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I was working on a genereac power washer that belongs to my boss. He said it sat for at least a year (maybe more). The fuel tank was empty and the oil was way overfull and smelled like old fuel. I checked the compression and got less than 60psi. Could fuel that leaked down through the engine possibly have caused some damage? Sorry I do not have a engine model number but it I can try to get it later today. The model number on the washer was G0069220.

Compression readings on small engines are not of much use on most small engines, as they usually have a compression release of some kind.

Drain it out thoroughly, and fill with fresh oil. Also, put an inline fuel shut offon it,
and shut it off when not in use.

If it floods badly when fresh gas is put in, go through the carb and replace parts as needed.

Like a bad float, or leaky needle.

You can try to put oil in cylinder and have compression test again. If any change, ring/cylinder can be worn.
If no it can be as said before, compression release - but we need to know engine model to know that. Be sure that chock is not closed and WOT position (but this should not change the world on a small engine...)

Fish explained you all, for sure gas in fuel will do accelerated war / damage in the engine. You should change oil asap and fix the fuel leak

If it hasn't been run with the high gas contaminated oil, I would say the cylinder walls and rings are fine. Cannot go by compression readings on a compression release engine. I did a test on a customers generator that wouldn't start last fall and the leakdown test showed less than 10% leakage, but the compression only showed 5 psi. Engine had a clogged muffler issue is the reason it wouldn't run.

Thank you everyone for your help. I have already emptied out the oil and put fresh oil in it. There was also already an inline on/off valve for the fuel, and it had been left open.
The engine model number is ST168F-2-A7.
I'm thinking the next step now is to just open the carb and repair or replace. I removed the little plug at the bottom of the bowl to drain any leftover gas and there was definitely some stuff caked up on the end of it.

On Generac the engine parts diagram is normally part of the diagram for the equipment parts diagram, So you may need to get the numbers off of the equipment model tag which is a lot of cases is on the lower part of the blower housing on the engine. Will normally start with 00 but some of the newer models can also start with a G with a bunch of numbers behind it.

If I'm not making a mistake, 168F-2 is a Chinese clone of Honda GX200... but I don't know Generac (not a brand in my country).

All GX engines (and clones) have a decompression mechanism
https://www.bmikarts.com/Stock-Camshaft-for-Honda-GX200-65HP-Clone-Engine_p_24.html

So 60SPI is perhaps not real - and you engine is good.

Mkala said:

If I'm not making a mistake, 168F-2 is a Chinese clone of Honda GX200... but I don't know Generac (not a brand in my country).

All GX engines (and clones) have a decompression mechanism
https://www.bmikarts.com/Stock-Camshaft-for-Honda-GX200-65HP-Clone-Engine_p_24.html

So 60SPI is perhaps not real - and you engine is good.

Click to expand...

Mkala ..... Generac makes generators also....... Plus they make their own engine here in the states.............

Generac list 60 psi as the minimum compression using a screw in automotive compression gauge per the service manual.

I believe the single cylinder engines used on Generac equipment are made my Loncin, but they are branded as Generac engines, and all parts and other information is from Generac. Generac manufacturers the twin cylinder engines on the over 10K portable generators

Mkala said:

If I'm not making a mistake, 168F-2 is a Chinese clone of Honda GX200... but I don't know Generac (not a brand in my country).

All GX engines (and clones) have a decompression mechanism
https://www.bmikarts.com/Stock-Camshaft-for-Honda-GX200-65HP-Clone-Engine_p_24.html

So 60SPI is perhaps not real - and you engine is good.

Click to expand...

You know, It looks just like a small Honda engine. It doesn't say Honda on it anywhere though. I hope that at least makes it easier to get parts if needed.

ILENGINE said:

Generac list 60 psi as the minimum compression using a screw in automotive compression gauge per the service manual.

I believe the single cylinder engines used on Generac equipment are made my Loncin, but they are branded as Generac engines, and all parts and other information is from Generac. Generac manufacturers the twin cylinder engines on the over 10K portable generators

Click to expand...

The compression was about 58-59. Do you think that'll still be good? I'm going over tomorrow to open up the carb and do a cleaning.

I wouldn't worry about the compression readings, just drain the oil, clean the carb, make sure it isn't leaking past the float needle, and start it up. Generac doesn't offer parts for the carbs, or are very limited, so if anything goes wrong with a gasket options may be limited at that point.

ILENGINE said:

Generac list 60 psi as the minimum compression using a screw in automotive compression gauge per the service manual.

I believe the single cylinder engines used on Generac equipment are made my Loncin, but they are branded as Generac engines, and all parts and other information is from Generac. Generac manufacturers the twin cylinder engines on the over 10K portable generators

Click to expand...

Thanks for pointing that out to me about the engines ....... I had contacted Generac a couple years ago and the Nice sales lady assured me their engines were made here .......

She is a sales lady of course and didn't know better, just what she is told to say......

BUT she did get my parts to me though ...... I always thought they were made in Japan, which Vanguards were made there also, and I would rather a Japan built over china built IMHO.....

Briggs did have QC for their engines there.........

BTW we have had 3 break ins in our big shop within the last 6 months........ 2 times here in the last 2 weeks........ They were looking for guns in the gun shop part of our shop....

Next time the alarm goes off we won't wait on the deputy to show up..... We are gonna be there first and when they come out or attempt to come out they are gonna stay inside the shop with a lil 45 help from us.....

Nope we not gonna kill them we just gonna hold them there till the law shows up....





Plus Tard Mon Ami ~!~!

Boudreaux In Eunice La. said:

BTW we have had 3 break ins in our big shop within the last 6 months........ 2 times here in the last 2 weeks........ They were looking for guns in the gun shop part of our shop....

Next time the alarm goes off we won't wait on the deputy to show up..... We are gonna be there first and when they come out or attempt to come out they are gonna stay inside the shop with a lil 45 help from us.....

Nope we not gonna kill them we just gonna hold them there till the law shows up....





Plus Tard Mon Ami ~!~!

Click to expand...

That escaleted quickly...

I got the pressure washer running. The gasket between the carb and the air filter housing was a little deformed and there was a little corrosion in the carb, and I can only get it running with the. Choke half on but it's working. They want me to pressuread wash their brick steps now, I'm wondering, how bad is it for the motor if I have it running like this? I'm think for a full fix, maybe a new carb and gaskets.

Boudreaux In Eunice La. said:

BTW we have had 3 break ins in our big shop within the last 6 months........ 2 times here in the last 2 weeks........ They were looking for guns in the gun shop part of our shop....

Next time the alarm goes off we won't wait on the deputy to show up..... We are gonna be there first and when they come out or attempt to come out they are gonna stay inside the shop with a lil 45 help from us.....

Nope we not gonna kill them we just gonna hold them there till the law shows up....





Plus Tard Mon Ami ~!~!

Click to expand...

BTW, they sound really stupid given that they are trying to steal guns out of your shop, so be careful!

SHOESNSOCKS said:

You know, It looks just like a small Honda engine. It doesn't say Honda on it anywhere though. I hope that at least makes it easier to get parts if needed.

Click to expand...

Looks like... it's why they are called clones (or Clonda or Chonda). A lot of part (if not almost all) are interchangeable. I don't say they are same quality by the way.... but you have the full range choice (price, quality) from cheapest (unknown brands) - not bad (Loncin, I hope these Generac ?) - to the original (Honda GX).

SHOESNSOCKS said:

That escaleted quickly...

I got the pressure washer running. The gasket between the carb and the air filter housing was a little deformed and there was a little corrosion in the carb, and I can only get it running with the. Choke half on but it's working. They want me to pressuread wash their brick steps now, I'm wondering, how bad is it for the motor if I have it running like this? I'm think for a full fix, maybe a new carb and gaskets.

Click to expand...

This mean your are too lean, so dirt in the carb. You should clean it all the way to have the engine running good.
To test or in case of emergency you ca run with half-choke, but on long term this mean you have to the right mixture on you will have issues (lack of power, carbon build up, ...)

SHOESNSOCKS said:

That escaleted quickly...

I got the pressure washer running. The gasket between the carb and the air filter housing was a little deformed and there was a little corrosion in the carb, and I can only get it running with the. Choke half on but it's working. They want me to pressuread wash their brick steps now, I'm wondering, how bad is it for the motor if I have it running like this? I'm think for a full fix, maybe a new carb and gaskets.

Click to expand...

Your carb is still a lil dirty or the UN METERED air is too much from the bad gasket on the intake...............

Yes they are stupid for multiple break ins.......... They gonna feel worse than stupid next time they try it........

Plus Tard Mon Ami ~!~!