The stock carbs are Keihin CV's (Constant Vacumn). All Constant Vacumn carbs are very sensitive to changes in the availability of air/pressure. If you open up the inlets to the airbox by say 50%, you will find the engine dies as you open the throttle (under load not just free reving) due to a lean mixture. To remove the air filter will generally be enough to make the bike unrideable, as such removing the whole airbox, well lets say she won't be very happy.

I have been going down this road as I have modded my ZRX over the years, which is also fitted with Keihin CV carbs.Drilling 4 x 10mm holes in the airbox was enough to upset the applecart. I already had bigger Mains & Pilots fitted but I needed to open up the mixture screws 1/4 of a turn to compensate for these 4 small holes or I suffered as soon as I opened the throttle on the road. Stationary free revving, no problem as there is really no demand for fuel.

I actually triedmy current CBR the day I got it without the airfilter........., it was a pig. Put the filter back in, all good.
You can cause a similar situation running the bike with out mufflers. Sounds good, sort of, but lacks torque due to lean running. I have proven this on the Dragstrip. Removing the muffler cost me about 0.4 of a second, plus potential motor damage. But you would not know it by the number of blokes who come to the strip, pull there mufflers off & race.
Anyhow getting off topic.

 

yea i gotta stuff the airbox back in i didnt feel like messing with it tonite though but hopefully this wkend ill get it done

 

cant get at it tonite either as work sent me to buffalo ny im in the truck getting ready for bed as i type lol looks like i wont get at it till sat or sun[:@]

 

I was in Buffalo a week ago Monday!

 

put the air box in and it helped a bit but didnt cure it. still didnt fine tune the carbs so ill have to try that and im gona change the fuel filter and make sure the pump is working propper. and i think the tap may be the timing chain tensioner not the alt chain

 

Was the filter in the box too? Why was the bike taken apart originally?

 

yea filter was in i tore it appart cuz the motor gernaded. but the person who owned it last was running it with no box i got this one when i got the motor and the filter is a new k&n

 

got the carbs synced n tuned today. i think the prob that i was having was due to someone useing silicone on the bowl gaskets n some got up in the ports of the carbs cause i fired it up today and it ran like poop at first then it just started to run great like i didnt get all that gunk out when i cleaned them and there was still a piece in there some where but it came out n now it runs fine even better after i did the carb sync throttle was snappy the way i like it.

now that the cbr is almost road worthy im thinkin of another prject a cr 500 r street legal supermoto. what do you guys think?