endbell covers for hand wound neus

[DwightSchrute]

i'm running an 1/8 onroad conversion and am about to drop a 1515 1Y in it. i've got it geared fairly high, and i usually cover the endbells but for this one, i was thinking maybe i should just leave it open for added cooling.

is this a bad idea? is it ok to run them open? am i posing any risks to the motor?

any advise is appreciated.