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650 Boiling

Tamas

Tamas

Joined Nov 2012
170 Posts | 0+
Transilvania
Hi guys!

So yesterday I was riding in the woods in my area and I stopped on a hill top to take some pictures when I heard the water in the engine boiling. I wasnt riding hard or anything, just normal cruising. My question is can this be caused by fuel mixture?
The wheater was around 29 Celsius, elevation 600 meters over sea level.

Cheers, Tom
 
the coolant should only just cover the core. this is 80% of the problem= over filling with coolant.

after that you have the head gasket.

then you have the impellor falling off the end of the water pump shaft because the circlip fell off first!

regards

Taffy
 
Ty taffy.

I will check the impellor as soon as I get home. What about the headgasket? How can i tell If that is causing the problem?

Cheers, Tom
 
So the story goes like this. I didnt have any antifreeze home so I put water in the radiator and went for a ride. I wasnt riding hard just normal 3rd and 4th gear cruising, outside temp 28 degrees celsius, and when I stopped I heard the water boiling and it seems it was coming from the engine not the radiator. Waited for it to cool down went home and it did the same. It seems that if I start it, the engine block becomes hot before the radiator is even warm. I checked the water pump and it is fine. Dunno what to do. I fettled with the mixture screw, making it leaner and richer and nothing makes the slightest difference.
Pls help.

Cheers, Tom
 
Ruger said:
That sounds very much like a thermostat stuck in the closed position.
Click to expand...
No thermostat in either of the bikes in this signature line. I would recommend starting with a proper fill of coolant. Make sure the cooling system is properly bled, making sure there is no air trapped in the cylinder head cooling passage. There is actually an air bleed screw located where the exhaust headers attach to the head. It is a real pain to get to. You can fill the radiator and then lay the bike down on it's side for a minute (can't remember which side is more effective, I would do both). This should help burp any air trapped in the system. Recheck the coolant level and fill as taffy suggested. If that does not work I have many more suggestions.
 
Another thing is that the impellor seems to be a different type than the one on my 2003 motor. This one is pink and seems to take up more space, it almost touches the walls inside the water pump body, the 2003 model is green and smaller. I don't know if this was a change made from 2002 to 2003 or it is aftermarket.

I will do the things you guys recomended and will get back with what I find.

Cheers, Tom
 
Are you certain that it was the coolant you heard boiling? I bet that what you heard was recondensed fuel bubbling in the fuel cap vent hose.
 
Never thought of that. I need to check that out. I guess if that is the case I just release the pressure from the tank and the bubbling should stop?

Cheers, Tom
 
Tamas said:
Never thought of that. I need to check that out. I guess if that is the case I just release the pressure from the tank and the bubbling should stop?

Cheers, Tom
Click to expand...
There should be no pressure in the tank. Thats what the vent hose is for.
 
Yup, I just assumed that maybe the vent hose is clogged.

Cheers, Tom
 
The fuel in the tank gets pretty warm due to the close proximity of the exhaust midpipe to the tank. On my 2011 FE570S there's maybe only a 1/4 inch between them. Hot fuel is a well documented problem here and there are several solutions that include wrapping the midpipe, putting reflective material on the bottom of the tank, and putting insulative material on the bottom of the tank.

Those solutions will take a little work, but diagnosing whether you have the problem is really easy. All you need to do is replace the black rubber fuel cap vent hose with a clear plastic fuel line of the appropriate inside diameter. That done, you will be able to see what's going on inside the vent tube even while you're riding.

Some have described it as "boiling fuel." Naaaaa. All that happens is that the heat in the tank causes fuel vapors to outgas through the valve in the fuel cap like they're supposed to. Once in the tube the fuel vapors cool and condense back into a liquid, and you'll get a quantity of liquid fuel in the tube that bubbles because additional fuel vapors are continuing to come out of the fuel cap vent. It looks like you have boiling fuel in the vent line, but it's just fuel vapors bubbling through liquid fuel.

You can't see what's going on if you continue with the black rubber vent hose, but you can sure see it with a clear fuel line in its place. I got some blue tinted fuel line at Cycle Gear. It looks good on the bike and it visually tells me how hot the fuel is. I am willing to bet that this is the issue here.
 
The crux isn't the model year, it's how close to the fuel tank the exhaust system is. I am not intimately familiar with every model year of Husaberg, I'm just trying to offer help from the experience I have had with my Husaberg.
 
Just saying the fuel boiling issue is related to the FI bikes. Never heard of a pre 09 bike actively boiling fuel in the tanks. Coolant boiling in pre 09 bikes without a fan kit is fairly common, especially the 650's. I have a lot of personal experience trying to keep 650's cool while riding single track. Trying to compare the 2 different bikes is like apples to oranges. There are virtually no fixes that cross between the 2 generations.
You info is good, it just does not pertain to the posters issues.
 
The fuel in my 550 occasionally boils. I can take the cap off and watch! It happens often enough not to bother me. Usually when theres not much fuel left. Not sure how the yz's deal with this issue with wrap around exhaust. It must happen to them a lot.
 
I didnt have much time this weeked to work on the bike but I did try to figure out if it was the fuel boiling or not.
I fired it up, let it run hot enough so I couldnt put my hand on the radiator anymore, and just as I stopped it, a couple of seconds went by and it started burbling. The liquid remaining around the cylinder starts to boil after the circulation stops. I can feel the water boiling if I put my hand on the rubber hose coming out of the engine block. Also there is a fair amount of liquid missing since I put just enough to cover the cells and now it doesn't cover them. Im guessing its boiling the liquid while riding as well.

Cheers, Tom
 
sounds like the head gasket is gone and the system is pressurising. at a guess it is your head gasket.

regards

taffy
 
Finally got around to spend more time with my baby :). Changed the impellor, put it over from the other engine, filled it up with proper coolant and went for a ride. Just got back from the forest and all seems well. It didnt boil after I stopped, and no coolant was missing. Now it was either the impellor or the fact that I was running on water to blame???!!! It'll probably remain a mistery but Im just glad it's solved. Need to get a new battery that's for sure, the e-start eats it up after one push of the buttton :). I did check if pressure was building in the radiator, I ran the engine with the radiator cap on and the rubber hoses where soft, so no pressure there, also ran it whitout the cap on and no bubbles where coming up in the liquid, also the liquid is really clear, no oil stains in it.

Thanks guys, Tom
 

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