Ninja KX-750R 1990, does not rev properly
 

I have owned my 1990 Ninja KX-750R since it was new. This has been a fantastic bike, but I am finally running into some mechanical problems that I need some help with. It will start fine when using the choke, however, it will not idle without the choke and it dies if I rev with throttle. The engine will rev up if I apply more choke, but dies when I give it gas from the throttle.

Thanks for the help!

David

clean the carburetors. Also check the airbox to see no obstraction as well as air filter