when did they start putting a prop hub in OMC?

[leeprice72]

Hopefully the hub is the issue. Borrow a prop from a prop shop and verify this. Sometimes when they spin the hub you can see a little melted rubber where it meets metal. You can often tell when you spin one while its happening. After the prop I would check compression just to rule it out. My money would be on dirty carbs if its not the prop hub.