Hello!
Hello and welcome to the Seadoo forum Jarod!
You don't give a lot of detail into your problem, so lets just start with a couple questions and see what we can find out.
Have you done a compression test on the port (left) engine? If so, what were the results?
We know your starboard (right) engine runs good, so you've stated. Let's just start the port engine, on land, hooked up to your water hose. With the gear in forward, goose the throttle (goose=bounce the throttle full and idle real fast). What is your response like. Notice the rpm's, what did you see on the rpm gage?
Pull your plugs, what do they look like. A rev limiter works by limiting power to a cylinder plug. Are the plugs oily, white or what? I'm wondering if you got a bad plug or a carb that isn't working properly.
The shaft guard on the engines are there for your protection, they won't hurt the engines if there missing.
Let me know what you come up with. Your neutral switch will keep you from going over 3000 rpms but if your starboard engine is running good, then that can't be the problem................Check the plugs and compression, get back with us, we'll go from there!.........