Hello everyone. I decided to put in a Mikuni 42mm carb on my Scrambler 500. It runs great when its moving. But when it is still and I give it throttle it almost seems like the throttle is sticking. The RPM's need about 15 seconds to come back down on their own. Sometimes when it's stuck on high RPM and I pop the throttle a bit it comes down quicker..... Does this sound like it could be a jetting problem. I took it apart and the cable does not stick or hold up anywhere. Any help would be great... thank you all