Question about 2005 Honda CBR 125 R

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Coolant system problem

I have a honda CBR 2004 model.. and the temperature gauge seems to increase to red even on the smallest of journeys. i know that the gauge is not broken so im wondering if its the thermostat, or pump.. im not sure what to do about it. does anybody know what could be the problem?

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  • chrisentwist Feb 12, 2009

    ye ive already checked the pipes and they seem to be cool, i was tols the thermostat could be blokd or something. thanks. i just hope the engine doesnt seize up on me as ive got my practical tomorow lol. ye im not too sure where abouts the water pump is, is it near the thermostat?



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On my cbr i had a problem w/ the cooling fan. so check to make sure it works. then your going to need to see if the radiator hoses are both warm, if not it needs a thermostat. the water pump is expensive and not likely to break. but, it is possible. my bike needed a thermoswitch, which turns the rad. fan on and off.

Posted on Feb 12, 2009


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Hi, Anonymous and the usual suspects, are:
1. Blown instrument fuse.
2. A bad ground in the gauge circuit.
3. Faulty wiring before or after the fuse.
4. Faulty dash wiring harness connector.
4. Faulty wiring or connector between the fuse and sensor.
5. Faulty wiring or connector between the sensor and gauge.
6. Gauge sensor has failed.
7. The gauge has failed.
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According to

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
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Coolant Temperature Sensor printpage_icon.gif

0900c152801bfc38.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
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Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.

0900c152801bfc39.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown

0900c152801bfc3a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

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