Question about 2004 Yamaha YZ 250 F

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2004 yamaha yz250f ran all weekend then the next day after riding it, it wouldn't start

I just bought this bike 4/20/13 and rode it that day and the next day then i went out to start it the day after that and it won't start. when it was running it would bog a little and when it was idling it would randomly so i took the main jet out to see what size it was so i could get a different one and it hasn't ran since then. I've kicked it a million times and tried bump starting it but the most I've gotten it to do is backfire. it's getting gas, has spark, and has compression.

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  • Yamaha Master
  • 42,928 Answers

Hi, Alex and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Bike won start just backfires occasionally
Dirt Rider Magazine
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 31, 2016

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 125 Answers

SOURCE: bike wont start, lights come on, has gas, wont kick start either

1st is all the way down, neutral is between 1st and 2nd. Sometimes hard to find.
The problem is probably a dead battery. Try to start it using a jumper cable off the car (if you know how) Get some help from someone who knows something about motorcycles.
Please have your son take some kind of lessons before he rides much. I don't want to cast a pall on his fun but he will be better off. (And live longer)

Posted on Jun 16, 2009

zaldyboy01
  • 293 Answers

SOURCE: i have a 2004 yamaha yz250f it will only start with starter fluid

check the carburator if there is a gas goes to it

Posted on Aug 30, 2009

czaa
  • 4535 Answers

SOURCE: I just bought a 1990

if its a 4 stroke then the timing sproket cudda loosend and piston bent the valves--send issue to majicmech@aol.com hes a master

Posted on Aug 08, 2011

Motoxpartson
  • 185 Answers

SOURCE: Hi i have a 1995 yz250 the bike was fine till one

Hi mate I would be getting someone to check resistance on your stator its a simple test only requires a multimeter but hard to explain on here - From what your saying I think this test could save your headache!
Once stators fail they can be completely unreliable such as allow you to push start but not kick start or allow you to start but as soon as bike warms up fails completely until cold again they even can give false reading when you test to see if spark is at the plug as you see spark but is not strong enough or is sparking at wrong time... I have had bikes come in my work shop where guys have been confident has spark and they have rebuilt and replaced everything you can imagine but all it was the stator failing with not enough resistance..

regards Jamie

Posted on Aug 16, 2011

FirsLonewolf
  • 186 Answers

SOURCE: my 2004 yfz 450 wont start i changed my plug

Depending on the type of riding you were doing I would check out all the connections to the battery and starter especially the ground for tight clean connections, if all this is good you may have a bad cut off switch.

Posted on Sep 30, 2011

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