Bill, the stock motor (Goldfire) is just a plain 550/600 class motor, nothing special about it. It has plain bronze bushings and small brushes. You can putt around just fine with this motor.

Batteries have come a long way in the 5 years since you've had your e-streak. You can have longer duration AND greater performance.

A cheap upgrade motor would be a Kyosho Atomic Force 17T. This is a fully timing adjustable motor with very large brushes and ball bearings for about $20. It lighter than the stock motor and will bolt right in. Runs great on 6 or 7 cell packs. You will need a higher current ESC than the one that comes with the e-streak ARF kit though.

I used to fly mine with a CEM FAI15 motor on 8 2400 cells. Fast and good long duration (8 minutes typical). If you want to go slower and stretch the duration that's what the throttle is for .

For the best of all worlds, a quality brushless motor will extend flight time and give higher performance at the same time.