promac850
formerly promac610
Surely you can save a few seconds now and then with an inboard, but the price is rather high - adverse effect on the handling of the saw, more wear and tear on the crank and PTO side crank bearing, and "trapping" heat in general, and particularly on the clutch bearing - which have proven to be a major problem on some saws with plastic caged clutch bearings (mainly MS261 and 362, that I know of).
I will give you that. I haven't had a problem with that yet, though. Granted, I don't run my saw more than a tank full at a time. I take breaks and check the saw over, if the chain's loose, I let it cool and readjust, etc. I don't go about like a chicken with its head cut off and refuelling like crazy and running around with the saw because that is how you get hurt.