Simple Boyer question.

AussieCombat · May 18, 2012

Which way do I move the slotted backing plate, for advance.
Having an issue, as we speak, with no timing light, and someone has borrowed
my trailer.
Thanks, AC.

ashman · May 18, 2012

Hi Ian should be anticlock wise the same way as your cam turns, I have never used a timing light I just advance it till I get a bit of kick back then back it off a little till its runs great, I do this with my Joe Hunt maggie as well.

Ashley

AussieCombat · May 18, 2012

Thanks mate.

cyclegeezer · May 18, 2012

If your cam turns counter-clockwise as it does on a Norton, rotating the points/pickup plate clockwise will advance the spark.

AussieCombat · May 18, 2012

OK, THAT'S ONE FOR THE LEFT AND ONE FOR THE RIGHT,
Any ADVANCE on that.??
While I'm on it....
How do I move that plate with the engine running.
After loosening the nuts, can I lever the plate around by putting a screw driver in between the locking
nut and the coil (?) or can I touch the coils by hand or gently tap the coil.
The adjustment is nearly right around to one end of the slot, so not much room to play.
If the timing has slipped,.... am I right in assumeing that the spinning rotor (?) would need
to be moved in the opposite direction to the plate, to achieve the same result.
That is,.. if I need more advance, and am out of adjustment.
Does that make sense.
Sorry if I'm not useing the right terms (names) here, but have had very little to do
with electrics.
AC.

marinecommando · May 19, 2012

On the points end the cam turns clockwise, so move it right, clockwise to advance.

marinecommando · May 19, 2012

If you set your timing staticley to 28' BTDC the marks on the rotor should roughly be in line with the hole where the trigger wires come through the case. Mak sure you use the correct timing mark on the stator, there are 2. You can rotate the place by hand using the coils, just back of the pillar bolts till you can move it. I find if you put a mark on the plate and one opposite on the timing cover you can guesstimate the degrees you are moving it.

L.A.B. · May 19, 2012

marinecommando said:
On the points end the cam turns clockwise, so move it right, clockwise to advance.

The cam rotates anticlockwise on a Commando when viewed from the right hand side, the AAU or EI pickup plate must be turned in the opposite direction of cam rotation to advance.

(Triumph cam rotation is clockwise)

AussieCombat said:
How do I move that plate with the engine running.

Once the pillar bolts have been slackened the pickup plate should turn easily by gently pushing against the coils.

AussieCombat said:
The adjustment is nearly right around to one end of the slot, so not much room to play.
If the timing has slipped,.... am I right in assumeing that the spinning rotor (?) would need
to be moved in the opposite direction to the plate, to achieve the same result.
That is,.. if I need more advance, and am out of adjustment.

Yes, if you run out of slot adjustment then the rotor will need to be repositioned.

MFB · May 19, 2012

L.A.B. said:
The cam rotates anticlockwise on a Commando when viewed from the right hand side, the AAU or EI pickup plate must be turned in the opposite direction of cam rotation to advance.

Here is my vote for turning the back plate clockwise to advance the spark. If you turn the plate in the same direction that the cam is turning, it stands to reason that the spark will occur later, ie RETARDING the ignition.

madass140 · May 19, 2012

L.A.B. and MFB are both correct, I cant believe the other opinions , yep the other way for Triumphs, its not rocket science.

AussieCombat · May 23, 2012

Ok, thanks for the help.
If I had have sat down and thought about it, I may have realised that turning in the opposite
direction to rotation, would obviously advance the spark.
Right, explain this......
The bike sat for a couple of weeks while I was waiting for a pair of needles to arrive from Jim.
Fitted them, started him up,.... First thing I noticed was the Idle had risen quite a lot.
That's OK, it was to be expected with the finer primary taper,... next thing....
foof, foof, BANG, foof, BANG, out of the left pipe.
What the hell ??, took me by supprise a bit.
I have enough trouble with the neighbours as it is.
Couldn't think of any reason for it to be the new needles, but whipped them straight out, cleaned
the carbs meticulously, and refitted the old needles and new plugs, synched the carbs again.. No change.
Alrighty then,.. We move on to timing.
Nothing was loose, but a bit of advance and it seems good again.
What happened ?
Also,was it really only on one side, or was that my poor hearing.??
When it stops raining, I can ride it, then go back to trying the needles.
AC.

pommie john · May 23, 2012

AussieCombat said:
Ok, thanks for the help.
If I had have sat down and thought about it, I may have realised that turning in the opposite
direction to rotation, would obviously advance the spark.
Right, explain this......
The bike sat for a couple of weeks while I was waiting for a pair of needles to arrive from Jim.
Fitted them, started him up,.... First thing I noticed was the Idle had risen quite a lot.
That's OK, it was to be expected with the finer primary taper,... next thing....
foof, foof, BANG, foof, BANG, out of the left pipe.
What the hell ??, took me by supprise a bit.
I have enough trouble with the neighbours as it is.
Couldn't think of any reason for it to be the new needles, but whipped them straight out, cleaned
the carbs meticulously, and refitted the old needles and new plugs, synched the carbs again.. No change.
Alrighty then,.. We move on to timing.
Nothing was loose, but a bit of advance and it seems good again.
What happened ?
Also,was it really only on one side, or was that my poor hearing.??
When it stops raining, I can ride it, then go back to trying the needles.
AC.

Poor voltage can play havoc with the Boyer's timing curve. Worth checking that.

Simple Boyer question.

AussieCombat

ashman

AussieCombat

cyclegeezer

AussieCombat

marinecommando

marinecommando

L.A.B.

Moderator

MFB

madass140

AussieCombat

pommie john

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