/diy/ - Do It Yourself

Ok guys
bought a fixer upper like /diy suggested
Belts are a bit worn so replaced them and some pulleys worn replaced too
Dropped the deck off and cleaned up. When reattached the Baldes are engaging on start

When the cutting height is at its lowest its fine but when up high it chokes out

Seems like im forever adjusting back and forth. No answers on Google..not even belt diagrams for reference

Local mower centres don't want to know as it isnt from them or new

Wheres the go to for help?

Im adjusting the deck forward now but was told thats a big no no
But I don't know where else to adjust