I have a 2005 Nomad. When the bike is cold, that is the temperature is below 75F or so, the speedometer doesn't work until the bike warms up and then while I riding along the speedometer begins to show low speed that don't reflect how fast I'm actually going, but once it starts, it will show the correct speen within a few minutes. However wheter the speedometer is working or not, the odometer continues to work. Also when starting the motor, the speedometer needel doesn't go through the regular starting movement, but when warm it does. Has anyone heard of this? Any ideas what causes this and how to fix it?