Because it is a fourstroke. They suck
what would cause a 150cc scooter to lose power?
NO it would not.
It could be your connection to your battery. If its bumped loose, you would lose all power, even while driving.
i would say loose power
What would help would be an articulate question. Does "lose power" mean a loss of voltage/current, or a loss of engine power (horsepower/torque)?
its faulty
No
Head gasket
You would have to specify which Emperer you are talking about.
Try lose there power by
Check all belts, if belt broke, would cause car to lose power everything then die. Or alternator died.