Reply To: Choking out


I work for a deler in southern california and i see this problem with all the brands we sell.

All new bikes have to meet the new euro4 emissions laws and motorcycle Manufacturers

have had to go to extreems to meet these laws. I own 2017 duke 390 and a 401 vitpilen and i to had this problem. The air box on these bikes are choked down and fuel maping is lean. I did some air box mods and a piggy back ecu along with a mid pipe and now it a difent bike.