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I'm inclined to agree with JReagan, the snorkel forces the air to turn 90 degrees and the intake points toward the ground at a 45 degree angle. It limits the amount of air that can get to the carbs and it certainly reduces intake sound.
I didn't have to rejet when I pulled out the snorkel, and actually the engine ran really well; better throttle response across the whole range. When I pulled the restrictor plate out also, I had problems; it ran too lean. At that point I decided it was best to replace the snorkel until I after I had rejetted. It was easier to stuff the snorkel back in than to reinstall the restrictor plate; each limits the airflow about the same, so with either installed the engine will run fine.
Once I installed TORs I rejetted with 115 mains. I left the stock pilot and idle jets, but turned the pilot screws out to 3 turns. the engine runs really well this way, throttle response is much better than stock.
I think it's really important to emphasize I synchronized the carbs also. All of that hardware was also carefully engineered to ensure the intake airflow remained fairly balanced between the carbs. You have to synchronize them to ensure that balance is maintained, or you'll have one cylinder running hotter than the other.
I'm going to ride it this way for a week or so and see if I think there is anything I should do to fine tune it, then I'm bringing it in and have it dyno tuned. I'll post the dynos too.
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