Check the oil on the dipstick (on the right side of the engine, on the clutch cover) if the color is dark (like coffee color) it obviously has not been changed for a while. If the oil is fresh and within a couple hundred miles after changed, it should have the color like honey. There are lot of debates go on the forum that what kind of oil is better for CBR. As my opinion, you have a bike with the technology in a couple decades ago. I believe today's cheaper oil is still much better than 20 years ago. However, always better is better. BTW, my babe is 1987 model. with 16k miles on her. She is goooooooood.

 

TRY WATER WETTER TILL YOU FIGURE OUT THE PROBLEM. YOU CAN GET THE PINK LIQUID FROM AN AUTO PARTS STORE

 

If I'm at a set of lights and the fan comes on, I can hear it (with helmet on), and so can people in cars close to me.
Can be hard to hear if loud traffic around you.

I don’t think a PC fan would do much, if you sit at lights in neutral, then connect it to the neutral circuit.
That way it will come on when you are stopped, mostly

 

Actually, if you run a wire from the fan sensor (down the bottom LH front from memory) through a switch that goes to any conveneient ground, the fan will still come on automatically as before, but when you throw the switch the fan will come on and stay on until you open the switch (providing the the engine isn't too hot when you do) again.
You must leave the original wire in place and add the extra wire that goes to the switch. A single pole single terminal switch is what you need.

Here in Oz, I've found it a big help in preventing the buildup of heat while going slowly or idling. There is little doubt though when the fan comes on since it's clearly adible even with helmet on and in traffic.

I don't think the PC fan will do anyting at all except get gummed up.

Cheers

 

Yes, my '87 Hurricane had one and I plan on putting one on my '88. Makes a difference in traffic for sure. Changing the antifreeze could help also, it will wear out over time.

 

Good evening all

My CBR1000F 88 , was doing the same thing, did not take the chance after 19 years better change those componant they are not that expensive and can save you from a lot of trouble, Iflushed the coolant, changed the thermoswitch and the thermostat, now the fan is kicking when it get to past the halfway mark..Also I did put a manual switch just in case I get caught in trafic and don't want to wait for the fan to start automatically .

Carl aka Dragon64

 

my 87 CBR1000F dose the same as everyone has mentioned heats up at lights and slow speeds
in traffic ive only had the bike for 6weeks was going to flush sys and change coolent and put the addative
mentioned eairler in the post inbut im gonna wait until time to put it away for winter

 

I MIX MINE HALF COOLENT AND HALF DISTILED WATER AND A BOTTEL OF WATER WETTER AND MINE RUNS GREAT