The speedo dial on my ZX has an annoying twitch, which makes telling the speed below about 50mph a very hit and miss affair. Upto 50mph the needle constantly wobbles buy around 10% of the current speed. So at
40mph it wavers between 40 and 44mph, and at around 50mph it finally stabilises and reads a constant speed (albeit about 10% faster than the speed reported by my GPS unit).Also at higher speeds the rev counter periodically does a full wave from redline, to zero and back to the correct reading.
From memory it's done this for around 30,000 miles, and I'm just curious rather than concerned...
Regards, Jason.