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General Category => General Discussion => Topic started by: Kal k on March 05, 2017, 10:06:39 AM

Title: bouncing tach
Post by: Kal k on March 05, 2017, 10:06:39 AM

I have a 79 invader and it has a bad bouncing tach and tryed a tach off a 340 invader on it and it dos the same thing. Any ideas?

Title: Re: bouncing tach
Post by: sxrsist on March 05, 2017, 10:27:22 AM

i have tried a few tachs. never get smooth reading either.

Title: Re: bouncing tach
Post by: gixxer6 on March 05, 2017, 10:40:22 AM

I had an Invader with a bouncy tach, I replaced it with a NOS tach and the problem went away.  It seems like when they get worn they bounce. 

Title: Re: bouncing tach
Post by: rminier on March 05, 2017, 01:13:52 PM

http://kawasakitrax.com/kawiforum/index.php?topic=1657.msg10735#msg10735

I haven't tried what "sprocket" suggested on this, but I intend to. I bet it works.
I wonder if there is a cheap resistor inside the tachs that wears out after 40 years?

Title: Re: bouncing tach
Post by: Kal k on March 06, 2017, 06:47:22 AM

Ok thanks for the help

Title: Re: bouncing tach
Post by: sxrsist on March 12, 2017, 10:16:02 AM

i had a tach the never bounced on my invesder and swapped with ltd and still bounced on ltd and ltd one never bounced on invader. its in sled i think

Title: Re: bouncing tach
Post by: jimvw57 on March 12, 2017, 03:18:16 PM

The tachometer is simply a voltage meter that reads the voltage from the engine. as it runs faster, it makes more voltage. Since the voltage made is AC, there is a regulator that converts it to DC and they use that for making spark and lights. I wouldn't worry about a bouncing tach too much as it isn't even that accurate anyhow.

Title: Re: bouncing tach
Post by: gixxer6 on March 13, 2017, 06:58:34 AM

Quote from: jimvw57 on March 12, 2017, 03:18:16 PM

The tachometer is simply a voltage meter that reads the voltage from the engine. as it runs faster, it makes more voltage. Since the voltage made is AC, there is a regulator that converts it to DC and they use that for making spark and lights. I wouldn't worry about a bouncing tach too much as it isn't even that accurate anyhow.

These tachs are pulse counters, not volt meters.  The faster the motor spins, the higher the frequency of the pulses.  They should be quite accurate. 

Title: Re: bouncing tach
Post by: Kal k on March 14, 2017, 10:26:13 PM

I ended up putting a after market tack on my invader and it fixed the problem. Thanks for the help

Title: Re: bouncing tach
Post by: Interceptor398 on March 15, 2017, 07:39:23 AM

There should be plenty of used tach's out there?