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I have a 2 year old Toro with a Toro Labeled Motor, I think it's Briggs, 24.5 HP, v twin. I had put some gas with water in it, and obviously quickly quit running. Once I figured out the problem and drained the gas out, and put new fresh gas in, the engine has one cylinder dead. The plug is very wet and not firing. Lots of blue smoke coming out of engine, I've swapped plugs, then coil, adjusted valves, removed the kill switch wires, problem persists in the same cylinder, I followed up with compression test, which was slightly over 100 for each cylinder. It runs with the bad cylinder plug wire off, but not with the good cylinder off. I've read some people have had similar problems and changed carburetor and it fixed it. I really can't see the carburetor being the problem, this doesn't have many hours on it. Any suggestions on what I might check?

no model number, no serial hard to troubleshoot since I can't see it from here. If it has two carbs, drain the fuel from the one on the cylinder that isn't running. Pull the plug and blow some compressed air into that cylinder to dry it out if you have clean air from a compressor.

This is what it looks like, just one carb. Sorry looked in owners manual to find more info on motor, doesn't get any details on who made this motor. My guess is some of you will know this engine by looking at it.

With a fresh plug in the bad cylinder an the kill wires off the coils spray a SHORT shot of carb cleaner down the plug hole & crank the engine
If the valves can close & the timing is good & the coil is good it should fire a couple of times .
If it does repeat with the kill wire connected

Let us know what happens

NB No need to put the blower housing back on for this

Model number off the mower would help and that engine is one built for Toro and is not a Briggs.

Here’s the service manual for that engine. https://www.toro.com/getpub/117255

Your engine was made for Toro in Lonchin, china....They seem to be pretty good, I have read.

The water in the gas, I wonder if you hydro locked 1 cylinder.. The not running with plug off good cylinder indicates to me at least, the other cylinder is dead.

StarTech said:

Model number off the mower would help and that engine is one built for Toro and is not a Briggs.

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Model 75755 purchased 2 years ago. Thank you.

Don't you have 3 year warranty ?

7394 said:

Your engine was made for Toro in Lonchin, china....They seem to be pretty good, I have read.

The water in the gas, I wonder if you hydro locked 1 cylinder.. The not running with plug off good cylinder indicates to me at least, the other cylinder is dead.

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If it hydro locked would it still have good compression? You think like broke a ring or piston?

7394 said:

Don't you have 3 year warranty ?

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Yes

7394 said:

Don't you have 3 year warranty ?

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As has been done to death receintly
Owner abuse like using fuel that has water in it is not a warranty claim item
It is not Tor's or Loncin's fault it is nanogiant's fault

was the water in the fuel a result of washing the engine off?

I had put some gas with water in it,

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First sentence of the opening post

It is a two barrel carb. the dead cyl. side could be stopped up. take the air filter off and start it up and shoot a shot of carb cleaner in the barrels one at a time and see if that changes things. I would get me a can of sea foam and treat the fuel. I would also get a can of seafoam deep creep it is a spray and take the fuel filter loose drain in and spray it full of the deep creep. If it is a water issue it will pull the water right out of the fuel and you will not have to take the carb off to clean it to get the water out.

bertsmobile1 said:

As has been done to death receintly
Owner abuse like using fuel that has water in it is not a warranty claim item
It is not Tor's or Loncin's fault it is nanogiant's fault

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Agree I didn’t think it was fair to expect warranty to cover it. At least if it was a result of the water.

hlw49 said:

It is a two barrel carb. the dead cyl. side could be stopped up. take the air filter off and start it up and shoot a shot of carb cleaner in the barrels one at a time and see if that changes things. I would get me a can of sea foam and treat the fuel. I would also get a can of seafoam deep creep it is a spray and take the fuel filter loose drain in and spray it full of the deep creep. If it is a water issue it will pull the water right out of the fuel and you will not have to take the carb off to clean it to get the water out.

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I will give that a shot! Thank you

Are you power washing the mower?

slomo said:

Are you power washing the mower?

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Usually just wash with garden hose. I know where the water came from, if that's where you're going. I had a 55 Gallon drum with non ethanol fuel I use for my small engines, I had recently pumped out some to fill my 5gallon containers. The first 5 gallon container was the one I put in the mower, it had about a quart of water I could see after I drained out the gas in the mower. evidently the cap on the barrel at some point wasn't sealed tight and some water got in.

What really bothers me is the amount of smoke coming out when I run it, I'm afraid of harming the engine running it that way even for a short time.

I would stick to a leaf blower or shop air if I were you. Water as you are experiencing now causes too many issues.

Check fuel pump pulse line for anything but air. Also the vent should be clear.

Remove carb bowl, crank engine and drain into a glass jar. Check for any remaining water. Will also verify fuel pump is working.

Also pull the oil dipstick and smell for fuel.

nanoGiant said:

Agree I didn’t think it was fair to expect warranty to cover it. At least if it was a result of the water.

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I didn't either, was just curious about the history, since the warranty is NOT transferable to a 2nd owner,..

Does anyone know what the compression should be on the Loncin 24.5 HP engine should be. Didn't see that spec, in the service manual. I'm getting roughly 100 in each cylinder. Also as an update, both cylinders are firing, but it won't get full rpm, and blowing black smoke. Running rough. I'm leaning toward the possibility of hydro-lock as someone earlier mentioned.

check the choke to see if it is opening when the engine is warm. Make sure the air filter is clean.

sgkent said:

check the choke to see if it is opening when the engine is warm. Make sure the air filter is clean.

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Yea, the choke is manual, and I did check that, because that is exactly what it's acting like. One thing I did notice, when it's running if I pull off the fuel line from the pump to the carb, I would expect to see gas pumping out, but none is coming out, obviously it's getting fuel. Why would it not pump gas out when that fuel line if pulled from the carb?