Question about Yamaha XS1 Motorcycles

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I have 1979 XS11 special. Intermittently when started fuel pours out of the air box. If I let the bike sit for a while and restart it, the problem usuall disappears. When leaking, it sounds and feels like one or two of the cylinders are not firing, but I'm not sure of this. Naturally when I take it for service I can't reproduce the problem. Any Ideas?

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First check your oil level. If it is too high , your engine is full of gasoline. You will need to change your oil, check that the air filter is not saturated with oil (if so replace it). You may have a bad vacuum diaphragm on your petcock that is leaking gas into the motor. You can rebuild the the petcock with a K&L rebuild kit or replace it with a new one. You may have a sunk float or a worn or stuck float needle. Take the carburetors apart clean and inspect the components and replace as needed. Unfortunately, even a perfect motorcycle can have a float needle stick and fill the engine with gas forcing you to change your diluted oil. the only answer for this is to always turn off your fuel petcock when not riding. Since your problem does not necessarily sound like a bad diaphragm but more like a sticking float needle you could try running some Chevron Techron through the fuel system just in case the carburetors are just a little gummy/sticky and that is the cause of the problem.

Posted on May 19, 2011

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It may be running ridiculously rich or the float in the carburetor is stuck open and pouring fuel into the cylinder while it sits. Drain the oil and if fuel is in it, you probably have a carb issue. Getting oil in the air filter box is not unheard of because a hose connects the crankcase to the breather box to let unburned fumes back into the cylinder. I'm not familiar with this bike but I've known some bikes had a tendency to cough up oil into the air intake if you ran it wide open on the throttle. The older big displacement kawasaki vulcan cruisers come to mind.

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Hi, Karin and the usual suspects are:
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No. That's the short answer. The long answer is that when the bike has sat for any length of time, over three months, say, the gaskets and O-rings will get dried out. Another problem is that on the older models bike, the rubber is very susceptible to ethanol, which will destroy those parts. Another problem is that after gasoline has sat for any length of time, it goes bad and will not burn well, if at all. Another problem is that when fuel sits for a long time, it creates varnish on the surfaces it touches, which is not so bad for the walls of the float chamber, but plays Old Harry with metering jet orifices, plugging them or restricting them, thus creating an overly lean fuel mixture. another problem is that if the gas tank has sat less than full, the less full the worse, because a fine rust forms on the interior wall of the tank, and therefore the fuel filters get clogged, and replacing fuel filters twelve times still won't clear the rust -- you have to dismount the tank and take it to a shop for clean up and having a protective coat sprayed onto the interior of the tank. As far as the fuel hoses, they all have to be replaced with a rubber or other material which will stand up to ethanol. I'd really like to have a 650, but there is a lot of work in resuscitating a motorcycle which has been in dead storage. For instance, you probably have varnish build up on the piston rings, which is why the engine doesn't turn over. When I have had this problem, sometimes fuel additives such as Sea Foam or Chemtool 16 or Marvel Mystery Oil will help free the pistons -- squirt a couple of ounces into each cylinder through the spark plug holes and let the bike sit over night, then try turning it by hand again. You can try this method for a couple of days. If it doesn't work, you'll probably have to pull the pistons and overhaul them and the inside of the cylinder walls. Good luck.

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I guess the fuel might not be pouring in to the float chambers faster enough.
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Check the pet- c o c k too.
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