There is a circlip behind the gasket. The only way to get it out is to pull the axis. This will destroy the oilseal (91201-PA9-004) and the circlip(90601-KV3-000 ), so you need new ones.
When ordering these at Tyga plus nut, buy their Valve puller, its more elegant than the claw hammer


http://tyga-performance.com/site/product_info.php?cPath=71_25&products_id=507&osCsid=85d6592095357a726af4b0d4ccbfa394
_________________
Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom