1980 KZ550 Starter turns but Engine dosent

Hey all, 

On my KZ550 The engine turns manually. I got the electrical working and hit the starter. Starter whirred but the engine didnt turn. I removed the starter and bench tested it its working. I checked the gears on the starter and the starter clutch gear and they look fine. The Starter clutch turns only counterclockwise by hand. I am stumped any suggestions?

Try taking the plugs out so there is less load on the starter clutch, if the motor spins the starter clutch is likely slipping under load

I did try that the plugs are out and still doesnt turn over. Starter just spins

Does sound like starter clutch

Hmm yea i guess so I havent done that before is it difficult?