What kind of oil in 03 500 vulcan for the gear case

Either the clutch slips or the gear jumps out. Chech your free travel in the clutch lever the end should move an inch before feeling clutch tension.
Drain the oil from the gear case and observe any metal fragments. anything larger than powder is serious damage and will get worse.
Worn gears, bearings fragmenting will destroy all the transmission as the chunks circulate in oil.
Flush with a quart of motor flush , Naptha, or diesel fuel. and drain completely
. REFILL to mark with proper specified gear oil.

there a small bolt missing on the front of my kawasaki 1500 nomad that r not there and a little fuel come out from time to time do u no what it call so i can get another one to put there ? and after changing the oil bike wont shift gears help ? only first gear

It sounds like a bad shift fork, shift drum or worn dogs on the gear itself. Very labor intensive. have remove engine from the frame and split the cases.

when i ride the coolent light comes on and the bike dies turn of the key and turn on and the bike goes again, if the bike sits and idles it,s all OK

Hi, I believe the oil is not the problem but change it anyway and the filter. The problem is the clutch may need to be replaced or adjusted. Also check gear box for noises there maybe more trouble.
Good luck.

On most of the older Kaw's they had a plastic oil gear and when this brakes then you will have no oil pressure. You can go here http://www.gadgetjq.com/gadgetsfixitpage.htm , his page has all the information on Vulcan Motorcycles that you would ever need to know. There is information on there on how to replace the plastic oil gear or the POG as we Vulcan riders call it.

I’m happy to help further over the phone at https://www.6ya.com/expert/al_e83b1941f9c0f302

there sould be a black plastic screw in plug on crank case should have a dip stick on it middle of motor make sure its motor oil not gear oil

Use any oil that is JASO MA certified motorcycle oil. 10w-40 for cold climate. 20w-50 for warm climate/touring. Car oils use different additives and may cause scoring in certain types of cam bearings. Do not use any oil that says " Energy Conserving " on the label . It will shorten the life of your wet clutch and transmission gears. If you choose Synthetic oils, they will help your bike run cooler and shift easier.

Pick up your oil at the kawasaki dealer. DO NOT USE REGULAR MOTOR OIL. Wet clutches act up will motor oi. Good Luck ,Ned

Any special oils or lubricants in the gearbox? Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. If in a hot area like Texas or New Mexico go with 20w50.

If the clutch still slips then go to a different mechanic and have him adjust the clutch. The first guy doesn't know what he is talking about.