The Indigo prop is perfect for the engine more or less, it is specifically designed for A4s pushing displacement hulls.
The A4 uses a reduction gear in reverse, but not in forward. There are several things that can go wrong:
1. Lever not moving forward enough to get into forward detent.
2. Lever not moving back enough to fully engage reverse.
3. Internal adjustment issues.
1 and 2 can be fixed with cable adjustments usually.
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