1993 Daytona 900 Timing

https://www.dropbox.com/scl/fi/wicj...nual.pdf?rlkey=en4i8dii36zvbiawrcrtgr82z&dl=0
Does this help you at all?

 

The workshop manual that's available from that dropbox link will tell you how to check and/or set the timing.

With regards replacing the centre cylinder spark plug - BEFORE you remove the old one ... try to make sure there's no crap in the recess, i.e., blow it out with a high pressure airline; maybe squirt a LITTLE WD40 in there and stuff a lint free cloth down in the recess to soak up the WD and, hopefully, any mucky deposits down in that recess.

To remove the old plug you'll probably need a knuckle jointed plug spanner if you don't have the box type one that came with the tool kit. That won't make life particularly easy to install a new plug but the way I've done it in the past with a Hinckley Trident (same - but different) is to smear the plug thread LIGHTLY with Copper grease. Slip a short length of tubing - rubber or plastic - over the top end of the plug so that the plug is snug (poetry, too, eh?) in the tube but not too tightly gripped that it would need to be levered off! I think in the past I've used flexible fuel line hose but any rubber tube of a suitable diameter should work - you only need a length slightly longer than the depth of the plug recess - 5, maybe 6 inches - since you just need it to flex enough to clear the frame once you've lowered the plug into the recess and managed to GENTLY turn it to get the thread started. You need to be very careful to not cross-thread so be cautious when starting to turn the plug and try to screw it in as far as possible by hand and with the tubing still on before pulling the tubing off and tightening to torque with a proper plug or box spanner.

Hopefully Robert will then be your mother's brother and Fanny your father's sister.

Good luck.