Question about 1995 Triumph Trophy 900

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Coolant Resovoir is boiling over.

If I run my Triumph for a while coolant begins to boil over and white smoke comes out of the run off hose. If anyone can help let me know, thanks!

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  • Stephen May 11, 2010

    Do you know if there is a thermostat installed, sometimes on cars, if they stop opening you get back pressure problems? I test car ones by hanging it in water and bring slowly to boil at about 90+ degrees you should see the valve open. P.S. water boils at 100 degrees Celsius.


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  • 53 Answers

Sounds like you have got a stuck thermostate. it will have to be replaced ,do not operate untill problem is repaired or you will cook your engine.

Posted on Mar 30, 2009

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My Honda Silverwing 600 is over hitting

Hi Nortey, and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat. See dealer.
4. Coolant pump or fans inoperative. See dealer.
5. Vent hose crimped.
6. Air in coolant.
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I have a 2001 r6 and its over heating. I changed the thermostat and its still over heating what should I check next.

firstly, is your fan coming on? Should kick'in between 103-110 max.

If no, then check you have no air trapped in the water system which will stop circulation and make your water boil. If the system is bled properly and still no fan coming in then check the fan switch.
If your fan is coming on and still overheating after a while then you could have a water pump problem. Worse case you have a blown gasket which can usually be identified by checking the oil for cream and will also produce continuous smoke from exhaust. If theres cream looking oil rather then brown/gold then poss head gasket or could still be water pump seals....

Oct 12, 2014 | 2001 Yamaha YZF-R6

1 Answer

2000 ZX9R Bike overheating and the coolant comes out of the reservoir top line.

make sure that the thermostat is working and opening to let the flow of water in the engine, if it's ok you should start it and let it warm up and see if the cooling fan starts when temperature reaches close to 98 degrees, is it doesn't and the coolant boils then you have to change the temperature sensor as it is faulty.

Jan 15, 2014 | 2000 kawasaki ZX-9 R Ninja

1 Answer

Coolant container boiling water

Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant.
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1 Answer

2001 r6 keeps pushing all the water out of the expansion tank and when hot does not want to run

Possibly has air in the coolant system causing the coolant to boil. You can flush the whole thing if your coolant is in need, but mainly open the radiator cap and shake all hoses to release air while adding more coolant. Also may be the radiator cap spring (maybe). I am not sure about why it will not start up... maybe a sensor will not allow it.

* I am not certified in anyway and have minimal knowledge, my 05 r6 had air in the coolant and would boil out of the overflow. Make sure you use distilled water to avoid corrosion.

Jul 29, 2012 | 2000 Yamaha YZF-R6

1 Answer

Cooling fans not coming on 2006 FZ1

It sounds as if you have an air lock in the coolant line. Bleed the coolant system and check that the thermostat works by doing a resistance check while the thermostat is in a jug, into which you pour boiling water. It should go "Short" when at boiling. Coolant in most bikes is usually kept at around 80-85 Deg C. I hope this helps

Mar 15, 2012 | Yamaha FZS 1000 Fazer Motorcycles

1 Answer

I have an aprilia mxv 450 crosser.had for 2 years from new.i have had an ongoing problem with overheating too quick from cold,boiling over instantly after a race,even in icy conditions.aprilia put new head...

when you say boils over do you mean dumping out the over flow pipe ? have you tried new radiator cap
sorry mate it seems like you checked everything but I have seen plenty of MX bikes come in from hard race and dump half their coolant on the floor through the over flow pipe as soon as they turn engine off its nearly always the radiator cap (pressure release) is to weak when this happens
thought it worth a mention but no doubt you checked already?

Jun 18, 2011 | 2009 Aprilia MXV 45

1 Answer

Fan only comes on at 100degres and turns of at 90 what should it run at

That sounds about correct, with the pressurized system this raises the boiling point to about 105 or more, and the fan is just to assist to stop it boiling , so if the fan brings the temp down to 90 and then stops, this would seem all is well.
If the bike is boiling before the fan starts, there could be trouble brewing, new cap, coolant and thermostat are a good start

Jan 20, 2011 | 1985 Honda VT 1100 C

1 Answer

In town my engine temp reach to 108 degree of centigrade.if this temp is harmful for engine,please help me.thankyou

Petrol engines like to run at or just below boiling point. The radiator is pressurised and that stops the coolant from boiling. I would not be happy if it got any hotter as I would worry that the coolant may expand too much and leak.
Try using less power on hot days when in traffic and keep moving the air through the radiator.
Hope this helps.

Nov 25, 2010 | 1998 Honda CB 1300 Super Four

2 Answers

Coolant tank

it is hidden between the engine/frame and your right rear brake reservoir

Nov 10, 2008 | 2007 Yamaha YZF-R6

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