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could or the breather could be plugged or head gasket leaking combustion into the oil passage.

based on the choking, unless there is residual water, which I doubt based on your attention to detail, it is probably something like a valve wobbling around, or perhaps a bad plug or wire. If a new known good plug doesn't solve it, the only thing I can think of is maybe widen or narrow the spark...

A lean misfire can be a mixture that is right on the edge of being lean so any deviation leaner can cause a random misfire. I'd use the choke or my hands to richen the mixture and see if anything changes. That and the new plug will pretty much eliminate fuel and ignition as a source of the misfire.

https://www.walbro.com/wp-content/uploads/2017/05/Walbro_Float_Carburetors_DS_EN.pdf

try replacing it with a known good used spark plug since the guy put his own in, unless he will pay for a new one. There are so many counterfeits out there now it is unreal. They can check fine out of the engine, but under compression they can fail. The problem sounds like a lean misfire. and...

if it is two cycle don't forget the oil if it uses a 2 cycle mix.

check the oil level, and for gas in the oil

wiring replacement after a fire or overcurrent melt is about the worst job out there. I excel at finding and fixing electrical and electronic problems, however when I was a mechanic that is one job I always turned down. Guys would take it, then spend a week or more fixing wires, and the...

I usually use a loop of wire around any spring that I can't pull with vise grips or some kind of spring puller like auto drum brakes take.

Unless the spark plug was from a known good source, I'd try another. Then I would blow the cylinder out with compressed air to dry it. put a thimble full of fuel in it, and try again to see what it does.

FYI - regular simple green will dissolve some carbs. The HD Metal Safe version doesn't do that. Home Depot is the easiest place to get it. Our local Lowes did not have it the last few times I looked for it there.

there was a youtube on it recently. The new caps lack the hole. It has to be in a certain spot to stop gas from sloshing out. Starts about 5 minutes

set it into the fluid in a way that the air can get out. Use "Simple Green Pro HD SAFE FOR METALS" with hot water and you will get metal safe results. I spent considerable time finding something that is 100% safe 100% of the time for aluminum and carb metal. Everything else has potential to...

most lead acid batteries are degraded enough by 4 years to replace them. Some people consider 50 - 60% life left good. Others replace them at that point. Some consider them good until they don't work. The next door neighbor has a Toro recycler with electric start. His only charges when the...

did you check the three lines to be sure they are on the correct nipple?

I don't own one but have had the 3 hose style on other engines that used a ZAMA type carb. Here is what Google AI says about hooking the 3 lines up on the K770. Beware that AI makes up stuff sometimes.

Does the carb have 3 lines on it? Main fuel inlet, primer return, and carb to primer suction? If so make sure they are all going to the correct place.

did you go with a generic carb or the manufacturer's part? Does the behavior change when it is choked?

probably falls on deaf ears since he has not been back, but discharging grass out a chute takes air coming in to carry it out. If the cut is too low or the grass too dense, and air isn't coming in then the cut grass isn't going out. Add to it heavy grass from either the density or moisture...

batteries often show reasonable voltage but if a cell is weak, it will drop way down under load. Of course there can be a dirty connection or ground somewhere too. The only way to confirm it is not the battery is to put a voltage meter on it and leave it there while cranking. Then if it falls to...

https://www.searspartsdirect.com/manual/3kv37v4b2s-000247/craftsman-917288210-front-engine-lawn-tractor-parts Never owned one but I'd start by looking over the manual including adjustments. It appears there are two clutch mechanisms. One for the mower and one for the blades.

this owner manual also came up https://images.webfronts.com/cache/frraqswigutm.pdf

match what was there originally, making sure the holes and cutouts align. I spent two days once trying to get an Opel GT running right again after rebuilding a solex where the replacement gasket had a small hole that was not in the original. Fortunately I kept the original gaskets and we were...

googling the model number it led to a 1994 11HP MTD tractor made by MTD sold under different names including Yardman. Attempts to get to a manual from MTD kept giving me errors, and Archive.org says page not in their system. I was able to find a German copy at...

that mower appears to have been sold under many names and variants over the years from the late 1980's until about 2000, including some different ones in Europe. Should be a manual out there that specifies the belt length. Specs say engines were 8hp to 12hp depending on which model. Some of...

was the throttle open when you tested for compression? And, where did you buy spark plug?

a search with Google Lens brings up a similar tractor made by MTD and sold by many names. Without a picture of the "variable pulley" it is hard to match it, but this is one pulley shown in a 1994 model. It is sold by different names too in Europe. https://www.ebay.com/itm/285518013224 One can...

we have multiple engine models in this thread. Specifically 1998 Briggs & Stratton engine model 12F702, and 1781F1, code: 98081758. To get correct answers the best thing would be to correctly list the model, submodel, and serial then verify it before hitting post. It should be something like...

Google AI answers as follows Poor maintenance 800 - 1200 hours Average Commercial use - 1500 to 2000 hours Exceptional care maintained like new 3000 - 4500 hours because oem parts usually work the best and even those can be inferior to a part made pre-covid, and the high cost of those parts...

a query online gave multiple causes. Worn bearings in the double stack pulley was most common. It says that pulley and bearing wears fastest because it has two belts tugging at it. If it wobbles or has any tilt that will set up a vibration that tosses the belt. The tensioner idler arm bushing...

if the tank cap is a common size and thread, you might be able to find a universal that sits in the tank. Depends how deep the tank is too. Or carry around a gas can, or strap a second smaller universal tank to it and use a two way valve to use it as a reserve when the main tank runs out...

pete - i put my head to the computer screen hoping it would tell me exactly what "doesn't work right" means, but nothing happened. Do you think you could be a little more specific about what is wrong? A needle is pretty basic. Before you start you slowly turn it in gently counting how many turns...

I tried that approach and it made for a poor reinstallation. Had to do the job twice and the cover is tweaked now. Would have been quicker and easier to just remove the engine.

I have a somewhat similar edger. The cover sits under the engine, so the mount bolts pull the engine down onto the air cover. If yours is like mine, yes.

or the fuel put in it has a problem. A friend one time grabbed the kerosene instead of gas. Spent a whole day trying to figure why he recently restored Packard would not run.

engine noises like a piston or rod seizing typically are thunking or knocking. A squeal is high pitched and would not get out of the case. Most likely it is the starter clutch or something external like it threw a belt and the belt is lodged in a way the pto side can't turn.

did you soak the area in Liquid Wrench or PB Blaster, Knock er Loose, etc., for 24 hours first?

unless you have an engine that has the kill mechanism that is shared with the choke (and some do), it should not as you said, die on all open or all closed but run in between. Some other engines also have a lever that the throttle goes from kill -> choke -> idle -> run.

we have a 20055 that I just overhauled. It was taking 12 primes and two pulls to start cold. Had good compression, etc., just had 20 years of use on it. I cleaned the carb - very simple carb, replaced the o-ring that the carb sits up against, the plastic intake tube, gaskets, and replaced the...

I'd run over to O'Reillys, Napa, Autozone, or maybe your local larger lawn mower shop and buy a new (Probably NGK or Champion RJ19LM) spark plug for that model. Genuine NGK plugs typically have had blue lettering for sometime. The counterfeits have dark gray lettering. Yours has dark gray. You...

scoring is much common on air cooled engines than water cooled. The depth of the scores will depend upon what scored it.

I would make sure that the plug is a genuine one. What happens these days is someone lets a machine like a Mantis sit. It fails to run. They do the easy things first, replace the spark plug, replace or clean the air filter, replace the fuel. It still doesn't run. Then they replace the carb and...

ask yourself how long you will use it on each occasion. Then decide whether to go ev or gas. We have both. The ev does blow more, but the battery and motor will overheat and shut off for safety reasons if we use it more than 4 or 5 minutes on the highest settings. The gas one requires draining...

does the air cleaner have a breather in it that could be spewing lots of blowby, oil or water vapor?

carbon deposits and getting hot.

Don't assume that it is held in by threads and rust, although it probably is because you have already tried an extractor. The shaft and the head may have been the issue, and now that they are gone, with a little PENETRATING oil and not WD40 which is mostly solvent, and a light punch or chisel it...

sometimes people clean the old plug with a wire brush and try to reuse it. Wire brushes will leave some of themselves in the porcelain insulator, and sometimes short out the plug. Use a glass bead blaster, walnut blaster etc., to clean the tip of a spark plug, and avoid hitting the threads. Or...

now you know the problem is that the left side is weak. One of three is missing on that cylinder - air/fuel, spark, or compression.

you said you tried new fuel. Did you drain the tank, and the carb, then try new fuel? If there is old fuel in the bowl, new fuel in the tank doesn't help a lot.

can be the fuel cap is not venting, or the tank outlet is plugged and letting it sit for a few seconds the carb fills back up. It can also be a wire that is killing the spark and the act of shaking the engine when pulling the cord moves the wire that it runs until it shorts out again. It can be...