Question about 2004 Yamaha YZ 250 F

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2004 yz250f runs great through four gears than 5th gear runs rough. It kind of misses.

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  • Yamaha Master
  • 43,775 Answers

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
http://www.dirtbikeworld.net/forum/archive/index.php/t-67860.html
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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sisadsl
  • 1508 Answers

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"

heimlich
  • 1978 Answers

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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I'm missing a switch on top my manual transmission on 91 geo tracker, that I was told that it was a 5th gear switch... can't find anything to show this. Is there such a switch?


Not sure what you mean by "switch" but shifting from 4th gear to 5th gear is the same motion as shifting from 2nd gear to 3rd gear.

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What kind of oil goes in the gearbox for my yz250f


Hi, Anonymous the engine oil lubricates the transmission for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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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1 Answer

My yamaha roadstar is a 2004 and runs rough at low speeds in 1st thru 3rd gears, misses some, and runs perfectly at higher speeds in 5th gear. When its cold start on cylinder seems to have a small pop


Hi, Buzzy 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 check for spark leakage in the dark
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. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system.
12. Carburetor damaged, contaminated, sticky float, plugged jets.
13. Multiple carburetors out of sync.
14. Fuel filter clogged.
15. Old or contaminated fuel.
16. Fuel tank vent system plugged or carb vent line closed off.
17. Gas cap diaphragm valve faulty.
18. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
19. Carburetor controls misadjusted.
20. Incorrect valve timing.
21. Valve springs floating, weak, or broken.
22. Damaged intake or exhaust valve.
23. Incompatible performance parts.
24. Control module may be in "LIMP" mode
25. Check for engine trouble codes.
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.
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1 Answer

What kind of gear oil for yz250f


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.

Nov 01, 2010 | 2004 Yamaha YZ 250 F

1 Answer

I have a 2006 yz250f and it seems like the clutch is slipping in 5th but its great in all the other gears


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.

Oct 15, 2010 | 2004 Yamaha YZ 250 F

1 Answer

2004 honda crf 450 r


Your gear are worn out, you wil have to reaplace the gear, beter let a good motorbike machanic do it. very easy to mess it up

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Hi
there is no overdrive buttone in VW.
Seems like you need new clutch.

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1 Answer

I have a 1997 Cavalier thats a 2.2 and its running really rough.


sounds like it may have a bad ignition miss. check spark plugs, wires, and coil packs.

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