What should I go with???

[brijar]

How does runtime compare between an L series and an XL series? I am running a 9L at 16/72 and have about a 20 minute run time for the first run of the day on my only set of 13 GP3300's, as well as good speed, but I haven't measured it yet. The motor does often get too hot to touch. Usually about 60 degrees Celcius, or about 140 degrees F. I would like at least the same speed that I have now, or about 40MPH and the same runtime. Which XL should I get and what gearing should I run with it? I may not get one due to being low on cash, but I can still plan:027:.
Also, how hot is too hot for a 9L motor? I really don't want to ruin it.

Thanx,
Brijar!!!