Question about 2004 Yamaha YZ 250 F
Hi, J_doe_pics 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. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Dirt Rider Magazine
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
Posted on Aug 01, 2016
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Posted on Jan 02, 2017
SOURCE: i have a 2006 yz250f
If it is going to slip, 5th is where you will notice it first, so it may need new plates, the alloy ones can wear as well as the fibre ones.
Make sure you are using four stroke motorcycle engine oil ( car oils can cause clutch slip due to friction modifiers)
A rough check of the clutch can be done by placing the front wheel against a solid wall, selecting 5, and a handfull of revs, drop the clutch, the engine should stop immediately, if it spins over even a couple of times with the clutch out, it is slipping and needs work.
Posted on Oct 16, 2010
Testimonial: "thankyou so much really helpfull"
SOURCE: what kind of gear oil
If you have a separate transmission oil bath from your piston, crankshaft, head side of the crankcase , you can use 10w-40 JASO MA motorcycle oil. The same oil can be used in the piston side as in the transmission side of the engine. Racers will use 80 wt motorcycle transmission GEAR oil. For an edge you could use 70 wt motorcycle transmission GEAR oil. The transmission gear oil helps preserve the wet clutch and gears in high powered race bikes.
Posted on Nov 01, 2010
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