125-200cc What engine is this? I know is 125 thats it. Year and type?

My guess is 03-08 due to frame color and water pump housing?

The reed block looks different from my 07 though? Ask wallybean or motorspotz

The old owner of the bike means its a 2003 SM 125. The stator is the same as a SM but its no oil pump on it like a SM engine?

The frame is from a 1999 WR, but the previous owner has put in another engine and he is not shure what engine it is.

That looks like a 98-01. I think they went to the V-Force reed valve in 02. The bolt on sprocket is different though and I haven't seen that in the 00 and 01 motors I have worked on.

Do you know where the cables from the stator goes? Its 2 yellow and 2 black/red

Looks like an WR/WRE Bastard- its possible to swap the big clutchcasing to a WR/CR style to operate the powervalve without the electric motor

Wiring sounds like some kind of bastardized set up. Pull the ignition cover and take a pic so we can at least guess at what you have.

The wiring is WR 1999 and the old stator had 3 cables, one for the earth on the coil, one for the coil and one for the regulator. But on this engine its 4 cables, 2 yellow and 2 black and red

The WR lighting coil is producing AC and typically one lead is grounded at the stator. If it has two yellow leads then probably they are providing that ground wire to be brought up and sent with the other hot wire to a rectifier/regulator to be converted to DC. The two black and red wires are the issue. One is probably to go to the coil and the other is probably to go to ground at the coil. Now if this has been converted to a CR ignition then forget all that and you should have a red, green, red/white, and black/red wires. All these would go to a CDI. There would be no lighting circuit. This is why we need to see the setup with cover off and preferably with the flywheel removed. Something has been changed obviously from standard wiring.

The stator is the same as on WRE and SMS, is not a CR or WR stator