower starts for two seconds then dies


I would have suggested the fuel cap like another person already said. I know you said you blew it all out of the carb, but years back my father and I had similar problem and it wasn't until we took a very fine piece of wire and cleaned out each hole on the carb that the gallons of gumout had not cleaned apparently...after that it was fine. Sounds to me it is choking itself or the fuel is getting in the carb, but not getting out. Please post again when resolved - many of us will encounter this no doubt at some point....
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Old 07-12-2010, 01:59 PM   #21
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Lawn Mower starts for two seconds then dies


Have mower outside, no kids around, fire extinguisher handy and have a friend spray gas with a windex bottle into intake with carb removed and see if it'll stay running. Sounds like you have a stuck gas inlet needle in carb that needs changing.
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Old 07-12-2010, 03:02 PM   #22
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Lawn Mower starts for two seconds then dies


I have had this same prob before on a push mower I had. I thought it might be the primer bulb as it was worn out, I thought it might have been sucking air through a crack on the bulb. Turns out that it wasn't the prob. I wound up having to replace the whole carb. I went through a lot of the same stuff you have to no avail. After putting the new carb on it ran like a new one. Jonathon
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Old 07-14-2010, 07:38 AM   #23
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Lawn Mower starts for two seconds then dies


how long has it sat with gas in it? did you drain the tank then run it dry before you stored it last winter? sounds like a dirty carb.. i know you cleaned it so if its not still dirty it may need rebuilding.. try replacing the float, gasket, needle valve and the tiny seat in the hole the needle valve sits in.... Bring the carb to the shop with you and have them remove the old needle valve seat, its easy for them to blow it out with a compressor.
Then, Use something about the same diameter of the gasket to push the new one down fully into the seat or the needle valve wont work and gas will pour out of the carb.
I had a woodchipper that would only run on starting fluid, i took off the carb, cleaned it and it still didnt work so i rebuilt it and added an inline gas filter, that did the trick...also, do yourself a solid, when you remove the carb and install the inline filter, also install an inline gas shut off valve, makes working on the carb and draining the tank much more of a pleasent experience. When you get it running, go buy a can of sea foam and add some to your gas... just to keep things clean and fresh.
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Old 07-14-2010, 09:39 AM   #24
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Lawn Mower starts for two seconds then dies


You got that right Zacker on using Seafoam, and a great post I might say. This new gas we have, it really gums up the carbs not only in lawn mowers but very destructuve with outboard motors. When gas sits like in a lawn mower or a outboard things start happening after several months and you wind up with "skin" like substance in fuel lines ,carbs and fuel pumps. On my outboard I had a stuck electric fuel pump and a new one cost 800 bucks plus labor for replacement, but I found out by reversing the 12v polarity and 40 trys it broke loose, and soaking in Seafoam overnight of course. There is a blue liquid bought from Napa (can't think of the name) that prevents the breakdown of gas over the winter that I now use.
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Old 07-14-2010, 09:46 AM   #25
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Lawn Mower starts for two seconds then dies


I'd speculate that your carb is totally fine based on the comment that after pumping the primer bulb that it starts EVERY time and runs for a few seconds and dies...which is the time it takes to burn the gas that you provided it via the pumping of the bulb and then it stalls simpy cuz it's not getting any more gas. If there were issues with the carb I would think it wouldn't start and run and die so consistently ...albeit very briefly. So...if it has a fuel pump I'd go there first and foremost. If no fuel pump...check/replace the fuel line between the tank and primer bulb for obstructions.

So it's been a while now....how is it going? What have you tried lately? Inquiring minds want to know.
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Old 07-14-2010, 10:12 AM   #26
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Lawn Mower starts for two seconds then dies


I may be wrong here but if the primer bulb is gassing it up, then how could the gas line be blocked?? or does your machine have a seperate line for the primer bulb? plus useing the bulb could be filling the bowl with gas where as the carb isnt getting the suction on its own to take in gas by itsself. I still say dirty carb, rebuild it..hey for $10.00 its worth it even if it turns out to be something else. I dont believe these small engins even have a feul pump.. do they??
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Old 07-14-2010, 10:23 AM   #27
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Lawn Mower starts for two seconds then dies


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I may be wrong here but if the primer bulb is gassing it up, then how could the gas line be blocked?? or does your machine have a seperate line for the primer bulb? plus useing the bulb could be filling the bowl with gas where as the carb isnt getting the suction on its own to take in gas by itsself. I still say dirty carb, rebuild it..hey for $10.00 its worth it even if it turns out to be something else. I dont believe these small engins even have a feul pump.. do they??
Many of these small engines don't have fuel pump...but I believe some do. I have a lawn edger that had exact same symptoms of the OP....was fixed under warranty and was told it was the fuel pump. It COULD potentially be getting gassed up by the primer bulb but not normal running if the pressure created by the primer bulb is enough to overcome any blockage but normal operation is not enough. That's a stretch but possible. To me...the issue is related to whatever mechanism is responsible for providing fuel during normal engine running. The primer bulb operation is an initial substitute for that mechanism to get things started. An easy test would be start er up and keep pressing the primer bulb...see if she continues to run.
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Old 07-14-2010, 11:08 AM   #28
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Lawn Mower starts for two seconds then dies


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Many of these small engines don't have fuel pump...but I believe some do. I have a lawn edger that had exact same symptoms of the OP....was fixed under warranty and was told it was the fuel pump. It COULD potentially be getting gassed up by the primer bulb but not normal running if the pressure created by the primer bulb is enough to overcome any blockage but normal operation is not enough. That's a stretch but possible. To me...the issue is related to whatever mechanism is responsible for providing fuel during normal engine running. The primer bulb operation is an initial substitute for that mechanism to get things started. An easy test would be start er up and keep pressing the primer bulb...see if she continues to run.
Thats kinda the way mine was. If I held the primer about half way in it wuld run,but as soon as I let go it would shut off. I wound up cleaning the carb a couple times to no avail. Wound up getting a carb from my grandfather that was the same type, put it on and she ran like a new one. Not really sure what the real prob was,but do know it was in the carb. Jonathon
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Old 07-14-2010, 12:21 PM   #29
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Lawn Mower starts for two seconds then dies


the gas eats at all the elastomers in the fuel system.. the lines can rot and leak (happened to a chainsaw and a leaf blower) and also, esp. in two stroke engins like weed wackers, the carbs have a diaphragm instead of floats and it can get soft and not work and youll get the same thing.. it will run on a prime or starting fluid but not on its own.. rebuild the carb, be sure to run a wire in each hole and spray alot of cleaner throught them too, you can soak it all in sea foam for a day or two also..but for the $10 or $15 you spend, its well worth it!
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Old 07-14-2010, 01:13 PM   #30
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Lawn Mower starts for two seconds then dies


It's been a while since I updated you all on my progress - I have been out of town for the last week. I have been reading some of the new replys, and there are more good ideas I need to go try. The last thing I tried was Stillwerkin suggestion of creating a choke with my hand over the air intake. Unfortunately, it didn't help.

I'll start through the list of new suggestions tomorrow and over the weekend. At this point, I'm determined to get this thing running. I'll be sure to post the solution WHEN (not if) we find one.

Thanks again for all your help!

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