Setting Up and Timing a Lucas K2F Magneto
Download the complete PDF version using the green download button at the top right of this page for a detailed technical guide covering the setup and ignition timing of a Lucas K2F magneto. This article explains how to check and equalise contact breaker point gaps, inspect and correct cam ring alignment, establish true top dead centre and accurately time the magneto using a degree wheel and volt-ohm meter.
The guide begins with the importance of matching point gaps on both cam ramps, noting that unequal gaps can produce a measurable timing difference between cylinders. It then explains how to inspect the cam ring, correct minor centring errors and identify excessive ramp wear before proceeding with timing work.
Later sections cover setting the automatic advance unit in the fully advanced position, locating the compression stroke, zeroing the timing disc at top dead centre and adjusting the magneto until the points open at the desired ignition timing figure. The article also includes useful practical notes on drive chain slack, high-tension lead routing, plug cap resistance and the commonly debated 0.012-inch versus 0.015-inch point gap specification.
Contents Include
- Lucas K2F magneto setup and timing procedure
- Checking and matching contact breaker point gaps
- Cam ring inspection and centring corrections
- Identifying worn cam ring ramp profiles
- Using a volt-ohm meter to detect points opening
- Finding true top dead centre with a degree wheel
- Locking the automatic advance unit in full advance
- Adjusting ignition timing accurately
- Checking timing difference between both cylinders
- Magneto drive chain slack guidance
- High-tension pickup and lead fitting notes
- Point gap specification discussion
