new spark plug in twice and it fowels , seems to be back firing out of the carb , . changed all the gasoline out and put in new, have not changed the oil until i get it running. do not have a manuel , need help trouble shooting problem.
Full Suspension Mountain Bike Men

How to Identify and Resolve Common Issues ?

We offer a diverse range of insights on identifying and resolving common problems in sports. Our sources encompass academic articles, blog posts, and personal essays shared by seasoned athletes. :

If no spark appears, check for broken wires, shorts, grounds or a defective stop switch. Once you have confirmed that the stop switch is working, reconnect the spark plug lead.
Finding your model number and serial number is as easy as locating the identification tag on your machine. As seen in the example, the model number will be displayed below the MODEL heading (Example: Z235), and the serial number will be underlined on the top-right corner of the tag (Example: 130002).
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
From the spark plugs to the ignition coils, many different things can cause an engine to misfire. The most common causes of misfires are worn, improperly installed, and mishandled spark plugs, malfunctioning ignition coils, carbon tracking, faulty spark plug wires and vacuum leaks.
To Determine Manufacture Date Based on Serial Number: The 1st three numbers of your serial number will always provide your manufacture date. The 1st number is the YEAR of manufacture; the 2nd & 3rd numbers indicate the MONTH of manufacture. Please see the detailed explanation and examples provided below.
MTD`s current (1997 and later) model and serial numbers are generally 11 characters in length. A character could be a number, dash or a letter. If 0 represented all numbers and/or dashes and X represented all letters, the model and serial numbers should appear as follows: 00XX000X000.
The model number and serial number on your Kawasaki Engine is located at the rear of the engine on the engine housing. The model number and serial number label in the image is located on your. Kawasaki Engine. The CODE number above the barcode is made of the model and the spec number.
Most carburetors have a unique identification number that can be used to confirm its make, model, and specifications. The carburetor number is typically located on a metal tag attached to the carburetor. On most aftermarket carburetors, this ID is stamped or etched directly onto the carburetor body.
Your serial number is located on your engine plate, often located on the left-hand side of the engine. Typically the first letters and numbers will identify the engine, for example, DJ51279, to find all the parts we have online for your engine.
Related Definitions

Model number means a combination of letters, digits, or characters representing the manufacturer, brand, design, or performance of an appliance. Model number means a combination of letters, digits, or characters representing the manufacturer, brand, design, or performance of an appliance.

The engine type code is stamped into the side of the engine, usually close to the serial number. Engine type codes may be up to 4 characters.
A Bad Crankshaft Position Sensor

The crankshaft position sensor monitors the position and rotational speeds of the crankshaft. Without the crank sensor, the engine control module (ECM) wouldn`t know when to fire the fuel injectors and ignite the spark plugs.

A clogged or failed exhaust gas recirculation or crankcase ventilation valve or faulty oxygen sensor can send the wrong signals to the computer and cause misfires.
At its core, an engine misfire occurs when the combustion reaction doesn`t work correctly, and your cylinder remains unfired. Misfires can occur both upon engine startup and even in the middle of engine idling. When a misfire happens, your engine might momentarily stumble, and it may even lose speed (RPMs).
If your riding mower`s e engine runs rough or misfires, the carburetor could be clogged.. Rebuild or replace the carburetor if it`s clogged. If the engine runs rough after hitting a rock or stump, check the flywheel key-a damaged flywheel key will disrupt the ignition timing.
Many factors can cause a spark plug to fail; from incorrect heat ranges to improper gapping, to chemical contamination. Yet 90% of spark plug damage claims are due to improper torque. Many factors can cause a spark plug to fail; from incorrect heat ranges to improper gapping, to chemical contamination.
Repeated overheating of the spark plug tip can cause the plug to prematurely fail. Overheating can be caused by many things like pre-ignition and a malfunctioning cooling system. Pre-ignition can lead to heat building up in the combustion chamber causing the spark plugs to fail.
Failing spark plugs can cause the car engine to misfire and thus affect its performance. A single spark plug that fails to ignite the fuel-air mixture can cause a halt in the running of the engine. It can result in incomplete combustion and damage to the catalytic converter of the car.
Repeated overheating of the spark plug tip can cause the plug to prematurely fail. Overheating can be caused by many things like pre-ignition and a malfunctioning cooling system. Pre-ignition can lead to heat building up in the combustion chamber causing the spark plugs to fail.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

I have a 2004 60 hp yamaha 2 stroke outboard engine that doesn’t start or run well. Once warm and in the water it will idle in nuetral and also in gear. It accelerates in neutral but will die or lack power if I increase throttle while in gear. Engine will somtimes get to top speed but often while running at top speed engine will start to slow rapidly. Engine has full range of operationout when out of the water where there is no load on engine but is still difficult to cold start. Before these recent problems the engine sat up for several months and I had to change the impeller and spark plugs. Spark plugs fire, cylinders have proper pressure of 100, 100, and 110. I cleaned some fuel lines and filters and got new gas.
ANSWER : Every sympton you are describing here can be attributed to fuel starvation due to blocked jets and or water in carbs, when your engine dies does it die with dry plugs, or wet oily ones?

Spark plug wire boot grounding out on coil, 96 outback 2.5 automatic, just put new spark plug wires, new spark plugs, and new coil on. ran great for two weeks, now spark is jumping out of boot at coil on one wire, put old coil back on and still does it in the same spot. replaced wires again, and still does it in the same spot. seems to do it only under a load. Is my new spark plug on that cylinder bad? Does the coil need some insulation under it? It is the coil that sits right on top of the motor. Any ideas? thanks.
ANSWER : Sparks are high voltage, and will always follow the path of least resistance. If you can visibly see a spark (whether in a lighted area, or in the dark), that means either that a plug wire (or coil wire) is open (non conductive), or your have a carbon track on the surface where the spark can be seen, but most likely you have BOTH problems!

If you have an ohmmeter, check the resistance of each wire involved, particularly spark plug wires … which means you must be able to connect to both ends of each wire at the same, and hopefully, FLEX those wires, to be sure they don’t have a break inside that is intermittent (comes and goes)!

I have a 99 yamaha f100 four stroke outboard. Problem I have is boat will acclereate fine get up on plane and after running for about a mob at wot will decell and only run around 4500 rpm. Then after coming back to idle will have a slight miss then run smooth and repeat every run. Changed the plugs and fuel filters alll oe yamaha has fresh oil timing belt is good any ideas will help or fuel psi spec. I am an ase master automotive tech so I know alot about engs. To me it feels like it’s running out of gas. Like the carb bows are full when I take off but then runs out after running wot. Any info will help
ANSWER : I have exactly the same problem with my Yamaha F100, have you got any solutions yet?

2005 4 stroke yamaha 150 550hrs. normally use every week but due to surgery not used for 10weeks. Just before I went down I changed internal fuel filter, and zincs in motor. finally put in sunday. motor started fine left dock hit the power and started to come up on plane then stuttered and died. changed the external fuel/water seperator pump up the primer and started up again. with in a minute died down again. limped back to dock checked fuel filter and plug wire connections. pumped up primer and left dock went right onto plane for maybe 150yds then coughed and died. I could pump up primer and it would run but then die out. the fuel filter at the front of the engine would run dry until I pumped it up again. If it were a car I would suspect a leak in a fuel line but I can’t find any sign of one.
before we launched I put 10 gallons of fresh fuel in and added another bottle of ethanol stabilizer (CRC brand)
what proceedure should I follow to isolate the problem? I am a fairly competent mechanic as far as cars and trucks go. I don’t really want to have to take it to a marine mechanic.
ANSWER : This is going to be the fuel pump is not pumping any fuel. The primer is acting as a fuel pump. When you prime it, it gives the engine enough fuel to run for a little bit. But as soon as the fuel runs out, the engine is dying. So this is going to be a bad fuel pump.

I bought a new mossberg 590 a1 shot gun a month ago, I love the gun but its having a couple of problems, the first problem is that when shooting every once in a while i get sprayed in the face with exuast from shooting through the safety very scary! any ideas whats causing this? how to fix it? second is that some times the fireing pin sticks and the gun will not discharge a round? the third problem is that i have had feeding issues with gun where it will not realice a gound from the tube, ive taken a tip of a knife to the stuck round in the tube and it prys out with little effort, these problems dont happen every time i go shooting, just every once in a while, but they a happening more and more, im conserned cause the gun is brand new, and i wanna be safe while shooting, can you guys help me? any ideas/solutions? please help!!!!!!!
ANSWER : Personally, with that many problems, I’d call Mossberg and get a return authorization. None of these things should be happening, especially with a new gun.

Water in the fuel tank of my Zodiac dinghy with Yamaha 2001 50 HP
ANSWER : I’d add a little dry gas to **** up any remaining water and give it a shot

Turned poulan pro 42 inch 18.5 HP Briggs and Stratton mower off after 1hr of use to move a board I was about to mow over. Tried to restart it but it just backfires. Removed spark plug and it looked fouled. Cleaned it up but when looking at spark it is orange in color. Bought new spark plug and now get white spark. Installed new spark plug and it still backfires. Plug is wet with gas. Any suggestions?
ANSWER : Check the valve clearances and especially the inlet valve to make sure that it is not riding (staying slightly open) B&S are notorious for valve problems as most of their motors do not have a valve adjustment on them, the valves stems have to be filed/ground down to get a clearance. Somewhere between 0.010 to 0.015″ is near enough for the inlets and about 0.005″ more for the exhaust. It is not critical.