Tach Help - Honda Rebel Forum
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post #1 of 9 Old 09-16-2019, 04:07 PM Thread Starter
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Tach Help

After 11+ years of going just by ear, and with diminished hearing, I decided to get this tach just to set the idle speed. Don't plan to mount it permanently. https://www.ebay.com/itm/2-in-1-Digi...72.m2749.l2649

Instructions say Black wire : Ground wire, connect battery negtive output (DC - ) Red wire: Power supply, connect battery positive output (DC +) Yellow wire : Speed signal cable, connet to ignitor outlet or trigger lines

My limited knowledge of electronics is sufficient to know where the red and black wires go, but where would you electrical gurus suggest connecting the yellow wire? I've read threads on other tachs where they just wrapped a wire around the spark plug wires. Would this work?

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post #2 of 9 Old 09-16-2019, 04:59 PM
 
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I take the instructions to mean tapping into the Bu/Y wire.
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post #3 of 9 Old 09-16-2019, 08:16 PM
 
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I'll agree with Guba
from the ad # 6. Installation guide :
"6.2.2 The high voltage ignition coil inlet wire (if car have no special speed line, we advise connected here)"

Inductive plug wire wrapped type is simpler method but they tend to cost a bit more..

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post #4 of 9 Old 09-16-2019, 11:09 PM Thread Starter
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Where would I find this wire? Is it in the front junction box? Under the seat? I hate electronics and really suck at it.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
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post #5 of 9 Old 09-17-2019, 11:15 AM
 
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I would think the easiest access to would be at the spark plug coil electrical connector..

Should be able to unplug one of the coils from harness and slip stripped wire into connector and reconnect wire harness as a temporary setup.. for a permanent connection I would strip back some insulation without cutting through wire from Blue/Yellow circuit and solder connection than seal with liquid tape..

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #6 of 9 Old 09-17-2019, 01:24 PM Thread Starter
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Thanks!

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #7 of 9 Old 09-17-2019, 05:05 PM
 
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Please let us know how it works out, preferably with pics, so that we can follow in your footsteps, Flite. I'd like to have a tach on my Rebel.

'05 Rebel 250 (my first motorcycle, maybe my last?)

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post #8 of 9 Old 09-17-2019, 10:47 PM Thread Starter
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I don't plan on mounting mine, just use it temporarily to set the idle. Here are several threads about mounting a tach. https://www.hondarebelforum.com/tags/tachometer.html

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #9 of 9 Old 09-24-2019, 10:48 AM
 
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Hi, I got a Searon digital tach on Amazon for $22. There are two models - one with a grounding wire and one without. I got the one without. It works great. I recently rejetted my carb and so my idle was high. I wrapped the black lead around my plug wire and it metered 1800 RPM. Two quarter turns on my idle screw (counterclockwise) got me to 1450. It took all of 2 minutes.


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