Why ent there enough power going to my brand new starter motor seems to spin slow when i connect strait from battery

The clicking will be the starter solenoid not getting enough juice. Check the battery charge, especially the connections, which may need to be cleaned. Use Sodium Bicarbonate (baking soda) in a little water to clean the connections, which will sizzle a bit. Wipe dry and clean.

Take the starter off and go through it again, with a no crank condition its pretty simple in that there is only a few components that are going to prevent cranking over, starter and starter solenoid, battery, and ignition switch. If its clicking thats most likely the starter solenoid clicking but the starter motor isn't spinning. Bench testing a starter only tells you that it will spin without any load on it, but on the engine it might not have enough power to spin. Check all cables, clean all connections, check voltage at the starter terminals and compare to the battery voltage, if there is a big difference you have a bad connection somewhere causing voltage drop.

If all else fails get a new starter since its a new battery and go from there. Having it out on the bench without a load might have got it unstuck and working again, still sounds like a failing starter. Try giving the starter a few taps with a hammer on the side and try starting again to see if its stuck.

The small wire to the starter is loose or failing to make a good connection it gets enough power ti click the solenoid but not engage the starter

check the battery ground wire.. should be bolted to the engine, battery connections also..

Do head lights stay on (bright) while trying to crank starter? If not, starter motor isn't getting enough current, OR engine is locked. Is there current getting through the solenoid to starter motor? Check the ground connection between the engine and chassis as well as battery and chassis.

The FC3S is notorious for this and fueling issues. Check all ground points, battery cables and connections. Check the draw from the starter. If the voltage drops below 10V there is not enough power for the ignition, causing weak spark. It really needs to spin over 200rpm cranking. Pop starting does not necessarily mean the compression is good. You need to make sure it cranks fast enough to get a proper compression test with rotary tester, New NGK plugs, new NGK plug wires.

Sometimes the starter motor bushes can be worn out and so will work with a high level of friction which will not power the engine to turn over. Also if the brushes or the commutator in the motor is bad it will be hard to turn.
The starter solenoid also is a suspect as if this is worn out it will be delivering lower current to the motor which will not be sufficient to turn the engine .
So please remove the starter motor and overhaul.. check the starter pinion and flywheel.

Check your battery if it is ok, check all ground connections. If they are corroded, you will not get enough current to spin starter. Check motor to body ground strap, battery to motor connection and battery to body connection. Remove the bolt that is holding the connections on because it can look allright and still be corroded underneath.

Check all other battery connections, battery to motor and body. Also Motor to Body ground strap. Make sure all connections are not corroded. If that does not help check starter soloinoid and starter

check the starter motor.