Interesting timing adjustment idea, not quite correctly functional

ancientdad

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@Danager4792 saw this on FB and I have to say, this is a creative idea. Sadly it isn't exactly correct for the design of our 180° twins' ignition systems.

advance adjuster.png

On-the-fly timing adjustment with spring tension adjustment retention. Of course, that implies you could adjust both cylinders' timing together, except we all know a few things about our ignition systems that prevent this from being easily used (if at all), even if you notch the points cover to allow it permanently. As one smart commenter mentioned, the points gaps can change when moving the plate (unless you have one of those rare engines where the points plate fit is snug) and of course, the required gap manipulation to get both sides correctly timed with both sets of points on the same plate. Kudos for the creativity though. Too bad the OP was also oblivious to the right points wire terminal positioning which hasn't yet bitten him, or the unrelated but incorrect positioning of the left exhaust valve adjuster shaft and the use of an outside valve adjuster lock nut on the inside of the points area.
 
The British bike manufacturers had this concept on the handle bars. I remember my BSA Goldstar had a lever for advance and one for choke.
 
The British bike manufacturers had this concept on the handle bars. I remember my BSA Goldstar had a lever for advance and one for choke.
As did the Harleys back in the days of them having distributors, left hand grip was for advance, right for throttle. Of course, it worked on them because they only have one set of points on the plate.
 
Now that I look at it again, I wonder if this mechanism can actually be removed after the static timing is dialed in with the motor running. It would allow precise control over a small range and any angle at the timing plate is doubled at the rotor.

If those little threaded blocks have pins that insert into holes placed in the plate and bearing holder, it would be secure enough to get the job done.

Plus, the mechanism is completely useless if the screws are tight on the nuts that secure the timing plate.
 
Now that I look at it again, I wonder if this mechanism can actually be removed after the static timing is dialed in with the motor running. It would allow precise control over a small range and any angle at the timing plate is doubled at the rotor.

If those little threaded blocks have pins that insert into holes placed in the plate and bearing holder, it would be secure enough to get the job done.

Plus, the mechanism is completely useless if the screws are tight on the nuts that secure the timing plate.
That’s the “best” part. The plate isn’t fixed.
 
I guess it's good that I don't do Facebook, I only have to see stuff like this if someone posts it on the forum. 🤣

Did the post provide any explanation?
I’d have to go back and read exactly what meth-fueled logic went into it, but I think it was to battle loose springs on the advance mechanism.
 
I’d have to go back and read exactly what meth-fueled logic went into it, but I think it was to battle loose springs on the advance mechanism.
So, compensate on the fly then.... curious idea, riding around with no points cover. Better not get caught in the rain LOL
 
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