Motorcycle help needed!?

Hi have just done my cbt and am buying a 125cc motorbike, came across an rs50 with a 125cc engine fitted, would this be reliable/safe?
Thanks

Here is some more info to the bike if helpful:

I have for sale an Aprillia RS50 Chesterfield, made for a short time with single sided swing arm. Brand new 125 big valve

Hi have just done my cbt and am buying a 125cc motorbike, came across an rs50 with a 125cc engine fitted, would this be reliable/safe?
Thanks

Here is some more info to the bike if helpful:

I have for sale an Aprillia RS50 Chesterfield, made for a short time with single sided swing arm. Brand new 125 big valve 4speed manual pit bike engine, big bore Mikuni carb and matched exhaust can and taller gearing.It is registered 1/6/1998 with V5c and still shows 49cc and will be up to the new owner to change this (assuming they want to). It has a DAYLIGHT MOT, that means it has no indicators but has stoplight,horn and speedo as required by law for a daylight MOT. The bike has been built to the bare minimum for weight saving.

Best Answer:

Guy127: "…would this be reliable/safe…"
Since it's been built by some chimp in their shed, almost certainly not.

They have never bothered to register the bike as a 125. That makes it illegal to ride on any U.K. roads.
It's been fitted with a pit bike engine, which will not be homologated for road use. That will make it almost impossible to get it through the M.S.V.A. test, in order to get it road legal (which is why the current owner hasn't bothered).
Even if you do get it road legal, it will be regarded as a modified machine by every insurance company in Britain, which will double (or even triple) the cost of insuring it, compared to a standard 125.
Why bother buying somebody else's half built pile of junk, when you can buy a perfectly good, standard 125cc machine instead?

Other answer:

Guy127:
That scooter wasent built to handle More then 10 hp I wouldn't feel safe riding it to many unknown factors I don't think that chain would be able to handle that power it may look like a bike but it's not legally a bike
Bertsta:
So it's been blown up, had a weak Chinese four speed donk bodged in, it's been smashed up and lost most of the lighting system, and the previous owner was a chump who rode it illegally, and therefore by his own admission is a criminal. Good luck with that bro.
Tim D:
Don't touch it.

Apart from anything else you wouldn't ever be legal and wouldn't be able to ride at night.