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Tachometer rebuild?

  • Thread starter Thread starter mpencegs
  • Start date Start date
M

mpencegs

Guest
My tachometer on my 8s 450TX has started acting more like a compression gauge.. Basically it will go up as the rpms increase but will not settle back to zero unless you let it sit for a few minutes and it will crawl back down to 0.. Is there a way to correct this or should I just get a new tach.
 
Last edited:
Are you sure the tach cable isn't broken or binding or otherwise messed up??.

Disconnect it at the back of the tach & try using a hand drill to spin it (attach a small square pc of metal in the drill chuck & insert into the tach back), make sure you spin it in the correct direction ;).

At least that would isolate the tach if it still did the compression gage thing with the drill...
 
You've got a spider making a nest in there....:D I would take it to bits and give it a clean. But before you do just try running it up on a drill (reverse drive) to check if the fault is in the tac or cable or drive.
 
Last edited:
+1 on the cable first, but after that, see if shooting some White Lithium grease into the tach housing will fix the problem. Recently mine was making a horrible squealing noise above 4k and would only stop when I let off and love tapped the tach housing. The grease fixed it and even gave a little more "snap" to my needle speed.

edit* I'd lube the cable too and see if that will save you from replacing it.
 
Thanks for the replies.. I have tried the drill and does the same behavior. I also ran the bike with the tach cable connected and the cable seems to spin just fine.. Guess I will have to cut it open and see what going on in there..
 
Just wanted to note that I cut open the tach with a drummel tool and while it looked fine I used a bit of lube and worked the tach and while not pristine it works great now.. Still sticks a bit around the low end but I am going to play with it some more and see if I can get better results.
 
Gonzo said:
+1 on the cable first, but after that, see if shooting some White Lithium grease into the tach housing will fix the problem.

I tried replacing the cable which now has the needle moving, but, it still does not seem responsive as my ears think it should be.

You just squirt it in through the cable port?

How much did you use?
Click to expand...
 
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