Yeah I'm not quite clear on what that list means either! I know the fork tubes are the same diameter, I just don't know about length. I'll do some more hunting around.
In the mean time, I'll share some more progress on my timing debacle.
I got the Dyna S unit in the mail yesterday morning. I couldn't wait to get home and install it. Love getting new parts in the mail.
When I pulled the points and advance unit out, I noticed several unfortunate things..
1 - The locating pin between the cam and the advance unit was sticking out at a really weird angle. Rather that point straight out, it was sticking out at an angle. Further examination shows the hole had been ovalized. It looks like something tried to rip the pin out of the cam, and damaged the hole in the process. The pin itself seems ok.
2 - on the back of the advance, where the pin slots in, there is more damage. The slot has a heavy dimple in it, and is actually cracked! Further evidence the cam tried to spin but the advance mechanism resisted, pushing back against the locating pin.
3 - The points backing plate is bent away from the cam. Ah ha, this confirms my initial hypothesis from last week, when I found some non-factory screws had been used to secure the points to the backing plate. These screws stuck out way beyond the back of the backing plate, and would have gotten tangled in the advance.
So, my theory is the previous owner used these long screws. Then tried to fire up the bike, and the advance attempted to rotate, caught on the screws, which sheared off after wreaking havoc. The points plate was pushed out and away as the advance attempted to free itself and spin with the cam.
Two things which I can't explain - usually you'd rotate the engine by hand when setting the static timing, at which point you'd discover the error of longer bolts. Maybe he just never did this? And second, the front side of the advance unit doesn't appear to have any noticeable damage. Maybe I just missed it, but this seems odd to me.
I did find bits of shredded metal in the ignition housing though, and scarring along the circular inner walls of the housing, as if something was dragged around.
Anyway, I was bummed mainly about the damaged hole in the end of the cam. Nothing else really matters much. I have a spare advance. But the oval hole could be an issue. The Advance is able to move several degrees back and forth before you tighten down the nut, which could explain why my points plate had to rotate so far clockwise to get lined up.
I don't know if it's practical to repair the hole, vs replace the entire head and valve train with a complete donor head, given I also have a stuck exhaust stud and cracked casting next to it. Maybe I just bin the entire head and bolt on a good used one.
I also noticed the cam 'nose' wobbles quite a bit. Maybe close to 1mm wobble. I know there is typically some wobble, but this seems very extreme to me.... any input on that?
So I slapped the Dyna S on doing the best I could with the condition of my parts. And don't you know it runs like a dream anyway. Started much better, much crisper throttle. I was able to static time both pickups perfectly without much tweaking. All I had to do was use a smaller washer on one of the bolts which interfered a bit with a pickup. I also had to remove the plastic P-clip holding the wiring to the backing plate as it forced the wires against the spinning rotor.
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