Some years ago my John Deer lt155 was acting up. The dealer thought he had fixed but it turned out it was the ignition coil. New Coil problem resolved. Check the connection in the ignition circuit, Make sure all parts. Check all connection for corrosion and if clear make sure they are tight.

Like it, I will check that out. I'd rather that than the carb for sure. The plan keeps being; soon, tomorrow, this weekend, etc. ha ha. I'll keep you guys filled in. Thank you !

You said you checked the fuel side, but didn't mention if you did the air side. If you have a clogged air intake or filter, or a cracked intake case or gaskets, that could also cause rough running.

Thank you. The air filter seems pretty clean, I take it out pretty regularly, but for the cost of it, I may just pick one up. I'm digging in now about the other possibilities you and KR mentioned. THANK YOU.

Try putting a couple of tablespoons of STP in the fuel. Use engine starter spray and give one good spray on the air filter.

Kevin and Kim thank you. I’ll give that a shot. This weekend I took it apart and inspected coils and the wiring from them to the plugs. I had some heat issues in there a while ago so iI was hoping one of those cables got damaged after someone mentioned the coils. I also checked the fuel lines and they look pretty clear from what I was willing to inspect.

And you’re right-as close as iI got to the carb I don’t want to take that out unless I really need to.

Hey folks,

ok, so iI took this apart down to the barn carb in hand but didn’t take the carb apart. I tried most of what we discussed here and I’m coming up frustrated. Here’s where I’m at. I put it all back together and cut the front lawn, Was still running poorly but running. Suddenly the RPMs went way the heck up, crazy high. I figured I messed up one of the linkages. Sure enough when i pushed it back to garage the linkage in the right (throttle linkage) came off. I popped it back on. But still after i popped it on the RPMs are crazy high.

What the heck did I do!?

Buy the Mechanic in a Bottle like shown in the video. Follow the instructions. Should make it run great after you solve the throttle linkage. Always take pictures before your take something apart.

Hey folks, Happy Memorial Day!

I'm close to being ready to throw this off a mountain, or pay someone to fix it.

I think there is a linkage problem, but this is weird.

I have been trying to find a youtube video of a closeup of the carb linkages and springs, and for as much as I have done so, I can't find anything that discusses some of what I suspect as being the problem.

To recall this whole situation;

Running crappy, followed most of what you guys suggested, although I regret that I did not buy the "mechanic in a bottle". I watched the video a second time later and realized it was a product It may be that if I did that to begin with, all would have been set long ago.

Anyway, so I had it all apart down to the carb, but I did not take it off. Started it back up and it still had the same problem, but I was able to take about an hour and cut 1/2 of my lawn.

After an hour suddenly the RPM's wemt to about 9999, crazy.

Bought and installed an Amazon carb.

The choke link on the left is fine.

The throttle link on the right is seemingly in properly, it moves up and down when I move it manually while being connected to the carb as well as the mechanism on the bottom.

HOWEVER! when the throttle is moved, the cable that this dudes right forefinger is on does not move at all. The throttle cable which would be under his left hand to the right a bit moves with the throttle. The round gear moves freely when the throttle is moved.

When I choke it, the link to the left does seem to work. It pulls up a bit.I don't like how the plastic locking mechanism to too close to the head on the bolt right there.

The only way this started was after I manually pushed up the throttle, BUT, when it did start, the RPM's again were so high that I had to shut it off right away.

I do not know if the fact that I messed with the carb manually had anything to do with it starting. Just a theory.

Last thing, when it seemed to first get this problem as I was mowing my lawn....the throttle linkage came off. I saw that and figured that was the problem, but after I put it back, same issue.

I just watched this video where I snagged this picture from, it seems the tension on that spring determines the RPM level. I may mess with that tomorrow.

This is not as exciting as a Youtube video but I can usually can solve my problems using it. You may need to explorer a little to get the carburetor schematics.

https://partscatalog.deere.com/jdrc/navigation/equipment/22239

More specific

https://partscatalog.deere.com/jdrc/sidebyside/equipment/22239/referrer/navigation/pgId/179482

InOn it as soon as iI get home I’ll update you

THANK YOU!!

Hey folks, After working on this for too long of a while I am deciding to give up. I installed a new carb and the thing still races like crazy. I should have realized this sooner but when the RPM's first took off, I was using the machine and it was running fine. Ever since then I have been chasing this thing, much with your help, for which I thank you.

The person at the local power equipment business seems to think that the governot is shot internally. I don't have time for that. So now the decision is whether to buy used or new. I see an Ariens and a Husqvarna , I welcome opinions! Thanks again to all of you. I may be reaching out if I take one of these machines for real cheap with problems.