Question about 2003 Yamaha YZ 450 F

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03 yamaha warrior has gas and spark but wont start

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Ck the Exhaust valve sometimes it will tighten up after someone dose a adjustment in some cases just over time and ck compression it should be at least 100 psi to run. to ck valves set the motor to top dead center on the intake stroke or the valves will be tight on the ex stroke

Posted on Aug 31, 2010

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03 rx1 no start, i have power to starter, no dash lights or spark? motor does turn over.


Starter could be froze. I had one and if I hit it with a rubber mallet it would turn. Also check the juice of your battery it might be too weak.

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2001 yamaha 350 warrior that will start and idle but when you give it the gas it stalls.i've taken the carb off and cleaned it changed the plug. removed the wire from the emergency break lever. and it...


If you have good spark then it's most likely a fuel issue, anything off of idle is dealing with the main jet and metering needle, clean jet and check needle for excessive wear.

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2002 Yamaha Roadstar Warrior will not start


Hi, Jjs186 and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the enrichner.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
14. 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.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch lever, or kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. 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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Jun 18, 2011 | 2002 Yamaha Road Star Warrior

1 Answer

Yamaha xt 125r wont start up


hello, check and see if plug is firing a blue color, if not you may need a stator-pickup coil, i have a 2000 warrior, it is firing, orange and white color, stator neede to be replaced, pickup coil was going out, also check ign coil, these have a problem with getting weak after a while. most likely it is your stator pickup coil, no blue fire from plug, no running the motor. my stator pickup coil was going out. no blue fire from plug, i was told by a yamaha mechanic, no blue fire from plug it will not run, has to be blue, not orange or white looking fire.make sure carb is clean and all jets inside are clean, and air passage ways

Feb 22, 2010 | 2005 Yamaha XT 125 R

2 Answers

My yamaha warrior was sitting for about a yr wont start


Clean the cab, the pilot jet is not allowing enough fuel through so when you turn the choke off there is too much air and not enough fuel in the fuel mixture causing it to die.

Nov 24, 2009 | 2004 Yamaha Road Star Warrior

1 Answer

98`350 yamaha warrior elertic start


may want to chec fuse-sometimes a normal lookin one is bad-test inspect wiring in ignition system for corrosion-cuts plug wire could be bad or connect

Aug 20, 2009 | 2003 Yamaha YZ 250 F

1 Answer

98 YAMAHA WARRIOR 350 WONT START


have your carb. rebuilt and make sure there is not anything in the intake tube between the carb and the engine.

Jun 01, 2009 | 2002 Yamaha Road Star Warrior

3 Answers

Yamaha warrior won't start


If you are getting a nice bright blue spark then no, the last time I had a problem like this it was sugar in my tank. If you taste a bit off your finger and it is the slightest bit sweet, then some one has sugared your tank. If so just flush the tank with a little fresh fuel and then flush the carb, and fuel lines by spinning the engine over for a bit then try to start again.
Is yours an electronic ignition or points. If points gap could be wrong or even timing slipped. That has happened to me also.

Apr 29, 2009 | 2003 Yamaha YZ 125

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Yamaha warrior atv [yfm 350] bogging problem


Try checking the switch for your parking brake. It is the top wire in the clutch handle boot. This wire connects to your CDI box, and restricts the RPM's while the parking brake is engauged. To find out for sure, trace the wire down to the plug under the headlight assembly and disconnect it. Now try starting you machine and give it some throttle!

Apr 18, 2009 | 2002 Yamaha Road Star Warrior

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