I had the exact same problem with mine, and the reason was that the ground wire was broken. I don't know what it is or how to repair, my dad repaired it, but that's what the problem is and it is not hard to fix, and if this is not the reason then you only need to replace the battery.
bike is not shifting
The shifting sensor on a Honda Rancher 420 is located on the lower, back side of the motor, to the left of the reverse switch. You must remove the skid plate to access it.
Read this: http://forums.atvconnection.com/messageview.cfm/catid/8/threadid/531675
No, a Honda Rancher 350 carburetor will not work on a Honda Rancher 400. The difference in the sizes of the 350 and 400 carburetors are not compatible with each other.
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no