I have a 1967 vespa 125 GT but the motor has been changed. the motor id is 0147983 is this a 125 or a 150?

starter solenoid position has moved, this can happen when tightening nuts,

Martin, Check the attached links,instruction and guides, last link is a free manual. Good luck
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Modern Vespa LX headlight bulb change
Vespa GTS 125 How to Change your Headlight Bulb
Vespa LX 125 HID Headlight Fitting Guide from HID4Vespa co uk http://www.vespaclub.org.pl/images/manualki/lx/LX150Workshop.pdf

Stephen: On the ModernVespa.com Website, Greasy 125 says: "ign coil on the stator or the ign. pickup (also on stator) would be my first guess.

after that, i'd move onto the cdi
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don't worry -the clunk noise is typical when changing gears on a Vespa 125 PX
- it is due to a very old fashioned construction in the gearbox (1940ies) see pictures:
you have to get used to that or change to a newer automatic type Vespa....

Buy a haynes or clymer manual soon

older Vespas without separate Oil-tanks need a premix of 1:50 oil in the gasoline - but yours is an automatic oil-mixer type.
check the oil-level-glass under the seat near the choke.
it must be full of oil - the oil tank can hold about 1 liter of 2-stroke oil. How much oil did you fill in?
Probably the previous owner removed the oil supply tube and filled always an oil-gasoline premix. You better ask him about it. If the tube was removed then there was no oil supplied to your engine and it got stuck and the engine bearings are blown.

did you put back the choke (under fuel switch)
- and better rev once high in neutral after succesful start until engine gets warm