I picked up an '85 450 last year about this time. The tach has been acting up since I got it. It is okay to about 3000 RPM, but then starts to jump around. I have proved that it is definitely the tach and not the cable or gear in the crankcase. I did this by interchanging it with the speedo. The speedo ran smooth while using it as a tach while the tach still jumped around when being used as a speedo. I managed to take it apart by seperating it at the seam where there is a thin steel band. It still looks like brand new inside. I even took it apart very carefully and cleaned the bearing it pivots on and lubed it with one minute drop of transmission fluid. It now seems to be better, but still jumps around a little. I can fix most things, but am not having any luck with this. Am I missing something or am I just going to have to look for a replacement?
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