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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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  #1  
Old 30 Jul 2006
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Fuel problem
Hi my xt 600 3aj seems to be not getting enough fuel at about 4500rpm. I want to remove the fuel taps to clean the filters.
I am traveling in Estonia at the moment and dont have any spare gaskets or seals and am worried that if I take the taps off the seals may be damaged and not be able to be re used is this likley to be a problem
Also on my other bike TTR 600 there was a small filter in the carb which used to get blocked causing fuel problems is there a filter in the 3aj carbs again dont want to take them apart unless necessary incase I damage gaskets.
Thanks
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  #2  
Old 30 Jul 2006
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Check first
If the problem is indeed the filters in the taps, check this first by pulling the hoses, opening the taps. If a firm jet of fuel comes out, this is not it.
Further, does the problem only manifest itself at 4500 rpm, and not above this speed, because at higher engine speeds the engine needs even more fuel, so your problem should be worse then.

The 3AJ also has this filter on the float needle seat. The gasket of the float chamber increases in size when wetted with fuel, and decreases when drying. So, when you remove it, just put in the sun to make it smaller to fiit again, or soak in petrol.

From the description of your problem I think it is something else. At what altitude above sealevel are you? It might be, if around 1000 m, that the compensation valve has opened already but overcorrects a bit.

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  #3  
Old 2 Aug 2006
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Hi Bolla,

Are you sure it's not just your air filter clogged up.
It's easier to clean an air filter that chase possible fuel supply problems.

Good luck

Mark
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  #4  
Old 2 Aug 2006
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Hi and thanks for replys
The problem seems to appear if travelling at 4500 for more then about 20 minutes some times it will get better if I increase the revs but only for a little while then probem wll continue at above 4500.
The last time it happened I had filled up with fuel, started riding when problem started again I stopped filled up again. I had used 7 litres of fuel and every thing seemed ok again for about 60km .
I will cheak the air filter and also the breather in the fuel cap tommrow I have a tank cover and tank bag fitted and the fuel cap is very tight the cap is also half coverd by the tank bag.
I am riding at pretty much sea level at the moment and is not a problem to keep the speed down for a few days .
Thanks John
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  #5  
Old 2 Aug 2006
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I dont think this is a fueling issue. Its too RPM specific.....

What exactly is the problem, if the bike losing power or cutting out ??

What gear or throttle positions does the problem occur and what helps the problem ??

remember.... Throttle position is NOT rpm.

It sounds like a carb, tuning issue to me which suggests your feeling of "fuel starvation"
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Old 2 Aug 2006
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Quote:
Originally Posted by tedmagnum
I dont think this is a fueling issue. Its too RPM specific.....

What exactly is the problem, if the bike losing power or cutting out ??

What gear or throttle positions does the problem occur and what helps the problem ??

remember.... Throttle position is NOT rpm.

It sounds like a carb, tuning issue to me which suggests your feeling of "fuel starvation"
The bike does not cut out but will just miss a beat like it is coughing, some times it will clear if I go past 4500 but only for a little while.
There will be less power if I want to over take slower traffic, it will have less power and hesitate when I increase the throttle but if I stop and put a bit more fuel in it seems ok for a while so not sure if its petrol or if the engine just cools down a bit when I stop to refuel or a problem with the breather in the petrol cap .I had a look at the petrol cap and all seems ok.
It allways happens in top gear after I have been at constent speed for a while.
Thanks john
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  #7  
Old 2 Aug 2006
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hmmm !! Hard to diagnose this one !!

take the cap off and check the breather is clear... give it a blow through to check.

Pull off the fuel line to the carb and see if the fuel flows freely too, theres no need to take the taps off unless the fuel isnt flowing.

What your suggesting does sounds like a possible fuel lock due to vacumn.

How long has this problem been going on for ?? Are you running the correct grade fuel ??
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