I had an idea to place some flexihose, something similar to a hose on a vacuum cleaner, and running it from the openings on the airbox to the openings on the front of the farings (the ones next to the headlight). But I just read a thread where a guy put some ram air vents on his f4 and it started giving him problems.

https://cbrforum.com/forum/showthrea...764#post946764

Should I go through all the trouble of trying it? Or is it just gonna give me problems as well?

 

The problem with carbs is that when you do that you adjust the pressure accross the carbs. The vaccum hoses to the airboxes on most bikes is to help balance that pressure out to ensure the fuel mixture is good and well atomized.

Unfortunately taking the F2 and ramming that much more air down it doesn't work, and causes issues. Ram air wasn't sorted out until the F4i, at which point they'd gone ahead with fuel injection.

 

If you want ram air to work, you need to feed the "ram air" (slightly positive pressure) not just to the air box, but also to the FUEL BOWLS.

When you look at the amount of time it would take to sort this out VS the small HP gain that is only at high speed (70 mph +), I wouldn't bother.


Here is some testing sportrider mag did on stock systems:
http://www.sportrider.com/tech/146_9912_ram/index.html

 

How interesting. I wonder how a one way valve on the float bowls allowing air in (building of pressure) would work hooked up to the air box. This should allow everything to balance out I presume.

Then again, it's a lot of work for something fuel injection does better!