310-8 with M10s Kohler engine issue ?

[Cape Codder 5]

This machine was running great until I added a little too much oil SAE30 over the weekend. Not much, but after I added the oil and gas it started running real rough. It didn't smoke when I started it but it was over the full line . I needed to remove 6 OZ. to get it back down. Only ran the engine for a minute before I checked the level. I also added the last bit of gas I had. It seems like a carb problem because of the way it 's running but I'm wondering if I did any damage. I put a new plug in also to no avail. It will start and run for a minute or 2 before getting rough. I tried cutting the lawn but it had no balls (rpm) at all. Any thoughts ?

[953 nut 55,229]

36 minutes ago, Cape Codder said:

I also added the last bit of gas I had

If you are using gas with ethanol in it that is probably the problem. The ethanol will ruin a fuel system and if it sits around in a nearly empty container it can absorb moisture from the air.

Only use ethanol-free gas!   Here is a site that will help you find it in your area.  https://www.pure-gas.org/

[Achto 27,576]

 

I had the same thought that maybe the gas that you added was bad.

[peter lena 8,627]

@Cape Codder   old stored gas , as well as tank condition / debris  usually ends up in the carb bowl , easy to check  / clean , don,t know what your  unit has for condition .  like to run a questionable engine on a seperate   gallon of  heavily treated gas . never run my tanks low / empty , always top off after use , add STA BIL  fuel storage , to all my gas . no issues . you could easily have collective failed fuel line set up , have any fuel filters on that ?  have 2 on  my horses , larger one ,close to tank , smaller one close to carb . hard to pin point a fix , might also have other issues ?  might also have a tank fuel cap , with poor venting , that starves fuel . hope you find it , pete  

[Cape Codder 5]

Thanks guys.

[peter lena 8,627]

@Cape Codder   have found that repetitive problems show you the way , that fuel system issue , is probably a  fuel line decomposing from the inside , your fuel bowl , easy drop , might be loaded with debris , good time to change it out , your carb jetting could also be  loaded with tiny bits . BTW  when I change oil , my initial  drainage is hot from running , for a more thorough drainage . then  just figure about 2 qts , to check , probably add just a bit more , also check your transmission dip stick , ever flush that out ? new shift boot ?  let us know how you make out , good luck , pete

[wallfish 17,000]

Yup, probably had some water in the bottom of the container.

An extra 6 OZ of oil ain't the issue

[kpinnc 12,060]

3 hours ago, peter lena said:

your fuel bowl , easy drop , might be loaded with debris

 

Always a good idea when these engines begin to sputter and act up. Plastic fuel tanks always sweat, so it's a good idea to regularly do this. 

 

Also, 6 ounces of extra oil in a splash lube engine won't harm anything. When using on steep inclines, we sometimes overfill a little on purpose to prevent oil starvation.