Re: !1999 Ezgo TXT engine swap
2003 is an "MCI" engine, your original 1999 was pre-MCI (although they do have the same mounts and displacement and appearance-wise are similar motors). The linkage, coils, ignition system, heads, exhaust manifold, and a few other things are not cross-compatible so You'll definitely have your tasks cut out to swap an MCI into a pre-MCI cart.
Personally, I'd give one of the site sponsors a ring and let them know what You have going on - they can let You know what You're going to need to replace (besides the obvious, which is the motor) and can steer You in the right direction as to parts, etc.
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