1980 kz1000 wont go in gear

You may have an internal transmission problem or clutch issue. If you can shift the car into gear while running without using the clutch pedal, suspect a defective clutch

when was the clutch plate last replaced was it lately and the problem just started after the change
next there is a bush/bearing in the center of the crankshaft that failes/ dry and that seizes in the input shaft of the gear box and makes the clutch useless as it drives the box all the time
another thing is any oil or grease on the clutch lining will stick the plate to the flywheel face and cause a problem
if the clutch plates are old , the damper springs can come out /break and intere with the flywheel mounting bolts
removing the transmissions and checking the clutch assemblies will reveal the reason for the failure

It was a normal effect on those old engines.Try to roll it downhill with 2nd or 3rd gear in and pop the clutch to start it.However you must adjust the plate that carries the ignition coil (it is located behind the stator's rotor/magneto wheel) to the correct advance angle if this problem insists.It is part number 2 in the picture.http://partstream.arinet.com/Image?arik=s4v92978S7HV4vH84i3c&arib=SUZ&arim=IbMgUI0ORSbT264E03VzmA2&aria=qFhQrjJlZwkA1lGsp3MiEw2&ariz=3&ariv=http%3A%2F%2Fwww.babbittsonline.com%2Fsuzuki-motorcycle-parts

can you select gears with motor not running? ie dont need to use clutch to do this.
Is foot leaver jamming inside the car?
is clutch arm (or slave cyl) at bell housing jamming.
If above ok then looks like motor and clutch out time.

a common problem with those, amongst many other yamahas, is the starter clutch gear. if it's not the starter solenoid , most likely it's the starter clutch gear.

Chances are the new bars are a bit taller than the old bars. It sounds like the taller bars are making you stretch the clutch cable. No freeplay at all in the clutch lever, Right? If the clutch cable was not re-routed causing the stretch, the only thing you can do there is get shorter bars or get a longer cable from a similar bike or have a custom cable made at the shop. The blinkers is just an error in how the wiring was reconnected.

Can I get a “very helpful” rating on this answer?

you need to bleed the clutch system.. have someone pump the clutch pedal three or four times, hold it down and release the bleeder valve( make sure the person holds the pedal down till after you tighten the bleeder valve back down) repeat this four or five times or till the clutch pedal feels like it did before.. good luck keith...

it could be the clutch if ur clutch is not disengageing properly it wont let u and how old is the gear box u may find it is that if its old or u may also need to check the gearbox oil if that has not been changed in years since u brought the tractor it may have grit and dirt stoppin the gears movin perfectly, personaly i think ur gear box is nakered