Mag Timing Sequence
- spookefoote1956
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Mag Timing Sequence
Hello again. I've fitted the new (to me) N1 from our wonderful spares dept at Kettering and just want to check I'm doing the correct sequence for timing.
1. Put bike in gear 4th
2. Loosen mag nut in casing
3. Fully advance timing lever. Find TDC compression stroke. Check pushrods rotate, valves are closed.
4. Roll rear wheel back so that timimg tool in spark plug hole is 1/2" BTDC
5. Put fag paper in points and turn until it can be removed.
6. Tighten mag nut.
Or
Is it better to leave the mag nut tight and adjust the opening and position of the points via the Contact Breaker Securing Screw.
1. Put bike in gear 4th
2. Loosen mag nut in casing
3. Fully advance timing lever. Find TDC compression stroke. Check pushrods rotate, valves are closed.
4. Roll rear wheel back so that timimg tool in spark plug hole is 1/2" BTDC
5. Put fag paper in points and turn until it can be removed.
6. Tighten mag nut.
Or
Is it better to leave the mag nut tight and adjust the opening and position of the points via the Contact Breaker Securing Screw.
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
- ajscomboman
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- Location: HAMPSHIRE UK
Re: Mag Timing Sequence
Leave the mag nut tight and loosen the camshaft sprocket nut, you'll find it much easier to set the timing. As you have mentioned find TDC on firing stroke using the wheel in 4th gear, move backwards dropping the piston below 1/2" and then slowly bring back up to 1/2" as it removes any backlash. Rotate the mag points till they are just about to open then using a socket larger than the nut tap the camshaft sprocket back onto the taper and lock up the nut.
- spookefoote1956
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Re: Mag Timing Sequence
Thanks, much appreciated
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
-
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Re: Mag Timing Sequence
That's what I do except that I find it easier (more controllable to prevent inadvertent movement) to loosen the nut of the cam driving sprocket rather than the one on the mag. A sharp tap on the cam sprocket (using an oversized socket) tends to set that sprocket in place whilst I tighten its nut, then check point opening point again.
The mag armature shaft has little resistance from unwanted movement after setting its position and the armature has a 'flip point' at the points-opening position which makes it more difficult to keep it in the required position. If the sprocket nut is just loosened enough to be able to turn/set it to the required position there's more resistance to prevent it from turning.
(Ooops, I see my reply has crossed with Rob's).
EDIT - It's probably unnecessary to mention that the points gap should be set before doing the timing.
The mag armature shaft has little resistance from unwanted movement after setting its position and the armature has a 'flip point' at the points-opening position which makes it more difficult to keep it in the required position. If the sprocket nut is just loosened enough to be able to turn/set it to the required position there's more resistance to prevent it from turning.
(Ooops, I see my reply has crossed with Rob's).
EDIT - It's probably unnecessary to mention that the points gap should be set before doing the timing.
Last edited by SPRIDDLER on Thu Jul 21, 2022 8:03 pm, edited 1 time in total.
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
- ajscomboman
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Re: Mag Timing Sequence
Great minds and all that spring to mind Spridd's.SPRIDDLER wrote: ↑Thu Jul 21, 2022 7:54 pm That's what I do except that I find it easier (more controllable to prevent inadvertent movement) to loosen the nut of the cam driving sprocket rather than the one on the mag. A sharp tap on the cam sprocket (using an oversized socket) tends to set the sprocket in place whilst I tighten the cam sprocket nut, then check point opening point again.
The mag armature shaft has little resistance from unwanted movement after setting its position and the armature has a 'flip point' at the points-opening position which makes it more difficult to keep it in the required position. If the sprocket nut is just loosened enough to be able to turn/set it to the required position there's more resistance to prevent it from turning.
(Ooops, I see my reply has crossed with Rob's).
-
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Re: Mag Timing Sequence
Hmm. I may have learned that from your great mind back in the early 60's.
(Going off-air now to treat my great mind to the bobbing pony tails in the Germany vs Austria women's Euro 22 football quarter final ).
Last edited by SPRIDDLER on Thu Jul 21, 2022 8:41 pm, edited 1 time in total.
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
- spookefoote1956
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Re: Mag Timing Sequence
The nice man from the spares said I did not need to check the points gap as it would be spot on and invalidate the guarantee!
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
- spookefoote1956
- Member
- Posts: 1838
- Joined: Mon May 01, 2017 7:32 pm
- Location: Wales Innit
Re: Mag Timing Sequence
https://www.youtube.com/watch?v=FcMe3zbnWsMFound this cracking video on youtube
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
- Joker_Bones
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- Location: DORSET UK
Re: Mag Timing Sequence
I really like Dick Casey's videos, I've watched them all... Well all the AMC ones...
- Joker_Bones
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Re: Mag Timing Sequence
I like using a multimeter to see when the points open... The resistance across the points changes from continuity to about 6 ohm (the resistance of the LT coil) just as they open.