Bike runs fine but stalls when shifting into fith gear

Hmm. I had a similar issue with my bike years ago and it ended up being the coil.

http://www.lowrangeoffroad.com/index.php/sloppy-shifter-fix-bushings-and-bolts.html


common as nails issues.
all old suzuki's, even 1995s.

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.

MGM

Yamaha motorcycles of this vintage often have issues with their kickstand switch. This switch can be disabled by clipping the two wires that go into the switch and wiring them together--the kickstand switch is normally closed (letting current flow) when the stand is up; the switch is open when the kickstand is down.
This is more afield than your electrical concerns, but if the clutch plates have bonded together, the bike will stall when you put the bike into gear. The bike will start and idle fine, but basically, you don't have a working clutch, so the bike will stall out when you dump it into gear while at a standstill. You can test for this by starting the bike and having someone push the bike to get up to a little speed, then trying to shift into 2nd gear. If the bike lurches forward before stalling or keeps running, you have a clutch, not an electrical issue.
Folks sometimes get lucky, and working the clutch plates a few times will free up the sticking plates. I have had this problem with a mid-1970s vintage Honda that I don't ride very often. Eventually, the clutch plates free up and the bike is good to ride again.
Good luck!

Could it be that the bike stand is lowered there is a micro switch on these that kills the engine if you try put the bike in gear with the stand down

All VT 600 Honda Shadow had a 4-speed transmission.

Internal transmission problem. Shift fork, slide, or gear.

your loking doggs on you gears inside your gearbox are rounded and they wont lock into place.. there fore it jumps out of gear when its under load... so you need to split your motor/gearbox replace the damaged gears and most likly your selector forfk as they will bent bent.. costly excersize $900- 1500 job to get done... too many burn outs or power shifting not using your cluch... or lack of oil changes can cause this [email protected]

this may help,it doesnt sound like the clutch is out of adjustment,it sounds like the clutch plates have become stuck together,(this happens quite a bit if the bike has been parked for a while..ie over winter)..to fix it get the bike moving,down a drive way or something..then just bang it into gear,then shift into the highest gear you can by shifting without the clutch,once you have a bit of pace on simply hold the clutch lever in and work the throttle on and off all the while holding the clutch lever in,the clutch should free itself fairly quickly and should be back to normall,a lot of older bikes are good at doing this..hope this helps