Quote:
Originally Posted by mw999
Checked radiator and it was full to the brim. Checked level was mid way between upper and lower levels in expansion tank and left engine ticking over.....Left fan kicked in at about 103, right fan at about 105. They didn't seem particularly effective and didn't appear to be pulling much air through but both were on. Temp continued to rise but not quite as fast.
After about a minute the expansion tank relieved at 107. Temp then dropped to 103 then rose again....and tank relieved again. Temp seemed to stabilise at 107 / 108. I increased revs a little to just above 2000 and saw temp drop to 103 virtually immediately.
Left it to tick over again and it dropped another small amount of coolant onto my drive!!!. Got a bit nervous then because there had been quite a lot of water dropped - so switched engine off. Fans stayed on till about 101. Waited for it to cool then found I had to put in 250 millilitres of water just to get it back to the minimum liquid level.
|
Everything you said above is normal until you had to top up again. I have my bike serviced by the same dealer (I think) and have had the same problem with water being dumped after getting quite hot, I think that they always over fill when they service.
The temperatures that you note are perfectly normal and it is also normal for the temp' to drop when you pick up the rev's. There is an optimum speed for the coolant to pass through the rad', too slow and the temp' rises, speed it up a little and the temp' reduces but then will rise again as the coolant passes through the rad' too fast to be cooled. I often do this in traffic, allow the engine to tick over but then, when the temp' gets to around 110, pick the rev's up to around 2000 until the temp' drops to 105 or so.
The problem that you describe does suggest the rad' cap being to blame. The system is "overpressurising", this could mean that it is overpressurising due to the headgasket failing but it could just as easily mean that the pressure is normal but the rad' cap is weak and "tripping out" at too low a pressure.
Sorry that this has been a bit late for you to sort it out yourself but, on a different thread, I have given Riders a vote of confidence and hope that you get the same good service that I did.