Update January 2020
Why a Replacement Ignition?
One might assume that the OEM set the timing at
an optimum point. I think this is not the case because compromises were made in
using a single spark advance. The optimum spark advance follows a curve of
increasing advance with increasing RPM. The cars in the 1970s had a centrifugal
advance in the mechanical distributor. Today's cars use a crank sensor and
computer to select the advance. In using an single point, the RPM for the first spark
has to be delayed to a higher RPM, maybe 200 or more. This makes for hard starting.
The Replacement Ignition also has a brief time of no spark, but at 70 to 100 RPM
starts putting out sparks at near TDC to prevent kick back. On a sample of one, this
makes for immediate starting. A second spark advance kicks in automatically at
about 450 RPM.
I replaced the ignition on an old CI 10 HP Briggs and made an series of videos
some may be interested in:
Part 1, Universal Ignition Replacement Installation
YouTube Video Part 1
Part 2, Replacement Ignition Parts List
YouTube Video Part 2"
Part 3, B&S Ignition Replacement, Addendum 1, How it works.
YouTube Video Part 3
My next ignition project is to replace the ignition on a twin Briggs horizontal opposed.
Outline; This out line should help folks find
what they are looking for:
Updates: 16 February 06,11 December 2009,
- 30 March 2012, 14 May 2019
http://gardentractorpullingtips.com/index.htm , Brian Miller
http://overnight-solutions.com/, Dale Colvert
I love playing with engines, ignition systems, magnets and old generators. My site
is always under construction, but this is what I have today.
Most of the people finding their way to my website or are in search of information
on Tecumseh ignitions so in this up-date, I put that first, Topic 1. I am putting the most current information first
followed by the older and usually more detailed information. My playing with Tecumseh ignitions started before 1992 so
the most dated information will be near the end or in attachments.
Topic1, Tecumseh Ignitions
Part 1, Trigger Pin SSI, 610906,610748, 610855 and Onan NB
Testing Original Equipment
Test for Spark
Engine Kill Wire Check
Spark Plug Connector
Ignition Charge Coil
Automotive Type Replacement Ignition
Option 1 Use existing key switch
Option 2 Adding a new Toggle Switch
Option 3 Replacing the Key Switch
Trouble Shooting Guide for all Options
List of Materials
Part 2, Under the Flywheel SSI, 610759 and ESKA Single Cylinder