Description
Our CDi units are hand built by skilled technicians and engineered to ensure your motorcycle performs as well as, or better than, when it was new.
Matching wire colours and connectors.
Important: There are two possible versions of this CDI. Please physically check the unit fitted to your motorcycle before ordering.
Although we make every effort to ensure our application information is accurate, variations between original market of sale do occur. Checking which version you have before ordering will help avoid unnecessary delays.
Direct plug in replacement for Yamaha:
DT175 E&F 1978 & 79 USA market models: OEM p/n: 2A7-85540-20, box often marked 2A7-20
IT125 1980-81
IT175 1979-83 (- A,B,C,D)
IT490 1983-84
OEM P/N: 2W6-85540-20-00
DT models:
This CDi unit is for bikes mainly sold in the USA market although some EU models also share it. This unit has a RED and BROWN wire – be sure to carefully check your machine has a CDi with these wires BEFORE ordering.
One year warranty from date of purchase.
Made in England
A new CDi unit is only one part of the ignition system, so if a brand new ‘plug-in’ CDi unit does not fix, or changes the symptoms then your next action is to consider other parts in the system that may need to be replaced or repaired to clear the problem, especially where that system is over 20 years old. You can be sure that the issue will be found in an old part you have not yet replaced.
Our technicians have worked with, studied and manufactured ignition systems for over a decade and now we have published a guide detailing how to troubleshoot and overhaul ageing CDi ignitions that no longer work as they should. This publication is available free of charge on our technical support page.


