K,
When I removed my injector system, I
1. Removed the tanks
2. Removed the pump
3. Plugged the hole(s) in the engine case
4. ran a tube from one injector inlet to the other injector inlet on the carb bodies, and had a small bearing in the tube to create basically a plug for the inlet. you could just plug the inlets in anyway you want though.
Ones you go to premix, you may need to bump your mains up to compensate for the different amount of fuel. This isn't a huge increase. Some people say about 2% depending on the pre-mix ratio you run.
I always say, it's best to go high on the mains, and drop them down to find the right setting, rather then run lean, and possible seize the engine.
But look in the tuning section on NSR-WORLD.com for more info on jetting, etc...
Thanks,
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Charles Gallant