Yup , this can be made better and has been done by Pete (Shadow) and I think from memory Beard did it..??

Insulating the engine from the under tank and forward seat area..
A thread on this was generated about 4-5 mths ago from memory

I will have a bit of a search ...

EDIT- dont yu hate it when posts hit the boards at the same time with the same info .. lol
thanks Hawk :-)

 

I owned two 1980 KZ1300s (A2 & B2 models) that are in-line 6 cylinder heat monsters, so these bikes are not hot to me. Out here in Nevada, it rarely gets hotter than 90 F so heat is not that much of a problem (high desert is not like Las Vegas). The rest of the time heat is a welcomed event (cold winters).
BlueBeard, does that blank make the bike run hotter, which would cause some problems with things like coils, carb vapor lock, etc???
So, here is my offered up solution. Buy a 1980 KZ1300 B2 and sit on it while its running in traffic on a 105 F day in Sacramento, CA..... Go back home and enjoy the coolness of your 1988 CBR1000F. Have a favorite drink and try this manuver.
P.S. You could have a manual fan switch that would give you control of the fan motor. There might be a low temperature T-stat that would allow flow at a lower temp thus keeping the motor cooler earlier. Also, there might be a temperture sensor that automatically turns on the fan earlier. Alls those temperture sensor are, are thermostatically controlled switches. The "hot" lead just gets grounded once the temperature exceeds its engineered temperature point. I believe these have a "fan switch" and a temperature "light" switch. If you are interested in fitting a manual fan, it may have been done on this forum before OR if not, I can walk you through the electric.