Question about 2000 Yamaha YZF-R6

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Losing water water starts spewing out of what i guess is an overflow tube when my 2000 r6 gets up to 200 degrees. why? have already replaced thermostat,radiator cap,upper and lower hoses.

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  • jeremy_odom Jun 28, 2009

    coolant only coming out of tube. doesnt seem to be boiling though.

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If your temperature gauge is correct and you're only at 200 then I suspect the radiator cap is either not tight or possibly the radiator has something interfering with a good seal. Proper coolant should not boil until well past 220 degrees, probably closer to 250 (under pressure in your system). Is your reservoir filling up and then overflowing or are you just getting coolant out of the tube?

Posted on Jun 28, 2009

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Won't start


Hi, Anonymous and the usual suspects are:
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2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
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12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.r6messagenet.com/forums/r6-maintenance-technical/117461-wont-start-without-throttle.html
http://www.r6-forum.com/forums/57-garage-mechanical-help/142147-2000-r6-wont-idle.html
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Jan 08, 2014 | 1999 Yamaha YZF-R6

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Radiator is leaking from top,does loose cap causes lost of water


yes the cap has to be tight it will loose water or a crack in it or the overflow tube by the cap is bad

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Hi, Janetthurlow and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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1 Answer

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Hi, Mckinneym697 and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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2003 2004 Yamaha YZF R6 Service Manual R6 Moto Data Project
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http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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I have a 1997 BMW 328i- Left it idling in the driveway for about 10 minutes, and it over heated, and started spewing rad. fluid out of overflow tank- let it cool down, took off up the road, and it...


yes, if the water pump is bad, input hose will be hot output hose will be cool, but that also could mean a bad thermostat.

a way to see if the water pump is pumping coolant is to remove the bleed screw on the thermostat housing and see if coolant spews out.

But it overheats. may as well change out the water pump and get rid of the original plastic impellers. While you're there, replace the thermostat with a 12 degree cooler one and drill 2 3/16" holes 180 degrees from each other in the thermostat.

2.8L motors are sensitive to overheating. you can bust a head gasket this way in no time. Also warp that long cylinder head.

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2 Answers

The water pump was replaced,thermostat replaced,car spews water from the overflow tube and emptys the water from the engine!


Probably either head gasket blown, or crack in head or block. Have you had the engine hot lately? Look for white smoke out of exhaust that will confirm head gasket or cracked block or head.

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1 Answer

MY 2006 yz250f is overheating too i think... i had a smashed left radiator and ever since i replaced it, my coolant spews out of the overflow tube when i really get on the gas. if i just putt around it...


It's possible your head gasket needs to be replaced. It sounds like combustion pressure is being introduced into the cooling system to me and the head gasket would be the logical place for this to occur.

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1 Answer

Water bypassing radiator cap and exiting via overflow tube


as the problem started after the new cap was fitted
I suspect that the new cap was not correct for the application
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