Timing an electronic ignition

[chrisx1]

I've lost my info on how to time my electronic ignition.

[DAVE BRADY]

Hi,

What type is it?

Dave.

[Gup holland]

Maybe this could help , or someone else.

Boyer mk 3 ignition

[Allan G]

Just seen you have a 1963 A65.

Since your bike doesn't have a crank locating slot (if it's still the 1963 motor) nor will it have a primary with a removable window for strobe timing.

You want to set the crank to fully advanced position.

For 34° this is about 7.6mm down the bore

For 37° this is about 9.1mm down the bore

(Using a crank stroke of 74mm, rod length of 150mm, and degrees as above)

Using a DTI will get you fairly accurate.

Most electronic ignitions will have a hole in the stator plate and a dot on the magnetic rotor which you can line up in the middle of the hole in the stator plate. However the position is not accurate and sometimes its real timed position would be closer to one end of the hole or the other.


The only ignition I have known which is pretty spot on from static timing (when later checked with a strobe light) is the Trispark.

Since your means of using a strobe light are a little restricted I would suggest setting your static timing between the two numbers given above, say about 8.4mm from TDC. NOTE YOU WILL LOOSE A COUPLE OF DEGREES FROM THE ROCK OVER TDC where piston travel is measured at a micrometer level.

So, set about 8.4mm down the bore. Have your ignition stator with the dot of the rotor lined up the centre of the stator plate hole Stating: ANTI CLOCKWISE. When the stator plate has the fixing screws in the middle of the mounting slots.

Then go for a ride, take the bike up some steep hills, don't let the revs fall below 3000rpm when accelerating. 4000rpm if accelerating hard - especially up an incline. And see if the engine labours, pinks/knocks or lacks power. Then adjust accordingly.

[chrisx1]

My motor is a 1968 Lightning bottom end with an earlier Thunderbolt top. So does have the crank locating hole.
Im running a Boyer Mk3 so the info should be very helpful.
Thanks guys.