March 27th, 2019, 11:29 PM | #1 |
ninjette.org member
Name: Anthony
Location: Pittsburgh
Join Date: Mar 2019 Motorcycle(s): 2008 Ninja 250, 2015 zx10r, 2010 Ducati 848 Posts: 75
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Tach randomly stopped working
So I fired up my wife's bike. The tach jumped around a bit then dropped to 0. I haven't started it in a few days but it does have a new battery. I figured it was just low voltage, but it didn't come back after a few minutes, so I hooked it up to a tender for a while. Retired it and still nothing. I did a search on here and apparently a boogered up tach isn't all that uncommon. Unfortunately I do admit I have trouble reading a wiring diagram. Can someone show me where the tach gets it's feed from the engine and where it's ground is? I'd like to rule out electrical before I start looking for a new tach...
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March 28th, 2019, 11:31 PM | #2 |
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Name: AKA JacRyann
Location: Mesa, AZ
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Two possible causes of non-operational tach.
1. Stiction in needle-shaft. It spins in brass-bushing and can get bound up. Drip some light oil onto bushing and rotate needle a little to work it in 2. Broken wire between tach and left coil (where tach gets signal). Use oscilloscope at coil and then at tach to verify that exact same signal arrives at tach. Should look something like this, logic high with periodic grounds to fire coil. |
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March 29th, 2019, 02:25 AM | #3 |
ninjette.org member
Name: Anthony
Location: Pittsburgh
Join Date: Mar 2019 Motorcycle(s): 2008 Ninja 250, 2015 zx10r, 2010 Ducati 848 Posts: 75
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Thanks for the reply! As that looks like my old TI-81 calculator in 7th grade, and I hated math, I'll check the wire going to the coil first haha
It sounds as if the gauge cluster is easy to manipulate apart? |
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March 29th, 2019, 11:34 AM | #4 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Yeah, just remove upper fairing and all dash wires can be accessed from underneath cluster.
Note, unless you're Superman and can see electrons flowing, how will you know if wire is good or not? A lot of problems come from wires broken underneath insulation. Last futzed with by DannoXYZ; March 29th, 2019 at 12:50 PM. |
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March 29th, 2019, 03:03 PM | #5 |
ninjette.org sage
Name: Kevin
Location: Portland, OR
Join Date: Oct 2013 Motorcycle(s): Ninja 250R, Tiger 800 XRT Posts: 828
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You could test the wire continuity with a multimeter, way cheaper than a scope. Won't help you beyond that though, if the wire isn't broken and it still doesn't work then you'll need a scope to see the signal.
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March 29th, 2019, 04:29 PM | #6 |
EX500 full of EX250 parts
Name: Bill
Location: Grand Rapids-ish, MI
Join Date: Jul 2012 Motorcycle(s): '18 Ninja 400 • '09 Ninja 500R (selling) • '98 VFR800 (project) • '85 Vulcan VN700 (sold) Posts: A lot.
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The gauge itself uses the same brown accessory wire and common black/yellow wire as the rest of the dash for power and ground respectively. As DannoXYZ said, the tach signal is just a fork of the black wire running from the igniter to the coil. Assuming your black wire is good, and the coil is working properly (which means the igniter and main black wire are working properly), that pretty much narrows it down to the gauge - either something wrong with the gauge itself or a bad connection to it.
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