Yes it is heavy
It also has a high center of gravity, It will take a bit of practice to learn how to handle this.
There is a known hard starting issue when the engine is hot. There are 3 possible fixes, many do all 3,
1. new battery, you already did that.
2. new starter wires, upgrade to #4AWG welding wire.
3. replace starter with newer 4 brush starter.
To test the charging system
http://www.venturerider.org/forum/showthread.php?81297-Testing-for-a-Battery-not-Charging