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3tb carb blocked?? 3tb carb blocked??
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Photo by Alessio Corradini,
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  #1  
Old 28 Oct 2014
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3tb carb blocked??
Hello people been riding a 3tb to work recently but ran very low on petrol this morning (stuttered a couple of times).

Anyway made it to the petrol station opposite work and put some petrol in and then it started leaking. It's coming from a clear tube from the carb. I'm assuming this is an overflow?

Does this mean there is a blockage in the carb? Or an I going up the wrong street?

The bike starts and revs but still leaking (pretty fast).

Thanks
Rob
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Old 28 Oct 2014
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Overflow from carb, its not shutting on the needle. Or the screw for empty carb doesnt shut, is it underneath carb?
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Old 28 Oct 2014
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Yeah! It's underneath the carb and to the left hand side...
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Old 28 Oct 2014
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Quote:
Originally Posted by Rfothy View Post
Yeah! It's underneath the carb and to the left hand side...
Yes you have a screw there, take it out and put it back in, check for damage. If this dont help, remove carb and check inside on the float valve.
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Old 28 Oct 2014
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Thankyou people
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Old 28 Oct 2014
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I will suggest you remove carb, open up and take out the filter inside. Its underneath the screw under the float. Or you will have same problem after a while, check tank filter if its ok.
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Old 28 Oct 2014
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Quote:
Originally Posted by Mezo View Post
Its just a tiny piss ant grain of sand thats allowing the needle valve to stay open just enough to allow fuel to pass, nothing to panic about its common on any engine.

It happened because you drained the tank low allowing the crap to come through to the carbie, if you had an in-line filter that would have caught the crap.

You will need to remove the carb & remove the needle float valve filter as that will be full of shit now as will your bowl.



Mezo.

I did this today (with the AA man) outside work for about 3 hours. Now runs sweet and doesnt wee itself although i nee to adjust the idle I think as it doesnt idle without stalling.

Extra score when my foreman (boss) said he will still pay me for the time I was off work!
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Old 28 Oct 2014
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Quote:
Originally Posted by Mezo View Post
Quick fix, whilst fuel is pissing all over the floor get the handle of a heavy screwdriver or an extension of a socket set & tap (fairly hard) the float bowl, keep tapping firmly until you dislodge the bit of crap in the needle valve.

Mezo.
...is the right answer.

He means heavy and he doesn't actually mean fairly hard. He means hard enough to make you worry you are going to pull it out of the seats.

I had this problem when I installed a new float needle and seat in mine. I carried out "the procedure" and it was fine after.
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Old 28 Oct 2014
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Played round with the idle and wound it up a fair bit but the xt still cuts out after like 20 seconds. So going to replace the inline fuel filters this weekend and use the other bike for work.

Any other suggestions as to what might be at fault here?
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Old 29 Oct 2014
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Quote:
Originally Posted by Mezo View Post
I will add a caveat to this

You say 20 seconds,,,,the time it takes to empty a float bowl? is that just the engine ticking over? or revving the engine?

I forget now how long it takes to drain the bowl before the engine dies? anyone?

Mezo.
To drain the float bowl by turning the fuel tap off takes about 20 secs if riding under load, but if idling it takes several minutes.

Bob
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Old 5 Nov 2014
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Ok I have taken the carb out out and looked over everything and all looks good and very clean and gaskets look good.

Rubber inlets look good too.

Just need to work out where the 'jets' are, Would like a hard paper copy of a manual for this bike. Its all digital at the moment
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Old 5 Nov 2014
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Have you removed the filter inside?
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Old 6 Nov 2014
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Think I did I will open it up and check again
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Old 6 Nov 2014
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Ok looking at the needle float valve filter at the moment, sorry i thought you were talking about something else.

Right I have taken out the small screw/bolt thing and not sure how to remove the valve. Do I just pull it upwards? And the float arm bits will be in the way.

Appreciate the help alot by the way. The bikes in bits in my mums kitchen and she is not best pleased I havent fixed it yet! Haha
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Old 6 Nov 2014
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Quote:
Originally Posted by Rfothy View Post
Ok looking at the needle float valve filter at the moment, sorry i thought you were talking about something else.

Right I have taken out the small screw/bolt thing and not sure how to remove the valve. Do I just pull it upwards? And the float arm bits will be in the way.

Appreciate the help alot by the way. The bikes in bits in my mums kitchen and she is not best pleased I havent fixed it yet! Haha
Use a plier and pill the brass out, wiggle and pull. First remove the float, remove the pin holding it, pulling it out, wiggle and pull.
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