High RPM bogging issue 2003 Rx-1

[H3L10W]

I have a 2003 RX1 that cuts out/ bogs above 4k rpm. If I put the choke on it get a bit more power but still maxes out at 5k ish. It also idles low and rough without the choke. I have cleaned the carbs two times the jets are clear. I am not running an airbox right now, the sled came without it. Will not running an airbox cause this bogging? there are 4 vacuum hoses that come off the top of the carbs that aren't hooked up to anything.

 

[74Nitro]

You need the airbox for it to run right.

 

[H3L10W]

Why is that the case? sorry if that's a really noob question. Ive test run jet skis and other sleds without the airbox and its never affected how they run.

 

[74Nitro]

Has to do with the CV carbs.
Almost any machine, atv, motorcycle etc, with a CV carb will not run properly without the airbox.

 

[maim]

if you want to run with kn pod filters , you need to use the yellow aftermarket cv springs for it to behave properly. did it for sappling killers 04 rx1 mod sled.