Well, you are right, the mechanism does get floppy when the case and the shift lever is not there holding it in..but the inside shifter axle is an axle based in the left engine case...it is not very deep and it does come out if pulled...but shifting with the vise grips on the slot tab I am pushing it against the case so it works as it is supposed to.
The two parts the Y-shaped piece and the shift drum were stuck from 10 years of non-use and were finally freed up and it shifted better...finally, easily, by hand with the cover off.
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The spring you mention did get loose for
disonny, the original poster for this thread, their transmission/clutch picture is seen on page one comment #17 of this thread.
Helpful suggestions by the terrific members here with their shared wisdom and experience helped that person and probably a few others fix their transmissions. I learned from it, it helped me get mine working by studying that picture and the comments offered.
The picture in comment #17 does indeed show the spring in
disonny's bike not properly hooked.
Here are two pictures I posted in my longer step by step postings in my
'86 400 Enduro resurrection' thread.
The first picture shows the spring on mine properly (I hope, haha) installed.
The Y-shaped piece is in between two pins of the end of the shift drum showing it is in (some) gear.
The second picture shows what you refer to, showing how easy it is for the slotted shift level axle to come out of the shallow hole the axle rides in in the left side engine case.
The shifter axle easily goes back where it is supposed to, I pulled it out on purpose. To shift I am pushing against it while I rotate it and it stays in.
Do the springs look ok to you I hope??? You mentioned the angles and correct bend and such...this is the only spring I have or have ever seen so let me know? It seems to have enough tension to keep both legs onto the post. I suppose if it felt too sloppy one could wind the spring legs a bit tighter..but for know I will leave it as is.
Also important for me in the 'resurrection' thread is that this exposes the gear seen inside the axle hole, and no rust is seen on it..a reassuring thing as part of my evaluation of this new-to-me bike.
I have yet to get the shift lever axle out of the outer case..maybe tomorrow. Maybe the o-rings have crumbled..that seems to describe the progression from sloppy to tight to tighter to now stuck and frozen over a week period.
Thanks for the input,
Bodger