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the voltage a spark plug gapped to .026" fires outside the cylinder in ambient air pressure is usually between 2,500 volts and 3,500 volts. At 125 PSI, the firing voltage needed is between 18,000 volts and 20,000 volts. A spark plug sparking at room pressure does not necessarily fire in the...

yes - what spring? was this one that rotted away, or was it one that was an attempt to solve something else? a cylinder that needs to be choked, or one that is choked and doesn't need it won't run well. I would spray a mist of water, or use an infrared temp gun on both exhausts when it is...

check all the wires for chafing / wearing thru to the frame etc., or mice damage.

thumbs up. Thanks for sharing the outcome.

add up what it might cost to fix it up, then look thru your facebook marketplace to see what is for sale, and why it is being sold. Sometimes people have nothing wrong with their mower but they elect to go electric - and almost give away a good gas mower. Look for an aluminum rear wheel drive...

Google has this answer:

read up on it first, and look at some youtubes. It is really easy but also easy to get confused

try another Lowes. Sometimes in retail the manager gets a bonus based on store performance and bottom line. I've seen it where one retail store refuses to warranty something because they don't want to eat the loss.

that would lead me to believe you have a vacuum leak or plugged jet / needle and seat. I have seen on a rare occasion depending on the ignition wiring, a coil work in the start position but fail in the run position. The symptoms are a bit different in that the engine runs until the key is...

you won't know if you can re-use the gaskets until they are off. Sometimes they are pliable and come off cleanly. Sometimes they are hard or they tear. Buy a set before you begin or plan on waiting for them before you can put the covers back on. Then if you can re-use them you will be pleasantly...

AI analysis: Production Details Year of Manufacture: 1994 (Determined by adding 70 to the first two digits of your serial number: 24 + 70 = 94). Day of Manufacture: 157th day of the year (Digits 3, 4, and 5 of the serial number), which corresponds to June 6, 1994. Factory Designation: This...

If #21 was always missing you might ask the person you bought it from if they have seen it lying around.

any place that air can get into the intake system, can affect mixture. That includes blown head gaskets and cracked intake manifolds. Exhausts can get plugged too. Valves can stick open and allow air in that affects mixture. Use a infrared temp gun on the exhaust to see if both sides are...

https://www.ebay.com/itm/178443263545?_skw=7037334&itmmeta=01M15D5FD7WC0DNDBDR0KMS483&hash=item298c0c1e39:g:1M0AAeSww99qj2E8&itmprp=enc%3AAQALAAAAwGfYFPkwiKCW4ZNSs2u11xAPstFZDnhfO5L7i40FrVmMuq1d%2BFMLPdgqFZe1fqG5A2j1zf0YPekj11LltP4dFY9Y%2Bny%2BT%2BFSIUPE0VZ1QyOTQLYUUNanKWYyJvDx6IrJJ5087zXUgwFjBHs...

just relying on the image looks like that is the detent mechanism that holds the shift fork in different positions/gears/whatever that shift fork changes. Beyond that not a clue whether it was there or it got lost while apart. If you can't find it, you'll probably have to call or go see your...

anytime something dies immediately after fuel is added, the problem is usually fuel. Kerosene can empty? Water in the fuel?

Exmark 126-3949 is on fuel tank assembly page. $180 - $225 depending where purchased from. Better make sure a mouse did not chew a wire. Looking at the pictorial, be pretty hard to not see the top and wires coming out of the top of the fuel tank. Also, when these type things go bad it is...

ask yourself why the pushrod broke. Was the governor messed with when the pushrod was replaced.

might want to leave it off for a few seconds after it dies, and measure the coil kill wire to ground to see if it is the coil kill wire killing it, or the load.

there is a huge difference between a well maintained piece of equipment that needs repair, and something that has been allowed to corrode into a solid piece of rust. The issue is labor. If it is your own machine, and you don't mind spending the time as a hobby to get out of the house, it works...

might get an inexpensive oscilloscope and throw it into the circuit to see if they system is producing AC. Charging voltage can be right but a bad diode may be passing AC.

especially on a mower that probably should be at the end of its life and sent to salvage to part out.

send us a link to the carb you bought, or post photos. Lots of times on these replacements you need to figure out where the existing carb idle jet is, then figure out the size, compare it and then redrill the one in the new carb, or if it unscrews, swap it. Very few carbs made today have...

If you meant engine not turning when you tried to crank it, you need to check battery voltage with the ignition in the run position and the headlights on. Fuel supply would have zero to do with not cranking. However if you meant it would not catch when turned, that could be fuel. Make sure...

Tell the client that you really want his business, and to help him so he doesn't feel snubbed, and change the quote to an hourly rate including the time it takes to find parts. Let him spend his time finding the parts. It is not your fault the system is a problem. Document it. Most states...

I looked online out of curiosity after reading this thread from the beginning when it began. The parts diagram shows conventional hoses, clamps and a selector valve etc.. Also one that uses an elbow and a grommet. As for the shop vac, it sounds like you don't have access to a compressor. If...

If I had the answer to your question I would have shared it. Did the best I could. Yes, people who help others on forums like this have a hard time finding people with answers to their questions. There are a couple forums I am on where 99% of questions I have are either never answered or are...

might want to price out a new mower. But, that said, I just rebuilt a toro mower that cost me near as much as a new mower. The irony is last night we watched a podcast of a guy who collects free mowers and works on them. He had two slightly later models than ours he picked up for free. All that...

not a clue but maybe this might help https://www.mcmaster.com/products/o-rings/

sounds like you are close. There are tach programs for a smart phone.

one cylinder or two? If both died, I would try spraying a little berrymans b12 into carb to see what that does. If the engine spins properly, it is a dual cylinder engine, and both cylinders are dead, then it has to be something common to both. That probably rules out spark and compression...

compare the length of the old belt to new one. If your mower has a brake shoe that hits a pulley to stop the blades when you disengage, make sure that it isn't worn. As they wear it allows the pulley to move in a way that reduces tension and that can cause belt problems. Plenty of youtube...

just remember - three things to run - fuel/air, spark/timing, and compression. One is missing. If it isn't bad fuel, can you tell us regarding the parts you bought - was the carb OEM or was it aftermarket?

are you saying that if you apply 12V to the trigger terminal on the starter solenoid it will turn over and the engine will start? However when you turn the key to start, the starter solenoid does not do anything?

I agree with you. Stupid shows up so many places.

I would suggest checking all the other frame and mounting bolts to be sure they are properly snug. Sometimes when something like this happens, the additional stresses show up in other areas. Because it is a common point of failure, the new parts are designed to solve it. This is also a good...

saw one on a podcast recently. It appeared that the whole engine had gotten really hot at some time from dirt and clippings that built up.

Google AI: Top Smartphone Tachometer Apps SoundTach: Best for vehicles and small engines like motorcycles, dirt bikes, lawn mowers, and chainsaws. You simply point your phone at the exhaust, and it measures engine RPM automatically from the sound without needing wires or OBD adapters. You can...

if it is a plastic manifold, you may have a warp between it and the carb, allowing just enough air in that the idle mixture is affected, or it may be debris in the idle jet.

Very possible - in which case the pieces got between the head and piston. That has the same effect including a damaged rod. The point is there is no happy ending here with a loose wire or dirt in the carb. Engine comes apart and if any pieces hit the cylinders, cam ect, they are toast too.

there is a 3 month old post on facebook for someone named Josh Duke who was looking for one. Might read that thread, it lists 3 dealers who are supposed to have one in stock. https://www.facebook.com/groups/326888798213211/posts/2031528001082607/

drain oil and gas, Replace. Dry off with leaf blower. Place in sun all day. Use motorcycle cable lubricator for best cable lube. Add pressure wash if covered in mud. Lube axles and transmission if you have the time. Don't forget to remove spark plug and spin. Add some atf pr mmo into cylinder...

I don't know because I don't have one, but do the autochoke versions have any springs on them?

there are many spring configurations on the 6.75 hp 120000 series motors. Many are in the Briggs repair book showing those configurations. This is on a Toro vertical mower engine. No idea whether yours is vertical or horizontal. This one is a 125K02-0189-E1

can't say mine moves much more (and its new since I remanufactured my 20 year old Toro with a Briggs and Stratton engine a couple weeks ago) . You need to adjust it properly and see if the problem goes away. The uses that governed engine have don't usually require a variable speed so it doesn't...

The screw is only needed if a cable attaches there. That mount is on many mowers where nothing is mounted to it. It is that way on our mower for 20 years now.

Have you verified that the engine kill wire to the coil(s) is being connected when you turn it off? If you manually ground that wire does it also continue to run on? Both coils need to ground if it is a dual cylinder engine. Carbon deposits in a cylinder on a very lean and hot engine can...

Does it lose power when the blades are not engaged and the RPM is up? Make sure the belt moves freely. If it is binding the amount of power being drained can stall an engine.

where did you get the spark plug? I have seen two youtubes in the last 48 hours where the only thing that was wrong was the prior owner bought a spark plug online and guess what. It was counterfeit and ran the engine poorly. In both cases on general practice the people working on the engine put...

Liquid wrench is what I use. Are you able to heat the steel some without damaging the plastic? I wish there was a picture so those of us who rely on the Internet to advise could see what you are up against. If it looks like this generic wheel in an Internet search, I would use a bearing...