kotsaka

hi guys! i have wilver fjs 400 d8 from a few days . great maxi scooter better than suzuki yamaha e.t.c. BUT i have a problem with rpm and spedometer . in any time they working properly, another time they not work.... first i check the fuses-all is ok after that i chesk the couplers behind the rpm and spedometer - all looks ok . thats all. i dont have any idea for the bad reason. pls if you can recomend me for something .... many thanks in advance