Should Have Left Good Enough Alone - Snowblower Forum : Snow Blower Forums
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post #1 of 29 Old 12-22-2015, 08:58 PM Thread Starter
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Should Have Left Good Enough Alone

I recently purchased a 30 year old single stage Bolens 320. It's powered by a Briggs 62030 2-cycle engine that has a diaphragm style carburetor.

After a little work it was running fine, although it would surge just a bit. A few days ago I put about 1.5oz of Seafoam in the cylinder to give it a good cleaning, I can see the carbon build up on the piston behind the plug easily. I let it sit until yesterday and started her right up. It smoked like crazy, but ran fine. It was certainly still surging a bit, but I expected that.

I then attempted to adjust the needle valve. I adjusted it several times, both clockwise and counter-clockwise. Nothing seemed to make a difference. After the last adjustment, I couldn't get the engine started again.

I let it sit over night, but that did nothing. I even changed the spark plug, but still nothing. I opened the carburetor, but it looked clean. There is not reason why it wouldn't be clean. There is definitely fuel coming from the tank to the carburetor, there is no blockage. The only way I can get it to turn over for just a few seconds is to either add Seafoam to the cylinder or add starting fluid to the carburetor.

Just to note, the primer is definitely showing some age. It is cracked and fuel does come flying out after a few pumps. This is nothing new, it has happened since the day I bought it a few weeks ago.

I have no idea what to do next.

Any ideas?

Here's a link to the engine.

Briggs and Stratton 62030 Series Parts List and Diagram : eReplacementParts.com
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post #2 of 29 Old 12-22-2015, 09:42 PM
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The seafoam and starter fluid seem to be giving better combustion in the short term. Maybe instead of seafoam put a little bit of motor oil in the sparkplug hole to see if it would run as this might give better compression. What fuel mix are you using a 50:1 maybe?

Last edited by Kiss4aFrog; 12-22-2015 at 10:44 PM.
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post #3 of 29 Old 12-22-2015, 10:01 PM Thread Starter
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The seafoam and starter fluid seem to be giving better combustion in the short term. Maybe instead of seafoam put a little bit of motor oil in the sparkplug hole to see if it would run as this might give better compression. What fuel mix are you using a 50:1 maybe?
Manual says to run 30:1, so that's what I have been using.
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post #4 of 29 Old 12-22-2015, 10:06 PM
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My guess is the seafoam broke loose some gunk and is now stuck in a passage way. Even though it looks like you just cleaned it one speck could clog the carb.

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post #5 of 29 Old 12-22-2015, 10:25 PM
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My guess is the seafoam broke loose some gunk and is now stuck in a passage way. Even though it looks like you just cleaned it one speck could clog the carb.
I agree. If the last thing you were doing involved the needle valve, I would go back to that. Did you mark the original position so you could return to it? Did you by any chance close it all the way at any point? Is the tip or seat damaged?

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post #6 of 29 Old 12-22-2015, 10:45 PM
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post #7 of 29 Old 12-22-2015, 10:54 PM
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Is the spark plug wet after trying to start it multiple times? Two strokes store excess fuel in the crankcase and you may have to remove the spark plug and pull the recoil until your arm is tired to purge the excess fuel.

Have you tried putting a little fuel mix into the cylinder and try starting it, to prove it is a carb issue?

Have you confirmed you still have spark when trying to start it?

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post #8 of 29 Old 12-22-2015, 11:22 PM Thread Starter
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Great. Lots of suggestions.

I don't think the needle valve has any problems. I did pull it out and inspect it. I'm not expert, but it looked fine.
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post #9 of 29 Old 12-22-2015, 11:59 PM
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Great. Lots of suggestions.

I don't think the needle valve has any problems. I did pull it out and inspect it. I'm not expert, but it looked fine.
Still looking for a blockage. Since it fires when youninject fuel, you know o have spark, I assume you have good fuel and air, but the fuel isn't getting past the card is what it sounds like.

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post #10 of 29 Old 12-23-2015, 09:35 AM
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While the needle looks fine, the little passageways that go toward, and away from the needle may be clogged. It may need a good soaking, and a blowout.
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