AJS & Matchless Owners Club

East Suffolk Section

Technical Tip (9): Twin magneto extractor bolt

Handy Technical Tip

To adjust the ignition timing for your magneto twin, an extractor is needed to free the timing gear from its taper. Since the thread in the bore of the gear is identical to that of the end-cap on the crankcase oil filter tunnel, adapt an old one of these easily by drilling and tapping it to take an extractor bolt.

In an emergency out on the road, of course, you could try using the shiny cap off the machine, as long as you have a rag ready to catch the dribble of oil from the tunnel.  In the absence of an extractor bolt, after tightening the cap down, a smart angled rap on it should free the gear.