Tachometer Installation - Honda Rebel Forum
Reply
 
Thread Tools Display Modes
post #1 of 12 Old 12-28-2018, 10:26 AM Thread Starter
haf
 
Join Date: May 2018
Location: ATHENS Greece
Posts: 52
Tachometer Installation

I purchased this one IMG_1650.jpg for almost 15 dollars and installed very easy..

I got power supply and negative from ignition key cable



so itís powered on from key only,

signal from yellow/black wire under the gas tank



and power for lighting from the speedometer lighting cables.













Sent from my iPad using Tapatalk

1996 Honda CMX 250
haf is offline  
Sponsored Links
Advertisement
 
post #2 of 12 Old 12-28-2018, 11:54 AM
 
Join Date: Jun 2012
Location: Boston
Posts: 66
Sounds good, do you have access to an accurate digital tachometer to help determine how accurate this unit is?

92 CB250 Nighthawk - partsbike
93 CB250 Nighthawk - partsbike
92 CB250 Nighthawk - project
78 CB400T - partsbike
81 CM400C - Project, on the road
73 CB750K3 - Long term project
Alan F. is offline  
post #3 of 12 Old 12-28-2018, 01:15 PM Thread Starter
haf
 
Join Date: May 2018
Location: ATHENS Greece
Posts: 52
Quote:
Originally Posted by Alan F. View Post
Sounds good, do you have access to an accurate digital tachometer to help determine how accurate this unit is?


No, but idle was around 1400 RPM and when I was increasing the throttle then RPM were increasing linear.

1996 Honda CMX 250
haf is offline  
 
post #4 of 12 Old 12-29-2018, 12:33 PM
 
Join Date: Jun 2012
Location: Boston
Posts: 66
That's pretty cool. For maintenance procedures like setting idle speed, the Factory Service Manual recommends connecting an accurate diagnostic tachometer, its like that for most bikes. As long as your tach works like a stock tach should I'd call it a win.

Thanks for posting your wiring, could you link us to the place you bought yours?

92 CB250 Nighthawk - partsbike
93 CB250 Nighthawk - partsbike
92 CB250 Nighthawk - project
78 CB400T - partsbike
81 CM400C - Project, on the road
73 CB750K3 - Long term project
Alan F. is offline  
post #5 of 12 Old 12-29-2018, 03:09 PM Thread Starter
haf
 
Join Date: May 2018
Location: ATHENS Greece
Posts: 52
Quote:
Originally Posted by Alan F. View Post
That's pretty cool. For maintenance procedures like setting idle speed, the Factory Service Manual recommends connecting an accurate diagnostic tachometer, its like that for most bikes. As long as your tach works like a stock tach should I'd call it a win.

Thanks for posting your wiring, could you link us to the place you bought yours?


I got mine from aliexpress but itís similar with this one

https://www.ebay.com/itm/LED-light-U....c100011.m1850




Sent from my iPhone using Tapatalk

1996 Honda CMX 250
haf is offline  
post #6 of 12 Old 12-29-2018, 08:03 PM
 
Join Date: Nov 2016
Location: Chandler, AZ
Posts: 772
I'm thinking about putting a tachometer on both my Rebel and Sportster. I don't really need them, but I like to know how fast the engine is turning. As far as idle speed, I set that by ear.
JerryH is offline  
post #7 of 12 Old 04-15-2019, 05:34 PM
 
Join Date: Mar 2019
Location: san antonio, tx
Posts: 21
just curious why you got power from 2 different places instead of just putting both power wires togethor? im about to install one just like that except its black and i put both neatives and both positives togethor so its only a 3 wire hookup now. I do have a digital non contact laser tachometer i can pull the side cover and verify its accuracy once i get it wired up in a bit.

1986 Rebel 450
4k original miles, hard tailed with 4" stretch and 3" drop, 200 rear on 18x5.5 spoke wheel, 40* rake, more to come
qwikv6 is offline  
post #8 of 12 Old 04-20-2019, 04:42 AM Thread Starter
haf
 
Join Date: May 2018
Location: ATHENS Greece
Posts: 52
Quote:
Originally Posted by qwikv6 View Post
just curious why you got power from 2 different places instead of just putting both power wires togethor? im about to install one just like that except its black and i put both neatives and both positives togethor so its only a 3 wire hookup now. I do have a digital non contact laser tachometer i can pull the side cover and verify its accuracy once i get it wired up in a bit.


One power cable was from key and the other for lights from the light switch.

Otherwise lights will be always on if both wires comes from the key

1996 Honda CMX 250
haf is offline  
post #9 of 12 Old 04-23-2019, 09:20 PM
 
Join Date: Mar 2019
Location: san antonio, tx
Posts: 21
ah i see in america motorcycles are required to have their headlights on so the speedo backlight is always on. so i wired both the power wires together and got power from one place.


also i finally got a chance to pull the stator cover and check the accuracy of the $12 amazon tach against a laser tachometer. And it reads about 500rpm high at idle, laser was reading between 1300-1400 and tach was in the 1800-1900 range, so i bumped it up to 2500rpms and the tach was about 100rpm high. then went to 3500rpms and it was pretty dead on. i didnt go any higher because i didnt feel like much would change above there and the bike is pretty loud in the garage at 3500rpm. Maybe another day when i got another set of hands ill take it to 5k, little difficult trying to hold the throttle and laser while watching the tach and trying not to get anything sucked into the spinning parts.

1986 Rebel 450
4k original miles, hard tailed with 4" stretch and 3" drop, 200 rear on 18x5.5 spoke wheel, 40* rake, more to come
qwikv6 is offline  
post #10 of 12 Old 04-24-2019, 08:18 AM
 
kryton's Avatar
 
Join Date: Sep 2016
Location: Northern Virginia
Posts: 1,913
Garage
something like this
https://www.amazon.com/dp/B07G31HZF5/
would be a lot safer than running the motor with the cover off

2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
kryton is offline  
Reply

Tags
tach wiring for 250

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Rebel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome