You know, if you set your kart up right then you realy wont tear it up to bad. Of course you and your fellow drivers will have to keep their noses clean and keep the kart on the track, but if you can do that, what else are you going to tear up?? Keep in mind that we are talking about 3hours worth of track time!!
A) How many sprint races would it take to acheive 3 hours of track time??
B) Consistency will win you the race, not fastest lap.
C) IMI realy isnt that tough on equipment imho.
When I raced my SCCA car in an enduro, it was the easiest race on our equipment and the most fun we had all year. Despite being short 1 driver and running out of fuel after the first stint, we still managed to be consistent enough to finish 2nd in class.
For what it is worth, this is what I plan to do to my kart to make sure it goes the distance:
Gear down! Drop 500 to 800 off your regular top RPM and save the motor.
Mix the fuel just a little heavier on the oil and richen the carb a TOUCH to help lube and cool the motor.
If allowed, run a harder compound tire. Drop a few tenths per lap but save tons of time in the pits.
Soak a new chain (Panther Chain??) the night before the race and lube the chain at every pit stop.
New gears front and rear.
Just my thoughts.
Lets get this enduro started!!