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Many possibilities. Mine had been sitting. Old fuel in HP fuel pump reservoir was clogging HP pump. I was able to disassemble, soak and clear pump and get running. New pumps, big money. My boat, twin 150 HP HPDI
Hi, Jordan moisture, condensation, rain, or bike washing can make the bike run sluggish, not able to rev, and misfire. Older bikes, engine configuration, and exposed electrical components are at the front of the line for acting up. During the diagnostic procedure spray Electrical Contact Cleaner on corroded wire connectors/pins/sockets etc. and apply a liberal amount of "DIELECTRIC" grease to the mating harness/wire connectors. WD40 works great for eliminating suspect areas in your quest to find the real offending gremlin.
For additional insurance you can spray a High Temp Clear Coat on the most vulnerable areas it will work like Scotch Guard does on fabric. Fabricate a rubber or plastic splash guard to deflect water coming off the front wheel getting to the front cylinder spark plugs. The design should be adequate for its purpose with the least amount of airflow restriction to cool the cylinders. The usual suspects are:
1. Air filter soaked with water.
2. Water in the fuel system gas tank and carburetors.
3. Wet ignition coil packs.
4. Spark plug boots wore out or loose allowing water to enter.
5. Spark plug cables old and cracked check for spark leakage in the dark.
6. Spark plug wells filled up and drain holes clogged.
7. Water in a wire harness that has exposed open ends and have a sharp bend or crimp allowing the liquid to form its own pool of potential threats to chaffed wiring.
8. Sensitive fuel tuners and downloaded ECM remaps may get confused with the abnormal cylinder temperature difference in a V-4 engine configuration.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. YZ250F starting trouble after washing No engine start after pressure wash Yamaha YZ250FR Owner Service Manual https://www.partsfish.com/page/oem-parts-for-yamaha 2003 Yamaha YZ250F Owner Manual
Hi, Lynnmcneely and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Faulty spark plug.
3. Incorrect spark plug for the engine type or service.
4. Piston rings badly worn or broken.
5. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
6. Spark plug cable weak or leaking check for spark jump in the dark.
7. Faulty ignition coil.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day. Why Does My Dirt Bike Keep Fouling Spark Plugs YZ250F fouls plugs YAMAHA WR250F Owner Service Manual OEM parts for Yamaha YAMAHA WR250R Owner Manual
Have u replaced the spark plugs? Is this the beeping noise you hear when you first turn your key over the same as past times you have started the motor? It just keeps going though right? I would make sure you have the right level of fluids and make sure your fuel pump works, fuel filter isn't clogged and plugs and wires are in good shape.
If that is all good then you might have a bad coil pack. Test it and make sure you are getting correct voltages, if not then replace it.
Also did you winterize your motor after the last time you used it? If not you could of cause some internal damage to the motor.
Something is really wrong.Your gears engage correctly? plug on the spark plug's cap a new spark plug and ground it on the engine and crank it to see if there is any spark.If it is then check your carb.
1983-1985 Yamaha IT250K.
You need several things to get it to start: A clean carbuerator, a good reed cage, a good, clean spark plug, and compression.
Start by pulling the spark plug. If it's oily/dirty, replace it. Then kick the engine over, and you should get the motor to turn over really easy. Place the plug back into the hole, and the effort to turn the engine over should be hard, if there is compression. If there is no compression, you need to remove the cylinder head to find out why. It could be a hole in the piston, bad rings, or worse, bad crank seals. If the piston looks okay, then chances are the problem lies in the Mikuni carbuerator. It's an simple device, but you need to make sure the needle seals the bowl when the float level is correct. You also need to make sure your air enrichment circuits are free of dirt and varnish. Give it a good scrubbing. Once the carb is clean, and the float level is sound, make sure to check the air filter to ensure it is clean. The carb ensures fuel is correct. Lastly, there is spark. Your plug wire shouldn't have any cracks, and when you crank it over, there should be a spark from the plug. There is a remote chance that the pickup coil has burned out, but the ignition system on these old Yamahas is pretty reliable, so look there last of all.
Check the rubber boot that joins the carby to the engine to often have seen the hose clamps over tightened therefore creating a split in the rubber letting to much air in giving the rough idle eventually you wont be able to start it at all (have a good thorough look inside an outside of boot doesnt take much)