75 Puch Runs but I need Help

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Well Success is almost mine!

I got my newly aquired Moped to fire and run for the first time tonight - YAY - first time it has run since?

Anyway - Here's the deal - I can't keep it running just right -

Problem:

Going down hill, it will move right along and keep the revs up. Going uphill or under load, it lacks power.

Could it be:

1) Idle screw not set right?

2) SparkPlug Gap?

3) Weak coil?

4) Poor compression?

5) Did I overlook something or miss it completely?

If I pick it up, it will rev right up, but then begins to bog out. I have to keep reving it up and down to maintain power.

Any and all thoughts greatly appreciated. I am new at this, so please be gentle!

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