I have a 15 road king with a 103 that was made into a fuel moto 110 this past winter. It runs good but on occasion it sounds like a week lifter on fron cyl. The noise is intermittent last 5-10 seconds then it goes away. It is usually between 2-3 thousand rpms, Harley shop says its normal with bigger cams, Im running woods 999. Should I put in new lifters or any suggestions, Harley said run it but Im looking for second opinions here.