Question about 2001 Yamaha YZ 426 F

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2003 yz 426 f hi can you tell me if my bike

2003 yz 426 f hi can you tell me if my bike need the neutral switch connected before it will start
? wat does every wire do on the neutral witch ?

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  • Yamaha Master
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Of course, The neutral safty switch is in series with your starter circuit.. three points: at clutch lever, at kickstand and at the transmission.. Do not bypass any of these switches. Good Luck.

Posted on Nov 14, 2009

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YZ426 IS RUNNING HOT CHANGED STATOR AND TIMING IS OFF


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2. Restricted radiator air flow.
3. Faulty thermostat.
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6. Air in the coolant and needs bleeding.
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1 Answer

My brother has a 2001 yamaha yz 426 and it won't start. I have tried changing the plugs and i have checked everything else on the bike, but the only problem i am running into is the kick start part. it has...


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a reset.
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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Feb 12, 2014 | 2001 Yamaha YZ 426 F

1 Answer

Yamaha yzf 426 fifth gear miss fire


Hi, Buzaa 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.
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Sep 11, 2012 | 2002 Yamaha YZ 426 F

1 Answer

Yamaha yzf 426 fifth gear miss fire


Hi, Buzaa 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.
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Sep 11, 2012 | 2002 Yamaha YZ 426 F

1 Answer

It will only start by pulling behind a vehicle when its cold. Wat could be the problem I'm thinkn it needs a valve adjustment


hi, coud well be a compresion problem, when the bike is started will it tick over or does it just peter away and stop if you remove your hand from the throttle? recheck the valve clearances, have they been adjusted with the engine on he correct stroke? when the cam lobes are facing down the valve clearenes should be set with the engine on tdc, and cold, it is always best to have a slightly larger clearence to alow for expansion , good luck paul

Feb 13, 2011 | 2002 Yamaha YZ 426 F

1 Answer

What is the red bottom on the carb of a 2001 yamaha yz 426


if its the one by the choke it is the "Hot start", if you have trouble starting in warm weather it should help the bike start....i am no mechanic but that is my understanding.

Feb 11, 2011 | 2001 Yamaha YZ 426 F

1 Answer

2000 426 yamaha wont start. its been sitting for 2 weeks and ran fine last ride. gettin feul and spark but wont start. not even with starting fluid. dont know how good the spark is but it does have some....


Hi, Kmennes only timing and compression are left and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a reset.
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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Aug 01, 2010 | 2002 Yamaha YZ 426 F

1 Answer

2001 YZ 426 F: what kind of coolant should you use for this bike?...


Hi, Anonymous 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

WHERE IS THE FILL PLUG ON A YZ 426


Hi,

Yes, this is where you fil the motor oil.
Don't overfill, this bike uses a dry sump.

Cheers
Jon

Mar 13, 2009 | 2003 Yamaha YZ 450 F

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