Question about 2002 Yamaha YZ 426 F

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My YZ426F has fuel and spark but refused to start. After kicking it for like ever and ever it started but the exhaust (front) went red hot literally. What could be the problem?

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Thankz to the fixya team,
between my dad and i, we managed to solve the problem. Regards to the starting, well all we did was change the plug, the original plug had a faint spark, after fitting the new one, two tries and she started. With regards to the exhaust, well the hot start knob has a valve and this valve has a little spring that operates it. Well this little spring was really knackered and after replacing it with a substitute spring, ive not had any problems since. We reckoned it was getting to much air into the combustion chamber, therefore igniting petrol in the exhaust, (hence the glowing red hot pipe) since we changed that spring, this hasnt happened, we reckon thats the solution to this problem.

Regards

Hudz.

Posted on Nov 17, 2008

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The timing

Posted on Nov 15, 2008

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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.
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7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
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10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
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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.
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16. Faulty CDI box if applicable.
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18. Security system not disarming alarm needs a reset.
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Hi, Anonymous 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.
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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.
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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
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Feb 08, 2014 | 2001 Yamaha YZ 426 F

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2002 yamaha yz426f wont start when its cold


Hi, Jacki_edri 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.
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Dec 06, 2012 | 2002 Yamaha YZ 426 F

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01 yz426f acts like its not getting fuel after about 30 kicks it will fire for about 5sec then dies used some starting fluid same thing so i took off the air box to look inside the carb held it wide open...


Hi, Rob 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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Oct 30, 2011 | 2001 Yamaha YZ 426 F

1 Answer

Hi I got a 98 yz 250 new clutch plates piston negosiled barrel new ring and shortcut the gears I kicked it and it started on the 3 rd try I ha then added more fuel and mixed 200 ml oil to 5 liters petrol...


Replace the spark plug to new one they rarely come good or be reliable once fouled shouldn't need to clean carb but if were mine I would clean it anyway
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Aug 04, 2011 | 2008 Yamaha yZ250

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I have a 1986 Yamaha yz490. it ran great until it sat for two years when i went to start it it felt like it wanted to start. I replaced the spark plug and replaced the fuel filter. when i kicked it over i...


Your cylinder is probably full of fuel, becareful here. Disable the spark and kick it over with the spark plug out to remove the fuel.
Your problem sounds like a stuck float in the carburator. It needs to be removed and cleaned out good.

Jul 16, 2011 | Yamaha Fuoco Centenario Motorcycles

3 Answers

My motor wont start..!


  1. The carb has 2 choke knobs,red and black one,black for cold start and red for hot start,I found on my 426 that by pulling the black one every time I try to start the bike,the bike starts hot or cold.When it started press the choke knob back.
  2. A dirty air filter will also make the bike difficult to start.
  3. Do not open the throttle even a bit whilst kicking it,the carb tends to flood very easily and then you are going to kick the bike for ever and ever.
  4. The exhaust turning red hot I'd suggest you get the carburator's jetting checked out,it can be because your feul/air mixture is not right and this could also be a factor in your starting problem,but another reason can also be when the bikes stands still whilst idling or even being revd whilst not in motion the engine tends to get very hot very quickly,the bike does not have a electric fan blowing threw the radiator,and if you did not know your exaust system removes between 60-70% of your engines heat,so it will turn red hot if your are not riding so the cold wind can blow over the exhaust and threw the radiator.
  5. You say you get good spark,where did you test it?Did you check the spark plug itself,or only the sparkplug lead,I find the 426 to be very hard on spark plugs,when I find my 426 difficult to start the first thing I change is the spark plug and it solved my problem many times.
  6. You also mentioned you have feul "to" carb but do you have feul - carb to engine.
  7. How does the compresion feel when kicking the kickstarter,any lack in compresion could indicate a sticky valve in the open position,the unexperianced rider will not kickstart this bike due to the amense compression these bikes have (Ratio 12.1).
Just a few suggestions I hope one works for you.

Nov 14, 2008 | 2002 Yamaha YZ 426 F

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