Join Date: Apr 2005
Location: SW Washington State
Leads to several more questions then, how long does it take of idling to get to 4 bars? Extended idling of 5-10 minutes or a bit longer would be normal. In what kind of conditions does it hit 4 bars, in heavy traffic stop and go and high temps this is normal.
Is the system filled with water and coolant? With no more than 60% antifreeze, less antifreeze makes for better cooling than more. The system only holds about 4.6 pints of coolant including the reserve tank.
Has the cooling system been serviced, coolant replaced? If so was the system bleed?
Is the radiator fins clean and free of obstructions like insects, mud and othe crap?
Has the radiator cap been tested for pressure?
Has the temp sender been tested for accuracy?
The thermostat operating properly and opening when it should?
The above tests are simple tasks using a thermometer or multimeter and a pan of heated water.
And is the fan working properly? and the sender for it turning on accurate so it is coming on at the right point.
The final test involves pulling the water pump impellor and inspecting it and the bearing, much more involved the the preceding components tests and if no noise is noted or any evidence of oil in the coolant or water in the oil probably isn't indicated.
My bike with an '03 1000 with 44k miles will normally run at two bars, and in heavy traffic at slow speeds it will normally hit 4 bars but a friends '04 will run at normal and same conditions as mine at 3 bars and will go to 4 about the same time. We ran the above tests on his bike and found nothing out of specificatons so we put it down to it being the slower blue than my yellow.
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