generally, you will have less issues of engine cooling on the highway because you are cruising at a steady speed and the engine gets enough air passing around it to keep it happy. its the city start-stop traffic which can be potentially bothersome.
under any circumstance, the rx has a large fin area compared to the engine size, so overheating is never an issue unless something is botched up.
you are touching 100 and getting 35kpl, be happy with it.
performance can be improved... and not necessarily at the expense of fuel consumption and engine life. but its a not-so-vicious circle. once you start down the path, you always want more power.
disk brake in the front is the best thing you can do to the bike.
then you can go for a better filter + jets.
then you can go for a better cdi
then you can go for some mild porting
then you can go for basic chambers
then you can go for higher compression heads
then you can go for a better carb
then you can go for rearsets
then you can go for clipons
then you can go for a 5 speed conversion
then you can go for a 135 5 speed barrel and crank
then you can go for a really high rpm setup on those barrels
then you can go for a better chamber to go with that
then you can go for better sprocketing
then you can go for weight reduction
then you can go for a big bore
then you can go for chambers to go with that
then you can go for better suspension and running gear
then you can go for a fairing
then i can say "see what i mean?"
LOL...
i may have certainly omited many things here.
the point is that you have to decide where to stop.
personally, i would go the whole way and end up with a fantastic track bike.
cheers
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Abhishek
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