Boyer timing setup on a 99

Follow the Boyer Bransden instructions.

Contact me by personal message and I can organise a copy.

Go to:
http://www.boyerbransden.com/instructions.html

Mark Woodward.

You can't 'adjust' the advance. (that is built in to the ignition) Remove the primary cover. locate the engine to Top Dead Centre. (this can be3/5 deg wide so be careful and accurate) use a TDC tool or bore out an old spark plug.
Mark the alternator to a line with the mark in line with the rotor line-TDC (if you have a modern encapsulated alternator this is easy) then turn then engine back to bring it up to your fully advanced point, again mark the stator as ign point. Start engine, with strobe (and a guess with revs) rev the engine until you see the ignition flash move to the fully advanced point.
As this engine did not start life with 12V or a Boyer Bransden ignition what you have to move I do not know.

"Submitted by Ian Burdon on Mon, 30/09/2024

BB ignition 

Is BB serious? I've never seen such a long list of instruction sheets for what should be a fairly straightforward  electrical system! All I want to know is how to adjust the advance using a strobe and a timing disc!"

Some people would thank him.

... too many instructions than not enough. I find the Boyer instructions excellent.

Ian,  Was your original ignition system a Lucas 18D2 single 6V coil  and is your Boyer hooked up to that device ?  Or has the previous owner removed the 18D2 set and fitted a replacement housing to mount the pickup coils and rotating sender and fitted twin coils ?  I am not sure what you've got fitted and that will alter how you use the strobe.  Cheers, howard

So I am guessing here a little but you have still got the drive sprocket for the 18D2 unit with the tapered pin that then drives the shaft within the device.  The reluctor unit with the two magnets fits into that  driven shaft and the pick-up coils are mounted either side of a plate such that the reluctor spins freely with a miniscule gap between the magnets and the pick-up.  Hopefully the original shaft with the springs to control the advance of the cam for the points has been removed. So as Al has said the advance is now automatically done within the Boyer amplifier depending purely on the engine's rpm.  So if you haven't got a Commando type alternator rotor you will need to mark it, by using a schoolroom protractor, so that it indicates 32 deg BTDC against a piece of stiff wire attached to a cylinder base nut.  Also put another mark at TDC. Time the engine approximately as per the BB instruction sheet such that the magnet is in the required position with respect to one of the pick-ups with the TDC mark on the rotor aligned with the pointer. (Remember the magnets are rotating in the opposite direction to the engine.)  Fire up the engine and adjust the pick-up coils position by rotating the mounting plate clockwise or counter-clockwise whist the strobe shows the dynamic position of firing. Aim for the 32 deg mark. Good luck, Howard