took my bike out the other day got caught in traffic noticed temp gauge getting very high. So when i got home removed lower fairing tested fan ran ok tested wire from sensor put to earth ignition on fan worked ok. So rigged up small light from + wire from fan - from sensor tried it again temp gauge went to same place then bulb lit up so quick test to see if fan is working so left bulb on bike at least i have some thing to tell me fan is hopefully running

NC30's run notoriously hot for a 400, speshily in traffic.

A lot of people seem to bypass the fan to a switch so they can turn it on prematurley. But unless your having seriously bad overheating problems I wouldn't worry too much about the temperature being high, as long as the coolant is good and the system is working proprely the fan should cool it while your in traffic.

The bottom rads get a lot of crap in them due to their position so soaking them in degreaser helps to get any crud out / improve air flow when your riding :)

+1

so long as the fan comes on at the correct temp then don't worry about it.




wull

My fan comes on about 95 degrees and the temp sits about there when sitting in traffic about town but drops down a bit when on the open roads, with the wind cooling the radiator. The frame gets very hot though and a lot of heat rises up ( very nice on colder mornings ). All this is normal for an nc30 as far as im aware.
Hope this helps, happy riding.
Jamie

I remember reading that there is a night and day difference if you clean out your bottom rad. If its summer heat on mine it does like to get roastingly hot but for them to get a little warm is quite normal.

Neosophist wrote: soaking them in degreaser helps to get any crud out

AND take your time and get something like a cable tie and go through the fins indivivually to get the crud out.
do not use a power washer or a high pressure air line as it bends the fins.
i found out the hard way