Question about 2004 Yamaha YZ 250 F

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Hard starting my 09 yamaha 250f when hot - 2004 Yamaha YZ 250 F

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  • Yamaha Master
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Hi, Dans04gt and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged, should have 12.5 volts.
4. Discharged battery, 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.
5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
10. Enricher valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition is not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Dirt Rider Magazine
04 yz250f wont start when hot WR YZ 250F
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Aug 01, 2016

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Posted on Jan 02, 2017

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SOURCE: 2006 yamaha yz 250f starting problems

You may be having trouble with a sticking intake valve. Remove the valve cover and spray some WD-40 onto the valve and spring. Try to operate the valve with your fingers to work it loose. Once the engine starts running, it should improve. You may need to change the oil. Good luck.

Posted on Jan 30, 2010

sisadsl
  • 1508 Answers

SOURCE: i have a yamaha yz 250f 2006

if the bike push starts, i assume it runs good,
if the kick does not turn motor over, there is a spring clip that engages the kick gear that may be broken or misplaced
if the kick start turns the motor over, you have to use decomp to get just past TDC then kick

Posted on Apr 11, 2010

Testimonial: "thanks very much for help "

sisadsl
  • 1508 Answers

SOURCE: will not start

Make sure the carb is clean as the fuel gets old sitting in the bowl, and i have heard of a few of these,doing the same that need the valves adjusted, just dont ask how this can happen while it it sitting in the shed

Posted on May 01, 2010

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My yz250f is taking too many kicks to start it


Hi, Randall and the usual suspects are:
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3. Restricted fuel supply.
4. Gas cap and or fuel tank not venting properly.
5. Plugged slow jet or passages.
6. Inlet system air leak.
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.
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http://www.dirtbikeworld.net/forum/archive/index.php/t-23849.html
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OEM parts for Yamaha
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