Author Topic: Timing changed by itself?  (Read 878 times)

Offline Johnny J

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Timing changed by itself?
« on: 09.06. 2015 16:55 »
My bike has been quite easy to start and has run good, but after a longer trip (300km) last weekend it doesn't any more.
Now it kicks back quite severly, takes more kicks to start and pings alot.

Guess I have automatic timing, (GF 1960) what could have happened?
Can it change to more advanced timing by itself?
What else could have influenced this?
   Gothenburg, Sweden

Offline bsa-bill

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Re: Timing changed by itself?
« Reply #1 on: 09.06. 2015 17:00 »
Possibly stuck open (in advance), broken spring or springs, or fibre drive gear has stripped a cog or two and it's moved the timing
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Online orabanda

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Re: Timing changed by itself?
« Reply #2 on: 09.06. 2015 17:05 »
I had a similar experience; the lock nut on the points loosened, and the points gap had increased - check points gap is 0.012" - 0.013"

Richard

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Re: Timing changed by itself?
« Reply #3 on: 09.06. 2015 17:50 »
I had a similar experience; the lock nut on the points loosened, and the points gap had increased - check points gap is 0.012" - 0.013"

That's my guess also.

Offline Johnny J

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Re: Timing changed by itself?
« Reply #4 on: 09.06. 2015 20:20 »
OK, thank's guys, will check this as soon as my back pain has eased of a bit.  *lol*
   Gothenburg, Sweden

Online morris

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Re: Timing changed by itself?
« Reply #5 on: 09.06. 2015 21:26 »
OK, thank's guys, will check this as soon as my back pain has eased of a bit.  *lol*

Don't tell me the kick has hit you in the back...??  *conf2* *countdown*
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Offline Johnny J

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Re: Timing changed by itself?
« Reply #6 on: 09.06. 2015 22:42 »
Yeah, I was sitting on the footpeg and leaning back rapidly to start it. ;-)

No I have had this back problem for some time now, sucks...
   Gothenburg, Sweden

Offline Johnny J

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Re: Timing changed by itself?
« Reply #7 on: 28.06. 2015 18:22 »
Anyone familiar with how to adjust these points?
   Gothenburg, Sweden

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Re: Timing changed by itself?
« Reply #8 on: 28.06. 2015 18:32 »
Loosen the screw and the baseplate can be moved allowing the points gap to be set.

Offline Johnny J

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Re: Timing changed by itself?
« Reply #9 on: 28.06. 2015 19:13 »
Thanks!

Is it normal that you can turn the plate (or is it the whole inner of the magneto) by hand a few degrees left and right or should it be totally rigid?
   Gothenburg, Sweden

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Re: Timing changed by itself?
« Reply #10 on: 28.06. 2015 19:20 »
If you have an automatic advance and retard unit the magneto shaft will move a few degrees as the weights are forced out. The points base-plate must not move in relation to the magneto shaft.

Offline Johnny J

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Re: Timing changed by itself?
« Reply #11 on: 28.06. 2015 20:00 »
Seems like adjusting the points did the trick, it started on the first kick!
The point were too close, took them to 0.012".
   Gothenburg, Sweden

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Re: Timing changed by itself?
« Reply #12 on: 28.06. 2015 20:24 »
Remember that the points gap affects ignition timing: Too close and the timing will be late, (retarded). Too wide and the spark will be early, (advanced)

Offline Johnny J

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Re: Timing changed by itself?
« Reply #13 on: 28.06. 2015 21:23 »
Yes, I will see how it runs in a couple of days, especially when warm.
Have to stuff myself with pain killers first...  *conf*
   Gothenburg, Sweden

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Re: Timing changed by itself?
« Reply #14 on: 28.06. 2015 22:27 »
There's a little oil wick in the cam ring.

Some light machine oil on it might slow the wear down.