its rich then, take a look at your plug, oily n black? fouled? u can test by taking off the filter all together, and run with just the black cap, or no cap. that'll lean everything up and confirm your running rich, or experiment with the number of screens, more screens equals richer, im guessing 3 screen black cap and a 64. of course get a couple new plugs as well, maybe a higher temp ones too.