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zzr250 overheating prob
Posted: Tue Aug 26, 2008 8:34 pm
by Cwidova
hey all, a friend of mine has a zzr250 which overheats and also engages the thermo randomly....we have changed the fan switch, radiator cap & checked all the wiring but nothing helped....the bike always overflows water and runs hot as well as engages the fan whenever it feels like it!!!! for the time being we have bridged the switch so that the bike doesn overheat(according to the gauge) but we don't really want to leave it like this as it probably not good for it.......is there anything that iwe hae missed or anyone else had a similar sort of problem??
Re: zzr250 overheating prob
Posted: Wed Aug 27, 2008 8:04 am
by cookeetree
Flushed the radiator?
Re: zzr250 overheating prob
Posted: Wed Aug 27, 2008 9:14 am
by Cwidova
yeah the radiaor has been on and off a few times and we flushed it out one of the times......we ran fresh water through the engine while it was off as well......lots of crap in there but the problem still there
Re: zzr250 overheating prob
Posted: Wed Aug 27, 2008 10:10 am
by P4nza
CHANGE the radiator itself
Re: zzr250 overheating prob
Posted: Wed Aug 27, 2008 11:35 am
by Cwidova
the radiator is in pretty good nick.....no cracks, leaks & it flows well......when the fan working as it should there no problem at all....it is only when the fan fails to kick in at the right time the bike can't get cool enough!!!! when the fan "hard wired"(bypassing the switch) it stays under operating temp.....
Re: zzr250 overheating prob
Posted: Wed Aug 27, 2008 12:33 pm
by Six Addict
would the fan not be connected to a thermostat??
ie if u put it thru the thermostat but its buggered then the fan will never know its hot enough, but when u hard wire the fan on its sweet??
just a thought from a reasonably not mechanically minded person
Re: zzr250 overheating prob
Posted: Wed Aug 27, 2008 1:50 pm
by Cwidova
yeah we changed the sensor/switch in the right side of the radiator but haven changed the thermostat....prob give it a shot tonight
Re: zzr250 overheating prob
Posted: Sun Aug 31, 2008 10:32 pm
by mike-s
new rad cap?