ad, and gave it a oil change. I mowed a couple times around the yard and it just stopped running. I checked the fuel line, the fuel filter is clean. Gas will run to the carberator(sp?). The air filter is clean. I have poured gas into the carb. and it will run, but not for long. I went as far as replacing the spark plug thinking that was the problem, no luck.
I thought this was weird. I can crank the motor over even if I am not on the seat. Is this supposed to happen?
I am not an expert in motors, but I do know enough to be dangerous.
Felling frustrated. Please help.
21 Hp 42″ Deck, Ys 4500 Lawn Tractor

Experienced gardeners share their insights in answering this question :
Hi and welcome to FixYa, I am Kelly.
You have debris in the carb float bowl and it has blocked the fan\in fuel jet in the throat of the carb. These engines came with both Nikki and Walbro carbs on them. They both have the solenoid on the bottom. You have to remove the float bowl and clean out the float bowl AND the jet / orifice that is located in the area where the bowl solenoid is installed. You can clean the orifice most of the time by breaking off a toothpick and using the BLUNT end. What ever you do…. DO NOT poke a toothpick into the hole of the orifice. It will break off and you will be no better off than you are now. Make sure that you clean off the off solenoid plunger and face. You can test the solenoid by applying 12VDC to the positive terminal and grounding the other one. I use the battery of the mower and a short piece of wire is necessary. You should feel it “click” as you apply voltage and the plunger should recede. If you get the polarity wrong you won’t hurt it just reverse the leads. If this solenoid does not work or the plunger is stuck in the extended position the motor will never get any fuel. Once you resolve the debris and / or solenoid problem and your sure the orifice is clean (use carb cleaner also) it should run just fine.
As for the seat switch issue. Either the switch has failed or the switch is out of adjustment. If is up to you if you want to correct the problem. Personally seat switches are a good thing but usually they do the exact opposite of what yours is doing. (I.e. they fail in the open position and it won’t start.) As long as your aware of the dangers of operating it without a functioning safety switch it is no big deal unless you have terrain that has steep slopes and you use the moder there. Also if you have kids that use the mower.. I would probably get it fixed.
Should you need parts you can enter your model number on the http://www.searspartsdirect.com site and find your seat switch there.
If you need more help in the future I will also need your model number. Feel free to ask questions anytime.
Thanks for choosing FixYa,
Kelly

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

1/2 – 1 acre — For a lawn this size, you`ll want a riding lawn mower with a cutting width of up to 42″ and at least a 14 HP engine. 1 – 2 acres — For yards in this size range, a riding lawn mower with a 42″ or 46″ deck and an engine in the 14 – 16 HP is necessary.
1-Acre to 2-Acre Lawn: Look for a mower with a 42-in to 52-in cut width. 2-Acre to 3-Acre Lawn: Look for a mower with a 50-in to 54-in cut width. 3-Acre to 5-Acre Lawn: Look for a mower with a 54-in to 62-in cut width.
The top setting for most mowers gives a cutting height between 3.25 and 4 inches. This is best for your lawn, but at a setting of 4 inches you may sometimes see some “laying-over” of turf blades that some people find undesirable. For this reason, some people prefer to mow at 3 or 3.5 inches.
For most effective results, a lawn mower deck should have a pitch of 1/8-inch to 1/2-inch between the height of the deck rear to the height of the deck front. Naturally, this makes the sweet spot about 1/4-inch of pitch, depending on the type of mower.
For most effective results, a lawn mower deck should have a pitch, or height difference of 1/8-inch to 1/2-inch between the front of the deck to the back of the deck. Naturally, this makes the sweet spot about 1/4-inch of pitch, depending on the mower model.
40V class: about 1.0 to 1.5 horsepower being as optimistic as possible.
(2) Mower Deck Spindle Assembly with Pulleys Fits Craftsman YT4000 YS4500 with 42″ Decks.
This 21-in. push mower is ideal for smaller yards. It is powered by a reliable 140cc Briggs and Stratton engine.
Craftsman 917.27660 YS4500 Specifications & Technical Data (2006-2023)
This 21-in. push mower is ideal for smaller yards. It is powered by a reliable 140cc Briggs and Stratton engine.

Discover Relevant Questions and Answers for Your Specific Issue

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I own a Craftsman YS 4500 lawn mower with a Kohler Courage 20HP model # SV600S. I have owned for 2 years. I just replaced my battery, it was dead, and gave it a oil change. I mowed a couple times around the yard and it just stopped running. I checked the fuel line, the fuel filter is clean. Gas will run to the carberator(sp?). The air filter is clean. I have poured gas into the carb. and it will run, but not for long. I went as far as replacing the spark plug thinking that was the problem, no luck.
I thought this was weird. I can crank the motor over even if I am not on the seat. Is this supposed to happen?
I am not an expert in motors, but I do know enough to be dangerous.
Felling frustrated. Please help.
ANSWER : Hi and welcome to FixYa, I am Kelly.
You have debris in the carb float bowl and it has blocked the fan\in fuel jet in the throat of the carb. These engines came with both Nikki and Walbro carbs on them. They both have the solenoid on the bottom. You have to remove the float bowl and clean out the float bowl AND the jet / orifice that is located in the area where the bowl solenoid is installed. You can clean the orifice most of the time by breaking off a toothpick and using the BLUNT end. What ever you do…. DO NOT poke a toothpick into the hole of the orifice. It will break off and you will be no better off than you are now. Make sure that you clean off the off solenoid plunger and face. You can test the solenoid by applying 12VDC to the positive terminal and grounding the other one. I use the battery of the mower and a short piece of wire is necessary. You should feel it “click” as you apply voltage and the plunger should recede. If you get the polarity wrong you won’t hurt it just reverse the leads. If this solenoid does not work or the plunger is stuck in the extended position the motor will never get any fuel. Once you resolve the debris and / or solenoid problem and your sure the orifice is clean (use carb cleaner also) it should run just fine.
As for the seat switch issue. Either the switch has failed or the switch is out of adjustment. If is up to you if you want to correct the problem. Personally seat switches are a good thing but usually they do the exact opposite of what yours is doing. (I.e. they fail in the open position and it won’t start.) As long as your aware of the dangers of operating it without a functioning safety switch it is no big deal unless you have terrain that has steep slopes and you use the moder there. Also if you have kids that use the mower.. I would probably get it fixed.
Should you need parts you can enter your model number on the http://www.searspartsdirect.com site and find your seat switch there.
If you need more help in the future I will also need your model number. Feel free to ask questions anytime.
Thanks for choosing FixYa,
Kelly

How can I tell if my fuel filter needs to be replaced. My mower the ys 4500 quit running the other day so I figured it was the fuel filter or line but how can I tell if it is the problem
ANSWER : Hello. IF your spark plugs are good, and your air filter is clean, and your fuel tank is not close to empty, the next thing to check is the fuel line and the fuel filter. As a general rule, I change the fuel filter every 40 hours and the fuel line every 200 hours. J.

Lt 1000 quit running while mowing . found fuel filter clogged replaced finished mowing . did another lawn right after no problem next time i used it about a week later made one pass and died replaced fuel solenoid under carb rebuilt carb blew all fuel lines out cleaned tank . same problem exists runns for about 5-10 minutes or one pass on the lawn then dies ?
ANSWER : Check the gas tank cap, there should be a small hole to let air in as the fuel is used. If it’s blocked air cant get in and as fuel is used a partial vacuum forms in the tank, the fuel stops running and the motor dies.

I have a Crafstman Riding mower model #917.273643. That ran fine one second, I shut it off for five minutes. When I went to start it back up it wouldn’t start. Cranks fine, checked the wires, fuse, and spark plug. The plug was dirty so I cleaned it. But I am not getting any spark. I bought a new plug still no spark. I also checked the plug on another motor and I had spark so the plug wasn’t bad. Any suggestions on how to troubleshoot this or what may be wrong?
ANSWER : Sounds like your coil went bad

YARD MACHINE MOWER NOT A YEAR OLD YET AND IT CRUDDIES UP EACH NEW SPARK PLUG AND SMOKES, NOT RUNNING WELL. ITS RUNS REAL FAST AND THEN REAL SLOW, SPUTTERS. I HAVE ALWAYS KEPT AIR FILTER CLEAN AND OIL CHANGED. WHAT COULD BE THE PROBLEM? MY SON THINKS ITS THE RINGS AND SAID I SHOULD TAKE IT BACK TO HOME DEPOT BUT I’VE HAD IT FOR 11 MONTHS. WHAT SHOULD i do??
ANSWER : Return the mower if possible for warranty repair or call MTD with the issue. MTD mowers typically are good quality and should run like new for a long time with proper care. Depot may give you a 1-800 number instead of customer service so before you load up the mower talk to them. It does sound like a bad valve seat or rings either one is not typical wear and tear.

Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.
ANSWER :

My tractor stalls like it is starved for gas although the gas tank is full. I,ve changed the fuel filter and the gas cap. I’ve cleaned out the gas tank, gas lines, and the carburetor bowl. The problem seems more acute when the gas tank is full or near full. At this time to alleviate the problem, I blow through the gas cap and the fuel filter fills with gas and it runs good again. But as soon as the fuel filter has no more gas, of course, it stalls until I blow on the gas cap. As the tank gets down to about 1/3 full, the engine runs OK. What else could cause this condition?
ANSWER : I had a similar problem with a sears tractor. close to the carbarator is a rectangle box with a rubber hose going to the engine block – remove the hose and spray carb cleaner in the hose wait a few mins and try again – its a vacuum for the carb

Craftsman DYS 4500. Mower was running, then stopped. Can’t restart; oil very low
ANSWER : There are cam rods in the front of the engine. Sometimes, one may break. Open the cover to check. Of course keep sufficient oil in the crankcase, but if it stopped while you were running it, I don’t think that is the problem.