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I suspect riding it home in a high gear needed lots of clutch slip - could be you have worn the clutch plates quite a lot and perhaps overheated it.
If it is a cable operated clutch, adjusting it might restore some functionality but as the gearchange is "stuck", clearly some dismantling will be needed and it would probably expose the clutch parts for inspection.
First, congrats on the most detailed problem description I have ever seen! Seriously, it does assist us.
All this is completely consistent with your clutch not releasing properly, meaning that the gearbox is still turning when the pedal is depressed. The syncros in the gearbox will then keep you out of gear, that is what they should do. You can indeed shift into higher gears however when driving as the gearbox revs more nearly match to what is needed. The jerking forward when you hit the starter is due to the poor old starter motor having to move the whole car instead of just the engine, because the clutch has not released !
Now as to why, it is likely that the clutch release fork has broken, inside the housing. I had this once with a Mazda, and symptoms were exactly as you describe. The gearbox has to be removed if this is the problem, and you should also then take the chance to renew the clutch, pressure and driven plate both, unless quite new.
Also a possible cause is a complete loss of clutch fluid if a hydraulic clutch, or a broken cable if that type of clutch. Loss of fluid in a hydraulic clutch can be easily checked in the fluid reservoir, and can occur if a hose splits
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If you are at idle, in neutral, with the clutch lever pulled all the way in, and you shift into gear and the engine dies, it is likely the switch at the clutch lever. When they fail the bike does not get the signal that the clutch is disengaged and it is safe to shift into gear. Have that switch checked. Some bikes also have a side stand switch, make sure your side stand is always up before putting you bike into gear.
Hey Michelle,,
This is something that will have to be looked into.. Sounds like the clutch may not be working.. it won't engage/disengage..(the clutch plates are stuck together - a common thing when older bikes sit for a while!!).. this will require the right side cover to be removed, the clutch cover plate removed, the clutch plates(fiber and metal) to be removed, then cleaned, oiled and everything re-installed in reverse order..with a new side cover gasket..
You MIGHT be able to put the bike in gear.. then try to push it (engine not running) with the clutch lever pulled in and get the clutch plates to break loose (seen this work a couple times)..
You SHOULD be able to push the bike(engine not running) in gear with the clutch lever pulled in!!!
There are brass or bronze sycronizers rings for each gear that help mesh each gear when shifted. Mostly likely they are worn and may need to be replaced. I would check the gear box fluid level and the clutch fluid level also.
You have a wire shorting out when you press the clutch. You will need to have help looking for it. Have someone set inside and press the clutch and look for a wire that is coming into contact with the linkage. Good Luck.
Somehow you have it stuck in two gears. If I remember correctly your shift mechanism is inside the unit. If so, you will need to remove the trans and the cover, then re-position the shift forks. If you get lucky, you may be able to free it up by wiggling the shift lever but I doubt it. Do not run it 'till you manage to free it up or you can break a gear. If you removed shifter when working on it, first check that you put it back in correctly before tearing everything apart!
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