Question about 2003 Yamaha WR 450 F

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Why is my wrf 450 petrol tank getting cracks in it

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Plastic tank? If so, I suggest it is due to old age and/or the new 10% ethanol gasoline. I had a plastic funnel crack and fall apart on me that I'd had for years. I was pouring the new gas through it when it fell apart, maybe a co-incidence, but I think it was the gas.

Posted on Jun 07, 2010


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Posted on Jan 02, 2017


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Water in petrol tank

no year, huh?
many ways .
  1. driving gas cap off
  2. rust on top of tank.(look)
  3. hoses on tank, any missing cracked or fell off. (all vent and filler)
  4. the gas station fuel was bad.
  5. some prankster put it in.
  6. did i miss any?

Mar 09, 2014 | Suzuki Grand Vitara Cars & Trucks

3 Answers

I have a 2003 ford focus,2.01 ltr. engine:problem is, I have to always keep the tank full cuz when it reaches 3 quarters of a tank it starts running rough,the check engine lite comes on then it dies until...

Look at your gas cap. There is a seal. You are looking for cracks that will allow air into the tank. This causes the vacumn that captures fuel fumes to not occur. The empty tank gives a larger volume to have to lower the pressure making the problem show up.

Dec 15, 2013 | Motorsports

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I have a 2004 wrf 450. Starts up fine.Then cuts out! I've tryed a new pickup coil. And a new plug. I'm blagged

Hi, Chris_b555 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, your battery may show 12.5 volts but have little or zero amps and needs to be replaced.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, points/condenser ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. Fuel tank contaminated with ethanol sludge.
15. The gas cap is not venting properly or fuel tank venting system blocked.
16. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
17. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the blue links below. Good luck and have a wonderful day.
idles fine dies when trying to accelerate
WR450 Won idle Needs Choke on to idle
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Apr 15, 2012 | 2004 Yamaha WR 450 F

1 Answer

2005 yamaha wrf 450 oil change instructions

Hi, Kylie 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 zero $0 you can download another one.
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.
2005 WR450 Oil Change
How to do fast oil change Yamaha WR450F 5QJ8H
Yamaha WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Oct 07, 2011 | 2005 Yamaha WR 450 F

1 Answer

Hi my son has a drz70 and it just conked out on him lastnight, I have checked all the basics but hthere seems to be a petrol smell in the oil does this mean the head is cracked.

No, the head is not cracked. Basics: new spark plug, gas in the tank. Drain the carburetor, ( it may be filled with water from condensation in the petrol tank ), clean the air filter, check for spark on the new spark plug, handlebar and side stand kill switch (if your model has one), ignition switch, battery connections, fuses and wire connections. Chances are the petrol smell is just piston blow-by mixing with the oil in the gearbox. Don't worry about it too much. Please rate my answer. Thanks.

Apr 21, 2011 | Suzuki DR-Z 400 SMZ Motorcycles

1 Answer

Wrf 2003 kickstart problem

Contact the dealer and talk to the parts department. They will advise you from there.

Aug 18, 2009 | 2003 Yamaha WR 450 F

1 Answer

Petrol is getting into my engine oil on my crf 450 2007 . checked valve clearences and they are fine .

Make sure that you turn your fuel to the off position when you leave your bike sitting for more than a day. Gas will sometimes leave the tank, and pass through your carb, and into your cylinder. It will then bypass your rings and seep into your oil. Dosen't happen overnight, but after about a week i becomes common if your float is sticking. Good Luck.22

Jun 22, 2009 | 2002 Honda CRF 450 R

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