Miata190

That stator will not put out enough for what you are asking

Check the front clutch rollers. They might have flat spots and its not allowing the belt to change tension. Feels like your starting in third gear. That's why it goes fast after you get going. Sometimes its from the belt wear build up

What year is it.

Really make sure you have compression.

Had 2. Good for younger person 10-13 years old