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post #1 of 23 Old 01-19-2018, 04:53 PM Thread Starter
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Now what?

So I fixed the broken fuel line and also the broken pull start cord. Then I gave it quite a few pulls. Yes I primed the machine and the throttle and choke were up - and the red key was in. But no luck. So I took the spark plug off and shot some into the cylinder chamber. Still no luck. Oh yeah, before that I did check to see if I had a spark and yes I do. And there is gas reaching the carb because when I press the drain plug gas comes out. So what's the next logical step? Clean the carb out or maybe just replace it - or maybe something I overlooked? Machine is a 1999 MTD 10HP Tecumseh. This machine ran great in October!
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post #2 of 23 Old 01-19-2018, 04:57 PM
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Does it have compression. Put you thumb over the plug hole and give it s yank

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post #3 of 23 Old 01-19-2018, 05:07 PM
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You may have a little water in your carb and/or gas tank.
Get a can of ether and squirt some into the carb to see if you can get it to fire off a little.
You may want to clean the main jet in the carb.

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post #4 of 23 Old 01-19-2018, 05:10 PM Thread Starter
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Does it have compression. Put you thumb over the plug hole and give it s yank
Yeah, I did that and it does have pressure. When I pull start, it makes a farting type of sound almost like it's going to fire up. Close but no cigar...
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post #5 of 23 Old 01-19-2018, 05:12 PM Thread Starter
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You may have a little water in your carb and/or gas tank.
Get a can of ether and squirt some into the carb to see if you can get it to fire off a little.
You may want to clean the main jet in the carb.
Yeah. I was kind of hoping it would fire up without having to work on the carb. I did drop the bowl and cleaned it the other day.
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post #6 of 23 Old 01-19-2018, 05:17 PM
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Yeah, I did that and it does have pressure. When I pull start, it makes a farting type of sound almost like it's going to fire up. Close but no cigar...
You need higher octane beans.
Try some ether if it's that close to firing up.

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post #7 of 23 Old 01-19-2018, 05:21 PM Thread Starter
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What I don't get is this: I have ignition and compression and with quick start it should go at least for a bit - even if the carb is bad. But I don't have anything right now. How come?
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post #8 of 23 Old 01-19-2018, 06:03 PM Thread Starter
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You need higher octane beans.
Try some ether if it's that close to firing up.
I did use ether-based quick start spray. Like I said it just did some putt, putt sounds each pull but nothing more. I shot a couple of shots of spray (about one or two seconds) each time. Does it need more than that?
Yes. I am full of beans - says my wife.
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post #9 of 23 Old 01-19-2018, 06:03 PM
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Pull the spark plug and put a shot of starting fluid directly in the cylinder, reinstall the plug and pull. If it starts you have to go back to the carb.

The main idle jet could be plugged not sucking fuel up from the bowl and you may have to take it apart again, this time taking the carb off and laying it on a bench to work on it (hopefully it's not the kind of Tecumseh carb with those stupid welch plugs). Remove the main idle tube and look at it under a magnifying glass - make sure any teeny tiny holes are cleared out. Use the smallest wire possible, like unstrand a piece of copper zip cord and use a single copper thread or uncoil a ballpoint pen spring if you need something stiffer. Don't mess with the needle or seat, if you have fuel in the bowl and it doesn't flood they are fine.

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post #10 of 23 Old 01-19-2018, 06:33 PM
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To run, you need fuel, spark, and compression.

It sounds like you have fuel, at least temporarily, using the ether.

You're getting at least some compression. But if a valve is not fully sealing, etc, you may not be getting enough compression. If you have a compression tester, that could help answer the question better.

You're seeing a spark, which is good. That doesn't fully guarantee you have spark under compression, which is more difficult. An inline spark tester would help show if you're getting a spark with the plug installed.

The last thing that you need is for the spark to happen at the right time. If the engine received some sort of blow (augers suddenly jamming against something solid, etc), it's *possible* (though not common) for the flywheel key to be sheared, which changes your ignition timing. So you could be getting a spark, but too early or late.

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