Question about Yamaha YZF-R1 Motorcycles

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Yamaha R1 2008 Coolant pushing up through radiator cap when bike warming up. Also noticed coolant on left side of engine coming through casing

Coolant pushing up through radiator cap when bike warming up

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Sounds like a blown head gasket, it is a bit hard to say what is wrong when I cant see the bike. also check the oil if it has water in it.
Good luck.

Posted on Mar 24, 2014


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Posted on Jan 02, 2017


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How do I check the coolant level?

The bottle is listed here, you just have to find it?

I found this

To change the coolant - remove the driver's seat, fuel tank, all four cylinder side covers, and the right side cover (color-matched cover under driver's seat). Prop the motorcycle so that it's as close to level as possible, but will not tip over in either direction. Place a 24"-30" drain pan slightly forward of the center of the engine - if you do not have a large drain pan, a small one placed under the drains individually, IN THE ORDER LISTED, will work. Siphon all coolant from overflow reservoir under the side cover OR remove the center cover, remove bolts holding the reservoir to frame, invert the reservoir to empty, and reattach the reservoir to the frame.

Now, remove the radiator cap and the drain plug at the bottom of the radiator, allow the radiator to empty. Remove the plugs at the lower portion of each cylinder in no particular order, drain fully, then remove the drain plug from the bottom of the water pump (the large protrusion beside the front right driver's footrest). Once all drains have ceased dripping, reinstall the radiator plug (torque to 18 ft.-lb., 25nm), all four cylinder plugs (seat firmly in the drain holes), and the water pump plug (torque to 32 ft.-lb., 43nm). Fill the reservoir in the rear, then fill the radiator as much as possible, cap, and run the engine for 3-5 minutes to warm. Remove the radiator cap, check the radiator and refill, repeating until there is no air beneath the radiator cap when it is removed.

Reinstall the body panels, tank and seat, and return the bike to its' normal parking position on the kickstand. If additional coolant is needed it will be added to the reservoir - check frequently for about the next 100-150 miles.

May 03, 2015 | 1996 Yamaha Royal Star XVZ 1300 A

1 Answer

Problem with 2001 Yamaha R6 Coolant

Most likely a blown head gasket. Exhaust gas is blowing past the gasket and into the cooling system. It will pressurise the cooling system and push the coolant into overflow bottle. You might notice that after riding the bike for a while and then leaving it to stand for a few minutes, it will push coolant back into the cylinder and you will get a big puff of steam out exhaust when you start it.
Best way to check is to do a compression test. Need to remove spark plugs and and screw a compression tester into the hole. Crank the starter and you will see the gauge go up in 3 or 4 strokes. Should be about 224 psi for a new stock motor. Repeat test for remaining 3 cylinders. Pressure should be 90% of that figure (201) and should not be more than 10% different from highest to lowest. Probably find one cylinder is really low.

Oct 29, 2012 | 2000 Yamaha YZF-R6

1 Answer


Hi, Rick 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 and needs bleeding.
7. Engine idling too long or bike moving too slow.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Help Grayracer or anyone Coolant leak from overflow tube YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

May 13, 2012 | 2001 Yamaha YZ 426 F

1 Answer

Temp gauge comes on as soon as i start my bike. also the coolant fan will not run. what should i check to fix this problem?

Do you have coolant? The coolant reservior is located behind the left side crank case cover. If you need to add coolant, be sure to use a coolant that is compatible with an aluminum radiator. Alcohol based coolants will destroy your radiator in short order. While you have the left side crank case cover off, check the fuses in the fuse box just aft of the coolant reservior for the fan problem.

Apr 30, 2011 | 2002 Suzuki VL 800 Volusia

1 Answer

I have a 2004 yzf 250 it starts to overheat when it warms up

Hi,,,,check your coolant level,,,,also might have an airlock,,,take off the radiator cap when the bike is cold and start it up let it warm up and make sure there is coolant to the top of the radiator.

check that the radiators are clean from mud ect,that blocks airflow.

Mar 23, 2011 | 2004 Yamaha YZ 250 F

1 Answer

Where do I check the coolant at on my 1990 yamaha FZR 1000

There should be a coolant overflow bottle behind the side cover on the left side of the bike, near the seat. This needs to be filled to between the low and high marks. You also need to ensure that the radiator itself is full. The cap is on the top of the radiator on the right hand side of the bike, underneath a plastic cover from memory. Fill this right to the top.

All this needs to be done when the bike is cold to get the correct settings.

Nice bike by the way, there aren't many other bikes that perform so well regardless of what kind of riding you do on it.

Feb 22, 2011 | Yamaha FZR 1000 Motorcycles

2 Answers

Yamaha YP250R X-MAX -2008 overheating.

Howdy: If the air temp is hot and raining the engine will heat up somwhat but not to the hot level. There is a temp sensor in the radiator system (refer to your manual) that may be stuck. Do a flush and pour in new coolant. Also when engine is cold undo the radiator cap and see if the coolant starts to move as the engine warms up. If not water pump rotor may be loose or broken and not pushing the coolant thru the engine. Try it - Good luck and ride safe - Doug

Dec 09, 2009 | 2008 Yamaha MT-03

2 Answers

Dripping coolant and pipe glowing red

The header pipe will glow red when you run it on choke, during warm up. This is normal while sitting. You shouldn't see that one you start riding it though.
The coolant drip could be just a dirty or failing radiator cap. My bike will push a little out if I completely top it off full. Hope this helps.

Jun 20, 2009 | 2003 Yamaha YZ 450 F

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