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Old 03-25-2011, 02:28 PM   post #1 of 31
sgull
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Default runs only on choke

My pressure washer has a Briggs engine Model Number 150212, Type 0122 E9, Code 070612 with a float bowl carb. It was running along just fine, when suddenly it just quit with kind of a low pop backfire noise. Hoping the problem was simply I was out of gas, I checked the tank and saw it was almost empty, maybe empty enough to cause it to quit. Filled er up with gas and tried starting it and it would run, but only on choke. Move from choke to run and it immediately cuts out. I pulled the bowl off the carb thinking maybe crud in there, did see very slight trace of fleck, emptied it out wiped it out, put it back together and tried starting again. Same thing. Only runs on choke. I took the main jet off and made sure it was clear, I poked a fine tag wire all the way through the holes in it to make sure, then reinstalled and tried again. In fact I did that twice to make sure. Exact same result, no change. So, thinking maybe a failing gasket (air leak), while it was running (with choke closed) I sprayed some carb cleaner behind the carb along the mating surface with the block if the engine to see if the tempo would change, but it didn't change at all. Also I took the fuel line off the tank and examined the entire line from the tank outlet to the line outlet, and all is clear there, no obstruction or restriction. Put things back together and tried again. Same result. Absolutely no change. Runs when carb is choked only. Move to run and it immediately cuts out. Any ideas what could be causing this issue and why what I've tried so far hasn't helped? Must be something I'm missing, it cant be this complex.
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Old 03-25-2011, 02:33 PM   post #2 of 31
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Default Re: runs only on choke

Check the flywheel key, it could be damaged and throwing off the timing.
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Old 03-25-2011, 02:54 PM   post #3 of 31
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Icon2 Re: runs only on choke

Check spark & plug.. replace plug if fouled.. Check the compression.. A sticking valve could cause your trouble.. If this is an OHV engine, pop the vlave cover and check the rocker arms and valve movement..
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Old 03-25-2011, 03:25 PM   post #4 of 31
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Default Re: runs only on choke

Okay Hootboot I took off the flywheel cover and can see that the end of the flywheel key is still positioned where it should be in the keyway on the shaft, matched up with the keyway on the flywheel itself.
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Old 03-25-2011, 03:59 PM   post #5 of 31
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Default Re: runs only on choke

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Originally Posted by sgull View Post
Okay Hootboot I took off the flywheel cover and can see that the end of the flywheel key is still positioned where it should be in the keyway on the shaft, matched up with the keyway on the flywheel itself.
To be sure that the key is okay....If you can, you need to remove the fly wheel and inspect the key. Sometimes the key will very slightly shear/cut and not break all the way thru and it will throw the timing off enough to act crazy. It will look fine from the outside but can be sheared/cut just a little when you pull the fly wheel....

With it running only on choke...I think you may still have some trash in the carb somewhere.

Did you remove the float and needle and clean it and the fuel inlet?

If you have not already...I would suggest using some spray carb cleaner on the carb.

Let us know your results?
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Old 03-25-2011, 04:37 PM   post #6 of 31
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Default Re: runs only on choke

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It will look fine from the outside but can be sheared/cut just a little when you pull the fly wheel....
With it running only on choke...I think you may still have some trash in the carb somewhere. Did you remove the float and needle and clean it and the fuel inlet? If you have not already...I would suggest using some spray carb cleaner on the carb.
Yes I removed the float and needle and cleaned the fuel inlet. I neglected to mention that I also blew air backward from the carb side of its fuel inlet (where the needle seat is) and there's no sign of restriction/blockage there. If I still have trash in the carb somewhere I'm at a loss as to where it could be, unless its possible its within the passages that might be only cleanable by removing the welch plug. I've already cleaned up the carb good with carb cleaner everywhere else. I poked tag wire through the pickup tube in the middle, etc. I think thats all clear.

I suppose I could pull the whole flywheel off to look at the entire key, but I don't have the puller tool required to do that.
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Old 03-25-2011, 04:41 PM   post #7 of 31
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Default Re: runs only on choke

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Originally Posted by WNYTractorTinkerer View Post
Check spark & plug.. replace plug if fouled.. Check the compression.. A sticking valve could cause your trouble.. If this is an OHV engine, pop the vlave cover and check the rocker arms and valve movement.
I get spark because the engine runs, but only on choke. The plug doesnt particularly look fouled, looks rather good as a matter of fact. It is an OHV engine, and I've already checked to see if the rocker arms move up and down while the engine is turned, they move up and down normally.

I suppose I could check the compression if you think that could be involved somehow in the problem as I've described it. But I don't have a compression tester.
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Old 03-25-2011, 09:58 PM   post #8 of 31
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Default Re: runs only on choke

Be careful blowing air thru the fuel line into the carb with the needle out some carbs have a flexible seat (some type of rubber or....) and you can blow it right out of the carb. Ask me how I know! 1 hr looking for it!
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Old 03-25-2011, 10:07 PM   post #9 of 31
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Default Re: runs only on choke

you say you poked a wire through the holes but did you clean the bolt holding the float bowl on?


that is an often overlooked spot and may be your problem.
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Old 03-25-2011, 10:08 PM   post #10 of 31
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Default Re: runs only on choke

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Originally Posted by cubguy2165 View Post
Be careful blowing air thru the fuel line into the carb with the needle out some carbs have a flexible seat (some type of rubber or....) and you can blow it right out of the carb. Ask me how I know! 1 hr looking for it!
As I tried to describe, I blew the air backward from the carb side of its fuel inlet, so I was blowing toward the side of the seat where the needle seats, outward not inward toward the carb body. And my needle seat does happen to be the flexible rubber type, as you mention. Glad to hear you were able to finally find the seat you blew out. If I decide to blow the other way I'll be careful.
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Old 03-25-2011, 10:37 PM   post #11 of 31
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Default Re: runs only on choke

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Originally Posted by dirtybernie View Post
you say you poked a wire through the holes but did you clean the bolt holding the float bowl on?
Yeah the bolt that holds the float bowl on, which is also the "main jet" has three holes in it. One passage that goes through the threaded portion with its two holes (or openings) on each side, and then the other hole in the tail end of the bolt which goes down the middle center of the shaft of the bolt and meets with the passage through the threaded portion. These are the holes I poked the tag wire through to clean out any possible obstruction. Did it twice. Those passages are clean and clear. I wish I'd had found an obstruction and cleaned it from the main jet, then the problem would have been easily solved. But that isnt the case.
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Old 03-25-2011, 11:13 PM   post #12 of 31
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Default Re: runs only on choke

I would say it's definately in the carb...if it were ignition, then it wouldn't run at all. I had a 318 that backfired and blew one of the plugs out of the carb that caused it to not run at all unless the choke was on. Can you start it at idle will it run without the choke then? If so, you either have too much air or not enough fuel due to something plugged or missing. Sounds like you checked for the intake leaks...will it run at idle?
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Old 03-26-2011, 12:26 AM   post #13 of 31
sgull
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Default Re: runs only on choke

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Originally Posted by Realbiker View Post
Can you start it at idle will it run without the choke then? If so, you either have too much air or not enough fuel due to something plugged or missing. will it run at idle?
I guess I'm not sure exactly what you mean by "idle". The lever has the "choke" position on one end of it's movement, and the "run" position at the other end. It will only run in the "choke" position and as soon as its moved away from that position it stops running. It won't start in the "run" position at all. Is the "run" position the same as what you would be referring to as "idle"?

As I mentioned I checked for air leaks by spraying carb cleaner around the mating surface between the carb mount and the engine block while it was running (on choke, because that's the only time it runs) and there was absolutely no change in the tempo of the engine. If there's a blockage/obstruction within the carb causing it to starve for fuel I don't know where else to look other than where I haven't already looked and that would be the passage(s) behind the welch plug. And if there's an air leak I don't know where else I'd look either. You said maybe something missing? Like what would be missing?
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Old 03-26-2011, 12:42 AM   post #14 of 31
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Default Re: runs only on choke

Try this--

Pull the mfuel line off the mcarb and makemsure you havem na full flow of fuel. If not-your problem is in the fuel filter / screen- IF GOOD flow problem is in the carb OR the fuel line (old-cracked)
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Old 03-26-2011, 12:54 AM   post #15 of 31
sgull
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Default Re: runs only on choke

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Pull the mfuel line off the mcarb and makemsure you havem na full flow of fuel. If not-your problem is in the fuel filter / screen- IF GOOD flow problem is in the carb OR the fuel line (old-cracked)
I already did as you suggest, and there is full flow of fuel out of the fuel line when I run the fuel into a cup while the fuel line is disconnected from the carb. I examined the fuel line and it's in good shape, its not old nor cracked. There is no fuel filter or screen, never was (probably be best if there was but there isnt any). Already determined the problem is with the carb but can't find where/what.
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