Hi Marcel,
I used 10/40 oil
Didn’t change the filter.
Front sproket is good not loose.
Cable adjusted when linked back to the clutch casing.
Gears shift smoothly.
On the dash it shows gears go down to 1st, up to Neutral, up to 3rd (doesn’t show 2nd ) up to 4th 5th and 6th.
When accelorating all is good up to around 48mpg then slipping starts.
It is a GV 125S efi , new last year.