Dwell/Tachometer Question

Information and questions on GL1100 Goldwings (1980-1983)
  • Sponsored Links
Post Reply
Posts: 144
Joined: Sun Aug 05, 2012 8:46 pm
Location: Milwaukee, Wisconsin
Motorcycle: 1980GL1100 NICE!

Dwell/Tachometer Question

Post by tunaboy » Fri Mar 29, 2013 1:16 pm

I found my dad's old dwell-tac. My question it's been over 40 years since I used this thing. I am thinking about using the tac for setting my pilot jets with it. It has a red and black lead with alligator clip on each. Where do I hook up the leads to get a signal to the unit?

User avatar
Posts: 2112
Joined: Tue Oct 20, 2009 11:21 am
Location: Plano, TX
Motorcycle: 2017 Yamaha FZ07, 2015 Yamaha Super Tenere ES, 2005 Honda Shadow 750, CRF450X, CRF230, CRF250X, XR200, CR500, Gas Gas TXT200

Re: Dwell/Tachometer Question

Post by thrasherg » Fri Mar 29, 2013 1:43 pm

On my old unit, the black lead was connected to ground (Usually clipped on the engine somewhere) and the red lead went to the points (The coil side of the points).. If you have an electronic ignition, I am not sure you can use the unit (There is no dwell angle to measure on a solid state pickup!!).


User avatar
Johnyy Smoke
Posts: 695
Joined: Sat Nov 26, 2011 6:44 am
Location: Se Minnesota
Motorcycle: 1980 GL1100
Vetter. "Its like Deja Vu all over again".

Re: Dwell/Tachometer Question

Post by Johnyy Smoke » Fri Mar 29, 2013 6:40 pm

Dosent the red lead hook up to #1 spark plug? Regards, Johnyy

User avatar
Posts: 8289
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Dwell/Tachometer Question

Post by virgilmobile » Fri Mar 29, 2013 9:33 pm

No that's for a timing light.The old tach measures pulses from The points.You could tap it to the ignition coil input from the module.And yes,the dwell angle measurement is mute on the electronic ignition.
Note however,the old meters were designed to read pulses for a 6 or 8 cylinder engine so expect very low rpm. readings.

Post Reply