Headlight Booster

Want more JUICE out of your stock headlight, and do not want to modify your existing wiring. Click to learn more.

HID charging conversion

Are you tired of Battery depletion everytime you uses your newly installed High Intensity Discharge Headlight, Click for solutions.

Fixing OIL drain plug thread

Are you looking for fixing that oil drain plug that went bad and unable to thread that bolt due to loose thread, Here is an easy solution for, CLICK for detais.

Led Light Solution

Wanting to conserve battery power of your motorcycle? Why not change all of your indicator BULBS, such as signal light, tail light and brake light to LED BULBS. Click for more info.

HOW CDI WORKS

CDI is the heart of your ignition, wanting more power than STOCK but do not want to buy such RACING CDI? You need to know how it work first to understand where to START improving the ignition. Click for more.

Horn Interrupter

Want to have a horn sounds like a machine gun that produces successive sound with only one press of the HORN switch, add spice to that annoying stock horn, CLICK for details.

Reusable OIL filter mod

Paper element OIL filter tends to suffer from clogging, so why not try this filter mod I am using with my small motorcycle for more OIL flow.

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Last Updated: January 05, 2017

Koso Digital Speedometer for Yamaha Mio

It has been quite a long and tiring year that I have not visited this site, and been quite busy on making another information to be shared to all my readers. In lieu of 2017, hopefully everything will be an easy one for me, and so in behalf of the start of a new chapter. Happy New Year to everyone visiting mastercircuits.blogspot.com

This post is just a reminder to all who wishes to use Koso Digital Speedometer for Yamaha Mio as shown

The speedometer is a direct replacement to the original analog type speedometer when you buy a brand new Yamaha Mio sporty model. No special wiring or rewiring, a direct plug and play. Who will not love this kind of a beautiful creation made by Koso Taiwan.

But to some who do not actually know the difference between analog and digital when it comes to speedometer for motorcycles. Special attention on the condition of your  electrical is highly needed before wanting and trying to own the said speedometer. It is fragile if not taken care of properly.

Recently. I have been receiving units for repair from all over my country. The only cause that all of them broke down was battery related issues. A bit of CAUTION to those who are using it.

"DO NOT OPERATE YOUR MOTORCYCLE EQUIPPED WITH KOSO WITHOUT A HEALTHY BATTERY INSTALLED"

or

"NO LOOSE WIRING WITHIN THE ENTIRE POWER RAIL FROM BATTERY ALL THE WAY TO THE POWER CONNECTOR OF THE KOSO UNIT"

Battery acts as the entire voltage stabilizer for your electrical system. With any failure like fuse blown or loose contact connection or not properly bolted terminal. It will damage your unit.WHY?

Photo as shown came from one of the speedometer with on going repair.

The PCB traces was damage due to electrical issue and according to the owner of unit, It was loose battery connection and unsecured bolt on the terminal that causes voltage spike within the entire system.




As of the writing, the traces was gone both top and bottom side of the PCB. It is the trace that handles the power rail of the unit before reaching the step down converter circuit. It is probable that the drop converter which uses the Switchmode type was also damage.