Doing some work on my 86 VR. Have cleaned carbs and checked jets and all seem clean. Put carbs back in and runs but doesn't seems to take gas. Compression seems fine on all cylinders but number 2 does not seem to get hot like others. Looking down at throttle bodies at idle number 2 is quivering and moving while others are still. Is this normally or another problem like maybe diaphram. Bike runs better with air filter on. Anyone have any ideas?