Help..

Help..Please

I have a yzf 750r 93-94 model with a Factory pro kit installed, not sure which one but it has k&n foam filters on the carbs. It wont rev above 4000 revs and cant figure out why (nor can my local bike shop), can anyone let me know exactly what mods are made to the carbs please, it was done when i bought the bike and i have no info on it. I noticed on factory pro site it says bike wont rev above 4000 if exup motor or similar is not installed ,can anyone tell me exactly what this means and why it wont rev above 4000 because this is exactly the problem i have and the exup motor seems to be working fine.

can you please help its getting embarassing when vw beetles are out dragging me from the lights.

Please help i'm desperate....

Thanks

Phil

Also looking for a set of standard carbs

Dont know if it will help but found this link

http://www.r1messagenet.com/forums/showthread.php?t=89