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Hello All - A friend moved south and gave me this beautiful, hardly used unit. It has never run quite right. The rpm would surge up and down and it would only run on choke. I removed carb and cleaned everything. Still the same thing. I replaced with a new carb, plug, and fuel line. It runs better with less surging, but still on 3/4 choke. Is there anything I can do?

We are going to need the engine model number information so we can see what you are looking at.

Poulan Pro 624 ES 961920037-00

Engine is LCT 208

Okay need the engine numbers.

Going to a long number like PW4HK18650178EABGIOQUVX5E1M or similar Alpha-numeric seq. in order to look-up the right carb.

Looks like LCT 03122 for the carb part number

Thank you - Yes - That is the replacement I used. Still will only run good on 3/4 choke. No surging anymore.

IL your eyes are better than mine as it took a lot longer to translate that dot matrix number set.

PW2HK18650178EABGIOQUVX5E1M​

bk10s said:

Hello All - A friend moved south and gave me this beautiful, hardly used unit. It has never run quite right. The rpm would surge up and down and it would only run on choke. I removed carb and cleaned everything. Still the same thing. I replaced with a new carb, plug, and fuel line. It runs better with less surging, but still on 3/4 choke. Is there anything I can do?

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After you replaced carb, did you reset govener?

Reset the governor.....Never heard of that! How do I do it? There is no more surging, but it will still only run right on 3/4 choke.

Have you tried to adjust the mixture screws? Running lean.

No adjustment screws on this carb

On other engines, I have opened the main jet, a little at a time, with micro drills until it ran correctly. Go a small amount to see if it affects the richness.

Could a partially clogged exhaust cause the problem???

Poodlehead said:

Could a partially clogged exhaust cause the problem???

Click to expand...

Didn't think about that, but I'll check it out. Also going to find my micro bits. Thank you -

pretty cheap on Amazon, use them with a pin vise. This is the set I have. It's easier to find drill size. Just slide the jet down on bits. https://www.amazon.com/Storage-High...4234&sprefix=micro+drills,aps,147&sr=8-7&th=1

So is there a fuel cutoff valve and does it operate smoothly and a filter did you replace it, look in the tank for any rust or trash and if the screen strainer is clogged by any type of dried additive or ETC.
Most of these no set carbs are close enough to run good without any help, BUT in getting shipped and banged around the tab on the float can be bent, I would check the float tab to see if the float sits level when the bowl should be full but not above the vent.

There is a fuel cutoff valve. Fuel was running out of the new fuel line pretty well, but I'll check it out.

You may just need to pull the plug out of the bowl and see if any trash comes out if that doesn't do it check the float setting and see of there is any trash of any kind in there, anything can restrict fuel flow in a carb if it gets in the right place, I once had a Holley in in a three set that would not flow in one booster correctly, it turned out to be a piece of an o ring from a float adjusting port that I had changed partially blocking the jet orfice.

It's your carb, it either still has crap in it or an air leak at the base gasket.
Does it have a fuel pump, if so it could be restricting fuel.
How about checking the float level also, all this could be the problem, it doesn't matter what carb you have a carb is a carb.
Don't buy a new Chinese carb they don't work.
Take the carb to a reputable mower shop and have them clean and install a kit. This will save you a lot of headaches.
Don't go drilling jets it ran fine for many years with what is there, if you drill jets you are just covering up the real problem.

When going through everything, I installed one of those red fuel filters in the new fuel line. Could that be the problem?

The red filters are for gravity fed fuel systems. I, personally, install the white\clear paper filters on all engines I work on. Both gravity and fuel pump operated. Never had a fuel related problem since.