ignition timing marks


Hi.Does anyone know where to find the ignition timing marks on my 1995 993cc CB42 engine Hijet EFI van.I have removed the rubber grommet on the side of the gearbox to expose the flywheel,but no sign of any marks.I have also checked the crankshaft pulley and the area behind it but still no marks.Anyone know where they might have hidden them.Cheers,Oldcorn.