Rate of Coolant Flow

[1975FA]

My 08 RTX has been running warm. When I pull the radiator cap and look into the radiator how much movement should should I see in the coolant. On some engines the coolant is rolling right through. On my nytro there is flow but it doesn't move real fast. What do you guys see when you check yours? I'm trying to determine if somthing is pluged.

 

[09nytro]

Never looked

 

[Dimebag]

09nytro, How in the world would that answer help him out in any way?

However, I do see some movement, but its not like its flowing really fast.
I would expect it to flow faster.

Does it overheat all the time, or only when its really hardpacked?

 

[raginyamaha]

Ice scratchers or a tunnel cooler of some sort. Mountain tech just came out with a new tunnel cooler tHat looks slick.

 

[yamadoo]

Flow is one part of moving the heat from motor to exchanger one other is the coolant fluid.
In 06 many were finding the coolant to have to much anti freeze and less able to transfer heat. The solutions tossed around were to dilute the fluid until tested to 30-40 below or some added water wetter both reported improvement
I am not sure how these water pumps could work to have some but less than normal flow. Hopefully some one will chime in

 

[1975FA]

We are trying to determine if there could be a loose piece something in the system that blocks the flow. After 7-8 miles it is getting hot, I'm working with my dealer's mechanic on this one. The light comes and goes a few times then stays on. I was hoping a few of you guy's could pull your radiator cap and have a look.

 

[LSXM3]

The nytro does not flow a lot of coolant to begin with and the impeller for the water pump is made of plastic, with that being said it is entirely possible to have the plastic impeller fail, although it is highly unlikely as i have never seen one fail personally. I would start with checking the strength of the coolant as someone else stated as it is mixed very strong from the factory and antifreeze does not cool as well as water does. I would also pressure check the radiator cap to insure it is in fact holding the pressure it is supposed to hold.

From there my only suggestion would be that it could possibly have a faulty head gasket from being overheated in the past.


I really need more info on this like has anything been added or changed on the sled's cooling system or has the sled been previously over heated, where any modifications done to the sled that could have adversely affected the temp at which it runs?

 

[1975FA]

The nytro does not flow a lot of coolant to begin with and the impeller for the water pump is made of plastic, with that being said it is entirely possible to have the plastic impeller fail, although it is highly unlikely as i have never seen one fail personally. I would start with checking the strength of the coolant as someone else stated as it is mixed very strong from the factory and antifreeze does not cool as well as water does. I would also pressure check the radiator cap to insure it is in fact holding the pressure it is supposed to hold.

From there my only suggestion would be that it could possibly have a faulty head gasket from being overheated in the past.


I really need more info on this like has anything been added or changed on the sled's cooling system or has the sled been previously over heated, where any modifications done to the sled that could have adversely affected the temp at which it runs?

I bought this sled late last winter with 5000 miles on it. I ran it a little bit and was loosing coolant slowly. The light would come on but it didn't get warm enough to shut off. This fall I presure checked the cooling system and found a leaking water pump seal. I rebuilt the waterpump, the impeller looked fine. I added a mtx tunnel heat exchanger. I also put in a new thermostst. I bought 50/50 premixed coolant. I bled the system acording to my service manuel. The light came on after 3-4 miles of running. I pulled the new thermostat and checked it in boiling water with a thermometer. It was fine. I don't smell antifreeze in the exaust when I fist start the engine after it has sat a while, the overftow bottle isn't scummy and oily, and if you leave it running with the cap off the radiator bubbles don't work there way up. The dealer I took it to ran it up the bank to bleed the system, I hadn't done that. It seemed to help, now it goes 7-8 miles for the light to come on. The yamaha tech support also suggested raising the rear of the sled and bleeding it through the heat exchanger drain plug. The mechanic and I were discusing just how much flow we should see in the radiator. The mechanice did notice a few drops of ainti freeze seemed to keep reapearing on the lower left corner of the radiator. There may be a pin hole leak or crack letting the system suck air in and air locking the system. This is an odd case.