ok so its nothing to do with sv's but my dad brought a yamaha cygnus x 125 brand new when the 06 plate came out from CMC motorcycles in cannock, the trouble is the speedo is correct ive follow'ed him up to 65mph and its **** on but when i went a ride out with him his milage counter is reading + 50%

we did a 40 mile ride the other day and his counter had clocked up 60 miles?
first i thought kph but thats not + 50% is it? and the speedo is correct
CMC is a big company and doesnt sell imports,
any idea's
daz.