How high do you guys usually allow your motors to rev when trying to
pull up in 3rd and get going fast enough to continue on into 4th gear?

 From listening to the motor, I try to always keep it under 3k if I can,
but when fully loaded and on a trip (going uphills/etc) I find myself
often pushing the 4k mark.

At what point are you going too high and doing damage?

Thanks,
chris

(I did try searching archives, but there is just so much talk about
redline oil I couldnt find any decent previous topics)