110cc pocket bike

By admin, on March 16th, 2010

I have a 110cc fighter super pocket bike and the speedometers off, how do i fix that?

I have a 110cc fighter super pocket bike and i know I’m riding about 45mph but the speedometer says I’m going 80 how do i fix it.

First of all, I guess if you want to go the really easy route, ride alongside someone traveling a known speed (i.e. a speedo more accurate than yours). If you’re doing 45 when the speedo shows 80, use some of the little vinyl stick on numbers to paste a 45 over the 80. You could do this on the outside glass or take it apart and paste them to the face of the speedo. Do this at several speeds, say 20, 30,40, etc.

I’m sure it’s a mechanical speedometer, so if you want to take the hard route, remove the outer shell. It may come apart easily or you may have to gently unroll the metal lip of the front outside ring. It’s bent over the backside of the instrument shell. You can pry it up a little bit at a time going around and around. Bent it too far the first time and you’ll stretch the metal.

Once apart, you’ll see the needle is attached to a small metal thing that looks like a soup bowl. A coiled watch spring is attached to this thing. You will need to increase the tension of the spring. On most, the end of the spring is pegged into a small hole with a little tapered pin. You’ll need to remove the peg, slip a little more of the spring into the hole and reinsert the peg. You’ll then need to test it to see how close your calibration is.

A easy way to calibrate it is to first know the amount of error. Before working on it, check the end of the speedo cable into an electric drill, run the drill and notice the indicated speed. In your case, yours is an astounding 35 mph fast, so you’ll need to keep adjusting the spring and running the drill until your indicated speed is 35 less than the drill indicated speed.

Personally, I’d find little sticky numbers and either paste them to the lens or the instrument face. A lot of shops that make signs have lasers that will cut anything you want out of a piece of adhesive backed vinyl.