I got my gz running! Been some time since I posted on this forum.
To fill in I have since replaced piston, cylinder with chinese parts. New Nasaki Head assembly from alibaba or Aliexpress.
https://m.aliexpress.com/item/327981...mend-recommend
During putting new head cover on the new gn250 assembly I didnt realize the C-clip wasnt in the groove in assembly, so when I torqued down the head cover I cracked a brand new part. So I used my original 2005 gz head cover and rockers.
Using a new gn250 camshaft.
Anyhow, Im happy to get running but seems a lot louder than before or some other issue.
I do read where people say our gz's are loud tapping bikes its normal.
Im thinking I need to readjust valves a little tighter than 0.08mm intake and 0.13mm exhaust. I thought maybe I used wrong units last time I adjusted valves.
Next camchain tensioner and I might need a need new cam chain?
The rockers are worn so maybe I need to swap out older worn rockers with the new rockers since head cover is still good.