WR250F carb issues

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WR250F carb issues

Post by curl666 on Sun Mar 29, 2015 6:26 pm

Evening all,

I have recently purchased a 2004 WR250F, the bike has been unused the past 4 years, only started now and again.
When I collected the bike, with the fuel tap on, the bike would leak fuel through the bottom drain pipe on the carb.

I assumed the float was stuck, due to the lack of use. Over the weekend, I removed the carb, gave it a good cleaning and checked the operation of the float.
Everything looked ok to me, but I'm not an expert on the carb. Float moved freely, no signs of gunk inside etc.

I have just refitted the carb, but it still leaks. I checked the allen key drain bolt on the side of carb this works.

Any help? Does anything else other than the float cause the fuel to leak?

James

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Re: WR250F carb issues

Post by JTM525 on Sun Mar 29, 2015 6:32 pm

Its the valve, if there's the slightest bit of crap in there it'll leak, i had the same on a ttr125 and replaced the needle and the seat and it worked perfectly! All for the princely sum of about £10!
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Re: WR250F carb issues

Post by curl666 on Sun Mar 29, 2015 7:13 pm

Thanks for the reply.

[You must be registered and logged in to see this image.]

Which parts are you referring too, what number are they on the photo above?

Many thanks
James

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Re: WR250F carb issues

Post by JTM525 on Sun Mar 29, 2015 7:20 pm

It's 25 and 28, check the actual float too to make sure it's not got a hole in it and letting petrol in
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Re: WR250F carb issues

Post by curl666 on Sun Mar 29, 2015 7:34 pm

Thanks cheers

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Re: WR250F carb issues

Post by JTM525 on Sun Mar 29, 2015 7:41 pm

No problem mate ! I went through the same thing with that ttr so I know how much of a pain in the arse it can be Laughing
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Re: WR250F carb issues

Post by geraint on Sun Mar 29, 2015 8:15 pm

another one that might need looking at is the float height settings
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Re: WR250F carb issues

Post by wolfy on Sun Mar 29, 2015 9:45 pm

The needle valve is the second one down from 25 but could be the seat too just above it.
Tho! like Geraint said it may need setting, on 27 in the middle where the needle valve sits may need a little bend up to make sure the valve is closing.
Be careful not to bend it to much or you will keep running out of fuel when flat out.
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Re: WR250F carb issues

Post by curl666 on Tue Mar 31, 2015 2:56 pm

Think I'll check my heights first and clean it out again.

The photo above is from an earlier model, my carb just has a single valve in its place £37.99 from Yamaha!

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Re: WR250F carb issues

Post by Taffy350 on Wed Apr 01, 2015 7:22 am

loosen the drain plug off at the bottom of the float bowl, pull the fuel pipe off the fuel tap & stick an airline down it, it will blow all the shit out of the valve which should re-seat itself after, a very handy tip shown to me by Dene (2 wheel engineering)
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Re: WR250F carb issues

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