Question about 2003 Yamaha YZ 250

4 Answers

Quad keeps goin through spark plugs

Hi my yamaha blaster will run for few days then when i start it the following day it will go for 10min then stop i remove the spark plug it is black an sometimes wet even after cleaning it wont go it has to get a new one then it will go for few days again then repeats itself

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  • damien29 Jul 26, 2009

    hi what is the ratio i was told it 40:1 is that correct,thanks

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Yamaha recommends a 32:1

Posted on Sep 04, 2009

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Or is the choke sticking on????

Posted on Jul 30, 2009

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Run a mixture of 30:1 and adjust the air/fuel on the carb if needed.

Posted on Jul 29, 2009

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The engine is running 'rich' thus fouling the spark-plugs, you will have to set the air-mixture ratio.

Posted on Jul 26, 2009

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1 Answer

Yamaha Blaster won't start, carb is good, has a new plug, tried the fuel in the plug thing still no go, what do I check next?


Hi, Phillip 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. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
8. 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.
9. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
10.. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
11. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
12. Faulty neutral, clutch lever, or kickstand safety switch.
13. Faulty fuel pump or fuse or relay.
14. Tilt sensor needs a reset.
15. 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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I have a 2004 Yamaha blaster , it Won't start and is backfiring when I give it gas when I kick it ,rode like a champ the other day now won't start


Hi, Anthony 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. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
8. 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.
9. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
10.. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
11. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
12. Faulty neutral, clutch lever, or kickstand safety switch.
13. Faulty fuel pump fuse or relay.
14. Tilt sensor needs a reset.
15. 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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http://www.yamaha-motor.com/assets/service/manuals/2001/lit-11626-14-09_246.pdf

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1 Answer

Howdy.I have a 2005 yamaha blaster.Low hours,good spark and freesh fuel.Fired it up the other day and was fine for about 5 min.Then it seemed to loose power then died.I checked fo fuel and spark , bot


the crankcase is filled with fuel from a leaking carburetor float (would be LOTSSSSS of smoke) OR Bad crankcase seal and its sucking in air, bad reed cage area seal, exhaust plugged up!

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MY 1998 YZ 125 KEEPS FOULING PLUG AND THEN BOGS DOWN


Hi, Anonymous and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Incorrect spark plugs for your kind of service.
3. Piston rings badly worn or broken.
4. Valve guides are badly worn and/or seals worn, crushed or have come off valve guide and pump oil through it.
5. Spark plug cable weak or ignition coil faulty.
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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Make sure you have the right heat rated spark plugs .

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Yamaha TW 200 starts but won't run.


If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..

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