Question about 2003 Yamaha YZ 250

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I have 1991 yz 250 that won't start but it gets good spark

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  • Yamaha Master
  • 43,785 Answers

Hi, Sa_xo 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.
Dirt Rider Magazine
Compression Fuel Spark NO START
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Posted on Jul 25, 2016

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: yz 250 wont kick start

Hi andersondts.

To get you right there i believe it should read as 'jump' start and not 'bump' start ...:-)
Well the problem could be with the battery, is it a maintenance free (dry) or is it a wet 0ne (uses sulphuric acid specific gravity 1250).
( 1) How old is the battery?
( 2) If its a wet one ,check the specific gravity of the acid in it, if its low thn charge it.You may hve to add or top up to its required level , if so thn use distilled water only !
( 3) If the battery is more thn 17months old ...replace it.
( 4) Its not bad to get the charging rate of your bike to make sure that it is working properly as required.

I hope this will help.
GOOD -LUCK.

Knight.

Posted on Feb 02, 2009

  • 48 Answers

SOURCE: yz 250 1992 wont kick start

check your compression I had a 94 yz that done that when i checked the compression it was really low so I put new rings on the piston and that's all it took to bring her back to life

Posted on Feb 03, 2009

techcertfide
  • 26 Answers

SOURCE: No spark on my yz 250 07 mod

when ever you don't have spark . the best thing to do is start tracing back to where it stops. if its not the plug make sure the wire is aok, if the wire is good, check ignition coil. these checks are better made with the help of a multimeter or ingition mate. both special tools are designed to fix those kinds of problems.

Posted on Jul 31, 2009

ollie reece
  • 1167 Answers

SOURCE: 98 YZ 250 started sputtering at higher rpms?

just change the plug buddy use a br8eg and get back to me if still not starting

Posted on Sep 28, 2009

ollie reece
  • 1167 Answers

SOURCE: i have a 1991 yamaha yz 250 it starts then shuts off

change the pkug first buy a br8eg plug off ebay and see how this goes get back to me also are you using the choke on start up

Posted on Sep 29, 2009

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Why02 yz 250 won't kick or pop start runs while pulling it but dies as it stop rolling?


Hi, Anonymous you may have a faulty cdi or charging coil issue 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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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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May 15, 2014 | 2003 Yamaha YZ 250

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I have a yz 250 Yamaha layed it over on it side and now can't get it to start put new spark plug in has spark but won't fire


fuel problem take out the carb and clean all the jets and the bowl also put a high flow fuel filter in as a precaution incase there is debree in the tank your problem is that you are not getting enough fuel or any at all.

May 11, 2012 | 2003 Yamaha YZ 250

1 Answer

2003 yz 250 "wont start"


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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2002 YZ250 won start mad
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 19, 2012 | 2003 Yamaha YZ 250

1 Answer

Yz 250 won't start


HiStart by taking apart the carburetor, replacing the gasket and cleaning it. Then change the spark plug and put fresh gas in. The air filter wouldn't be a bad idea either but you can look at it and tell if you need that. If it doesn't start after that, find someone that can help you troubleshoot.
Hope this works

Feb 23, 2012 | Motorcycles

2 Answers

My yz 250 will start with a roll start,but I can't


Not sure of the age of your YZ 250 ( You never said!) but in most Yamaha they use dual stage stator which means a stator will charge a spark plug at two speeds one on kick starter speed and the other on running speeds it is common that the low speed circuit on the stator to fail leaving you with a bike that only starts when pushed its a very simple test to diagnose it be worth checking you have spark on kick starter speeds with spark plug out the motor but still connected

Dec 04, 2011 | 2003 Yamaha YZ 250

1 Answer

My zzr 250 cuts out and won't start again straight away


petrol is low swtch to reserve or clean your fuel **** they have filters on them may be block this happens from time to time
and check you have a good spark

Oct 18, 2011 | 1991 kawasaki ZZR 250

1 Answer

I have a 1991 yamaha yz 250 it starts then shuts off


change the pkug first buy a br8eg plug off ebay and see how this goes get back to me also are you using the choke on start up

Sep 29, 2009 | 2003 Yamaha YZ 250

1 Answer

98 YZ 250 started sputtering at higher rpms?


just change the plug buddy use a br8eg and get back to me if still not starting

Sep 28, 2009 | 2004 Yamaha YZ 250 F

1 Answer

No spark on my yz 250 07 mod


when ever you don't have spark . the best thing to do is start tracing back to where it stops. if its not the plug make sure the wire is aok, if the wire is good, check ignition coil. these checks are better made with the help of a multimeter or ingition mate. both special tools are designed to fix those kinds of problems.

Jul 31, 2009 | 2004 Yamaha YZ 250

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