Hawat
New Member
Hello,
I just bought a used 2009 FZ6-S and rode it home for about 300km.
It was a very hot day (about 36 degrees C ambient) and I noticed that the coolant temperature reading kept creeping higher, slowly but steadily regardless of rpms and speed. It increased to 114 C and I heard the fan kicking in (fan works), but didn't really cool the temp down.
Even when I was coasting in 6th gear, low RPM the temp kept creeping higher until it reached 120 C and the overheat warning came on.
I stopped immediately and let it cool down. However there was no indication that the bike was really all that hot .. no bubbling in the overflow tank, no steam or coolant coming out etc.
After about 20 mins I opened (very carefully !) the radiator cap and the coolant was full and only luke warm, although the temp reading still showed 72 C. I verified the pump working and the coolant is very nice and not contaminated.
So I kept on going and soon the temperature went up to 115 degrees again. So I decided to pull in the clutch and let it coast down a hill to let it cool in idle, and the temp jumped almost immediately to 124 C and the overheat
warning came back on. I couldn't really pull over, so I let go of the clutch in 6th gear and the rpm went back to about 4500 rpm and the temperature reading changed almost instantly to 102 C ! Like within 2 seconds. And the overheat
warning disappeared.
I then stopped for fuel and for the rest of the trip the temperature never exceeded 102 C - but then the sun was down and it was much cooler ambient temp.
I contacted the former owner and he states he never had any problems with it.
Now what do you guys think ? I dont think the coolant temp could change from 124 C to 102 C within seconds ? Faulty coolant temperature sensor ? Corroded wiring / contact issues ? Or is the 124 degree reading correct and there is another coolant problem (i.e. thermostat ?)
Thanks.
I just bought a used 2009 FZ6-S and rode it home for about 300km.
It was a very hot day (about 36 degrees C ambient) and I noticed that the coolant temperature reading kept creeping higher, slowly but steadily regardless of rpms and speed. It increased to 114 C and I heard the fan kicking in (fan works), but didn't really cool the temp down.
Even when I was coasting in 6th gear, low RPM the temp kept creeping higher until it reached 120 C and the overheat warning came on.
I stopped immediately and let it cool down. However there was no indication that the bike was really all that hot .. no bubbling in the overflow tank, no steam or coolant coming out etc.
After about 20 mins I opened (very carefully !) the radiator cap and the coolant was full and only luke warm, although the temp reading still showed 72 C. I verified the pump working and the coolant is very nice and not contaminated.
So I kept on going and soon the temperature went up to 115 degrees again. So I decided to pull in the clutch and let it coast down a hill to let it cool in idle, and the temp jumped almost immediately to 124 C and the overheat
warning came back on. I couldn't really pull over, so I let go of the clutch in 6th gear and the rpm went back to about 4500 rpm and the temperature reading changed almost instantly to 102 C ! Like within 2 seconds. And the overheat
warning disappeared.
I then stopped for fuel and for the rest of the trip the temperature never exceeded 102 C - but then the sun was down and it was much cooler ambient temp.
I contacted the former owner and he states he never had any problems with it.
Now what do you guys think ? I dont think the coolant temp could change from 124 C to 102 C within seconds ? Faulty coolant temperature sensor ? Corroded wiring / contact issues ? Or is the 124 degree reading correct and there is another coolant problem (i.e. thermostat ?)
Thanks.