So what you doin with a Massey Ferguson battery?
You need one for a Fazer.....
How long have you had it on the optimate?
I would suggest at least 24 hrs.
Then fit to the bike & start up.
If it don't start ring the supplier, could be faulty.
Leave it on overnight. 24 hours should show some better signs.
You can leave an Optimate on for weeks.