Thump from forks when lifting the front wheel . I have stripped the forks down and can find no faults any one any ideas 

Oil quality and level??

Oil Castrol 10 w 410 cc per leg 

 

My mate's Z had a similar problem, the forks were hydraulically locking as the oil level was too high despite draining and refilling with the correct quantity. 

Check the oil level by taking the top caps off and compressing the forks so that the springs are sticking out.  Then make up a dipstick to check how far down the fork leg the oil level is (from the stanchion top edge).  You want at least 150mm air space.

 

Hope that helps.

Edited November 12, 20178 yr by walter_neff

I will check for air gap and see how I get on thank you