Tachometer issue

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Sep 5, 2022 | 11:52 PM

Delva

Thread Starter

1st Gear

Joined: Sep 2022

Posts: 5

Likes: 0

From: NJ

Tachometer issue

Stock at 3k rpm. Does not drop or move up. Everything else works. Any idea?

Sep 10, 2022 | 06:21 PM

Max Headflow

Seasoned HDF Member

Joined: Dec 2005

Posts: 19,939

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From: poway

No power to the tach? Model / year would be helpful.. If aftermarket, brand. Does it go to 0 on ignition on.. mechanical or electric tach.

Sep 10, 2022 | 09:21 PM

Delva

Thread Starter

1st Gear

Joined: Sep 2022

Posts: 5

Likes: 0

From: NJ

1999 sportster 1200s
yes power
just doesn’t ramp up as I hit the throttle. Stays at 3k rpm

Sep 10, 2022 | 09:48 PM

RANGER73

Club Member

Joined: Sep 2010

Posts: 15,435

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From: Beyond Fucital

Tach's no good

Sep 10, 2022 | 10:04 PM

Max Headflow

Seasoned HDF Member

Joined: Dec 2005

Posts: 19,939

Likes: 8,036

From: poway

If it seems to work normal but just stops at 3K it's pribabably the tach is bad. I've seen tach stick at 3k if the battery voltage is too high.. You'll typically get an error code on the speedo and ICM.

Sep 10, 2022 | 10:50 PM

Delva

Thread Starter

1st Gear

Joined: Sep 2022

Posts: 5

Likes: 0

From: NJ

Ok
can’t find it anywhere. They Don’t make them anymore. Been looking all over no one hv that part number. #67043-99
thanks

Sep 10, 2022 | 11:19 PM

Max Headflow

Seasoned HDF Member

Joined: Dec 2005

Posts: 19,939

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From: poway

Quote:

Originally Posted by Delva

Ok
can’t find it anywhere. They Don’t make them anymore. Been looking all over no one hv that part number. #67043-99
thanks

I think the part number is 67042-99.. There are a few on Ebay,,

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Sep 11, 2022 | 06:38 AM

bustert

Seasoned HDF Member

Joined: Aug 2008

Posts: 5,072

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the tach can be tested with the speedo tester any dealer should have.
or
you can test it yourself if you have a frequency generator. you connect to the cam sensor connector 14b.
then you take the rpm to be tested and divide by 60 to convert to frequency that needs to be input to sweep the tach to desired rpm
example: 2000rpm/60=33.3hz.
A: 2000/60=33 tolerance +/- 100
B: 4000/60=67 tolerance 120
C: 6000/60=100 tolerance 210
D: 7500/60=125 tolerance 320

Last edited by bustert; Sep 11, 2022 at 06:39 AM.