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[RoSy]

When I put my bike on to the centre stand, the forks clonk when they reach full extension, I know what causes the noise I just wonder why the damping doesn't take care of it by slowing the fork extension down. On some of the old British bike there was a small secondary spring inserted in the fork on the full extension side to prevent this. I have 240ml per leg 10w oil in fork, may'be I need more?

[RoSy]

Just noticed in H's technical notes there is a second spring but can't make out what good it will do there, definitely no second spring in my EFI.

[ric]

Unfortunately too much oil inside the fork tube will reduce the air gap,affect your compression damping and result in damage to the oil seal.
However a small deviation from the recommended amount or height is permissible for fine tuning the suspension.
The small REBOUND spring with similar coiling to the main one is there to deal with excess energy at the point of fork extension. If your rebound springs are missing or the forks designed without them it would explain the clonk you are hearing as the forks fully extend.