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Timing light
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stubaker58
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February 15, 2020 - 7:19 pm
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Well, it’s not often a plan comes together!  

My D7 has been misbehaving and in giving it a thorough going over it became clear that I needed to know the exact point the points open i.e. I needed a timing light.  

The theory is simple, a bulb holder, battery and two wires to the points.  Hang on I thought, that sounds remarkably like a torch (flashlight for our friends across the pond). So a quick trawl of Amazon came up with a likely candidate for £3.49.  It turned out better than I could have hoped.  The ‘rubber’ cover peeled off giving access to the switch which I prised apart, removing the switchable contact and soldering wires onto the two contact bars. I reconnected the switch box, feeding the wires into it and out through the hole where the button had been (having cut the rubber sleeve to allow the wires through). A crocodile clip on each of the wires and hey presto a timing light!

If only Bantams were so straightforward!

(photos to follow).

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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stubaker58
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February 15, 2020 - 7:20 pm
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D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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NeilB
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February 15, 2020 - 7:30 pm
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I've got an adjustable timing light, what is it that you're pointing it at to set the timing though? thinking

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stubaker58
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February 15, 2020 - 8:04 pm
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It’s not a strobe, just a means of seeing when the points open for static timing, you connect it across the points. Points off cam = closed = light on, points just coming on cam = open = light goes out (plug would spark in a running engine).

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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NeilB
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February 16, 2020 - 10:03 am
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Gotcha, I was having a special momentthumbs-up

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bantammad
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February 16, 2020 - 10:53 am
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Hi bantammad ere must be some thing in the water I just had a bulb with two wires soldered to it one to filament feed the other to earth it’s not that I’m tight any bulb will do the torch sounds professional to me haha regards Les 

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Blue Heeler
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February 16, 2020 - 3:24 pm
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Very neat , I like it.

I`ve used an indicator bulb holder from a David Brown tractor faulty rear light assembly since 1977, but the bulb gets knocked occasionally and needs replacing....your creation looks bulletproof Stu.....and it can still be used as a torch 🙂

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Number6
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February 16, 2020 - 5:54 pm
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If this is magneto ignition, how do you get around that the primary winding, in parallel with the points,  is a virtual short to ground?

Unless you'r going to say, disconnect the primary windiing.

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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mikef
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February 16, 2020 - 6:38 pm
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Yes, quite right No.6, it won't work with a magneto unless you disconnect the primary winding, also make sure that you have the ignition switched off when you use the "torch" otherwise the bulb may blow. I suppose I am stating the obvious.
I posted a link to a device that I was given in a thread a while ago.
I can't remember who gave it to me but it works even with a magneto. Not sure if it's still available or how much it costs. See link below.
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Mike.

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bantammad
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February 16, 2020 - 6:42 pm
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Hi bantammad ere with a magneto to set or check point of points separating first remove the central bolt that will isolate the brass points carrier connect battery power through the points turn magneto check make and break of the points with your test light in series , regards Les 

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bantammad
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February 16, 2020 - 7:33 pm
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Hi bantammad ere forgot to add can be used to check points breaking on flywheel generator but as pointed out by mikef windings to be isolated first must have had an age thing Les 

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Number6
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February 17, 2020 - 8:56 pm
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mikef said
I posted a link to a device that I was given in a thread a while ago.
I can't remember who gave it to me but it works even with a magneto. Not sure if it's still available or how much it costs. See link below.
** Please log in to view **

Mike.  

Ah! Inductive reactance! There's clever isn't it. laugh

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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