What engine is in my pk125

[simonpk125]

Hi
I have bought a 1986 pk125 but didn’t check the engine number!
The number is V5X1M which should be a pk50 engine
It has a19/19 carb a 50mph speedometer and it’s too speed is an easily attainable 49mph it cruises at 45mph
This seems too fast for a standard 50
I’m confused as to what engine I have
Hmmm

[henri]

if theres short studs holding the barrel down its a 50-110cc engine , if studs go all the way through barrel an head its got to be a 125cc at least .an reaching 50 means its def not a 50cc .H