Ok. So I put the new starter in and tried starting without the primary cover on so I could make sure it worked before I put it back together. The starter is engaging but it won't spin the gear. It just unscrews the bolt that holds the gear on to the starter. Any thoughts?
Completely new starter ? Did you get the spacers and everything fitting back together correctly ? Mine had a lockwasher that kept that bolt from spinning. If you dont have that, you could always use threadlocker.
If you don't have compression releases I would highly recommend either an electric setup or the S&S easy start cam which I don't have on my site yet but I can get them. This will greatly extend the life of your starter.
For a starter GOOD (I know it says Big Dog but it will work in your AIH) BEST(Same thing says Big Dog but will work in your AIH)
Personally I like the ultima starter comes with a slam button installed and the price is right! X2 on the compression release! The big inch motors kill the starters with the amount of compression.