I have a 1994 1100 Shadow California 4 speed shaftdrive. The top gear have a destinctive whine at 50 mph...like an army truck. What could be the cause or is it straigt cut gears?

Not the speed sensor , misfire ? plug , plug wire etc..... Check engine light on ? Have diagnostic's done on the vehicle ,check misfire counters on mode 6 . Do you know what this is ? If not your best bet ,take it to a qualified repair shop.

Can you make the noise happen with your foot on the brake, trans in gear, and a little throttle? And does it go away in park & neutral? If yes to both questions you probably have a faulty thrust bearing in the torque convertor. If no to both questions you like have a faulty "input drum to pump cover thrust bearing." Either way the problem must be repaired ASAP or when the bearing fails it will be at the worst possible time, like in the middle of an intersection with a firetruck bearing down on you.

if only in certain gears its the trans need overhaulmwill be costly for hard parts

If it is coming from under the hood(whine)then the ac compressor is either low on oil,or it is about to go out.Sometimes ac compressors will last a good long time,but sometimes they whine right before they lock up.So look for some ac compressor problems.Have a mechanic check it out,but it will most likely need to be changed out(compressor and components).

Have the fuel pump tested sounds like it is not working as it should. It may be able to be repaired but most likely you will need it replaced this will sort out your issue. Raz,....

Its a loose connection on the speedo cable. its a b*tch to get to. I had the same problem on my truck, it would fluctuate in 5th gear on the highway. i spent the money and had a professional do it.

Since it ran fine before you "fixed" it, go back over the things you changed. Put the old spark plugs back in it. Double check all spark plug wires and ignition connections. Put the bike in a dark area and run it at night, can you see any arcing anywhere?

You rear planetary set is worn from a restricted cooler.

what gear are you in? does it go through all the gears? how many shifts do you feel? if you arnt getting through all the gears i would look into the valve body and the tcm also take it to autozone or any parts place and have them try to pull a code from the tcm, this will help diagnose if it is electrical, otherwise it is mechanical, good luck and take care
erik
ez automotive