Question about 2003 Yamaha WR 450 F

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Hesitation problems 2003 yamaha wr 450 f

I have hesitation problem off idle. The bike spits and sputters from 0 -1/4 throttle opening. Wide open runs great. I've adjusted the fuel/air mixture screw with no real results. screwed all the way in will not shut the bike down. I'm lost, please help

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  • Anonymous Feb 17, 2009

    I have a 04 and have the same problem, Please help us.......!

  • Anonymous Mar 25, 2014

    When starting I have the choke on but not all the way, as the bike warms up I turn the choke down or completely off and sometimes it will not stay running. At times I give it throttle and there's a Slite hesitation

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Sounds like a jetting issue. change the main jets starting from the largest one you own and work your way down.

Posted on Dec 14, 2008

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Posted on Jan 02, 2017

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I have a 03 wr 250, it idles ok but backfires and throws small flames from ex when throttle is opened fast, but not opened slowly,


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Mar 27, 2011 | 2003 Yamaha WR 250 F

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2001 WR250F WILL NOT IDLE AND BACKFIRES ON DECEL. AND SPITS/SPUTTERS WHEN THROTTLE IS APPLIED WHEN UNDER LOAD


these symptoms usually point toward lean on fuel for some reason
most common would be dirty or gummed pilot circuit and pilot jet I would remove carb and take out the pilot jet clean or replace with new - blow compressed air through the hole the pilot jet came out before reinstall
depending what altitude you are a bigger size pilot jet may assist this issue also but clean and replace original pilot jet and circuit first to confirm

Jan 02, 2011 | 2003 Yamaha WR 250 F

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Engine smoke on de-cell/let off throttle/


The cylinder is in the front of the bike and on a down hill the oil in the crank case could be pushing past the ring. Yes, it could be an over full situation. Only run the recomended amount of oil. You can actually rob yourself of power and do damage by over filling. I've already seen a guy blow the soft plugs right out of his Yamaha by over filling the oil. Also, be careful when changing your air filter. It can be very easy to drop dirt inside and that will definately score your cylinder walls and cause permanent smoke. It is most likely exactly what you think it is. Good Luck.

Mar 30, 2010 | 2003 Yamaha WR 450 F

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Warming up the bike on idle and noticed one of the exhausts was glowing red its a 1980 xs eleven special


soounds like a leaky exhaust valve to me,,,do a compreshion test first to check it could need the carbs reset up if its running week on one pot this could do it too

Mar 02, 2010 | 2003 Yamaha WR 450 F

1 Answer

No top end


does it have diaphram in carb if so check for slack

Jun 21, 2009 | 2003 Yamaha WR 450 F

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