Good guess, but wrong. It's a spring and because it can't rotate smoothly, it spins in bursts and jerks as it winds up and unloads. They are faster than the actual speed should be and the drive in the gauge reads incorrectly. Remove the bottom of the cable too and dribble some kerosene down in till it flows out the bottom. Lube it good and see if it works better. The tach drive is not direct, it's a clutched system (otherwise it would go round and round) the tiny clutch is damped out to make it smooth. Take care of the cable first.
--- On Tue, 7/7/09, Kevin P. Miller <[email protected]> wrote: From: Kevin P. Miller <[email protected]> Subject: [Nighthawk Lovers] Re: Mechanical tach problems To: "Nighthawk Motorcycle Lovers!" <[email protected]> Date: Tuesday, July 7, 2009, 9:20 PM As long as we're talking about tach problems, mine on my '85 450 seems to read really high. As far as I can tell, it works, it just reads 2 or three times high, like 22-2300 at idle (sounds like it's idling correctly) and it "redlines" when you just goose the throttle. What might be the problem? The cable? I took it out at the tachometer end and it looks pretty corroded, but I would think that would make it read low (from drag), not high... Kevin On May 15, 2:16 pm, Redtail <[email protected]> wrote: > 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? > > Paul --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---
