Overheat i can not trace if the problem is radiator or water pump, how can i identify what is the problem of my bike? can you give me an idea thanks

If your vehicle's radiator is overheating and there are no visible leaks, it is possible that the problem could be caused by a faulty thermostat or water pump. These components are responsible for regulating the flow of coolant and water through the radiator and engine, and if they are not functioning properly, it can cause the engine to overheat.
To determine if the thermostat or water pump is causing the overheating issue, you will need to perform some diagnostic tests and checks. Here are a few steps you can follow:

1. Check the thermostat: The thermostat is located in the engine and controls the flow of coolant through the radiator. If the thermostat is stuck in the closed position, it can prevent the coolant from flowing and cause the engine to overheat. You can test the thermostat by removing it from the engine and checking it for proper operation.
2. Check the water pump: The water pump is responsible for circulating the coolant and water through the radiator and engine. If the pump is not functioning properly, it can cause the engine to overheat. You can test the water pump by removing the drive belt and attempting to turn the pump by hand. If the pump is seized or not turning smoothly, it may need to be replaced.
3. Check the coolant level: Make sure that the coolant level in the radiator is at the proper level. If the coolant level is low, it can cause the engine to overheat.

If you are unable to determine the cause of the overheating issue, it is recommended to have the vehicle inspected by a mechanic who can perform a more thorough diagnostic test and identify the root cause of the problem. They will be able to recommend the appropriate repairs to fix the issue and prevent further overheating.

Check your pump and impeller, then trace water inlet hose from back to front, possibly have a flush kit thats missing the cap?

The brown substance in the radiator and overflow indicates 2 things:

1. Rust in the coolant indicating the system needs to be flushed

2. Stuck thermostat making the rust back up into the overflow

If the car didn't overheat when it shut down, the problem is probably a fuel related issue. If there was an overheat when it shut down, you will need to identify whether you have a bad water pump or thermostat.

change thermostat

Things to check 1st. If it overheats after riding for a while, check the air filter. If the filter is not sealed properly, air will get in between the seal and the airbox causing the bike to overheat. Other possibilities on a bike that old would be clogged radiator tubes(replace), bad water pump(replace impeller)
Please comment

so there is block in the radiator. does the water overflows from radiator mouth? then you have to give your radiator to nearest radiator service centre, clean it! cost you around 50$ or something! better give the vehicle to a recognised garage and check any gasket are worn out. better make it fast, if you run your vehicle with overheat, you know what will happen! Thanks

It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water through the engine block and cylinder head and back through the radiator. In the radiator the mixture is cooled when air passes over the fins of the radiator. This is accomplished by driving or a mechanical/electrical fan when stationary. The water pump also circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving.
I hope this helps and good luck!

hey, just finished huge ride across europe on one. Look at radiator and water pump, check oil levels and type of oil used. sounds like a blockage in water pump and or, radiator or hoses. Check electrical fan is running after bike stops? If fan is not working the bike will over heat as it requires fan to draw air trough the radiator constantly. Terry Tourer Australia

Sounds like to me it would be your water pump before a heater core. When the water pump goes out, it stops pumping the coolant through the system which is what would cause it to still overheat even with the thermostat out. Change the water pump and you should be good. Let me know if you have any other questions. Thanks for using FixYa!

Sounds like an airlock. When it fell over an air bubble would've gone to the highest point of the cooling system, & when you picked it back up the air gets trapped, if it gets trapped near the thermostat it will send the computer a false reading & fans wont turn on causing an overheat. Give the cooling system a flush. Remove lowest cooling system hose you can find I think its the water pump hose, & remove the radiator cap all the coolant will drain. Put your garden hose in the radiator turn it on & start your bike, run the hose through it for about ten minutes or untill the water coming out of the hose you removed runs clear then shut the bike off. Put the water pump hose back on, clamp it up, & fill the radiator 50/50 water/glycol. Leave the radiator cap off start the bike & get it to normal operating temperature, as it warms up air will rise to the radiator cap & the coolant level will drop just top it up accordingly. Once the bikes warmed up & bubbles stop rising,  put the cap back on & take it for a ride. Hope this helps!