Joe Henner Kove 450 Flywheel advance key
Flywheel puller required is right hand thread M28 P1.0 internal thread. GPX do not sell them but they are widely available. Search facebook GPX pages for fitting instructions. If you are insure , do not attempt and obtain the services of a professional .
You may also decide to fit a new gasket and we may have that in stock right now, or you could reapply the original gasket on its own or using gasket sealant.