Question about Yamaha WR 450 F Motorcycles

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Wr450 09 no fuel in the carby bowl after dropping the fuel. i went to the servo filled up and then it wouldn't start.changed fuel put in new plug and dumped the fuel out of the bowl not much came out

Has anyone got any ideas why this may have happened as i only got new jets put in about 2.5 months ago and have only had a hand full of rides since.

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  • Yamaha Master
  • 42,992 Answers

Hi, Tony always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working*
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Gas not getting to carb motorcycles
Fuel not getting in carb
YAMAHA WR450F Owner Service Manual
OEM parts for Yamaha
YAMAHA WR450F Owner Manual

Posted on Oct 24, 2016

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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polarcycle
  • 1392 Answers

SOURCE: getting a fuel dump

Sounds like you need to clean the carbs out, as they are probably gummed/varnished badly after sitting for 2 years.

Posted on Mar 08, 2009

DickCanFixIt
  • 948 Answers

SOURCE: dead battery after a long ride

Yes, it could be the regulator. Running a battery flat MAY kill it, so try to recharge it and then load test it. Put a fully charged battery in the bike. Hook up a voltmeter and start the bike. Rev engine to about 3-4000 rpm. If your regulator is working you should be getting about 14v. If the reading does not change from what it was before you started the bike, your charging system is not working. Do test the parts before you simply replace them.

Posted on Mar 16, 2009

tabbycat282
  • 56 Answers

SOURCE: 1989 tw200 yamaha won't start

G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..

Posted on Jun 03, 2009

ollie reece
  • 1167 Answers

SOURCE: my gpx250 wont start unless i put fuel in airbox

hi buddy take the carb off and take the bottom of the carb off by undoing the 2-4 screws an just pop the bottom off and inside will be the float this needs adjust you need to slide the pivot pin out and the float will just come off with the inlet valve still connected take this inlet valve off just slides off and bend the tab down wards so it allows more fuel in the carbs f2b20fc.jpg
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Posted on Sep 14, 2009

DoubleClutch
  • 376 Answers

SOURCE: Air box and crank case fuel flooding problem

Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.

Posted on Sep 29, 2009

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Please rate this solution. Thanks!

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