Scooterotica

I always thought the main purpose of having your scooter Dyno`d, was to get the jetting set, 2 people i know had theirs set up, one seized his the other was running a very grey plug when he took it out to check.
the first guy was running a GT186 with a 30mm Delorto and was fitted with a 115 main jet , too small i thought.
thoughts ?

Mine had a 135 in jetting below if any good

Carb Set up Series 2 GT186
30mm PHBH/Ron Moss X Box Filter
Pilot 55
Choke 70
Main Jet 135
Atomiser AV268
Slide 40
Needle X13 P2
Float Valve 300