Looks a little like AM

Wait a while and it will stabilies. There is no way to make any modulator with any circuits combination just out of R L and C. RLC are linear components they can just increase or decrease voltage in amplitude or phase, nothing else. What you see in your circuit is ringing because of nonlinear start point. To start with zero harmonics (no ringing) would need a slow increase rampup of generator voltage over an infinite time. Now EC handels inductors as perfect with no resistance and ringing can easily made visible.

Not AM, sorry. You're just seeing some ringing, as @Hurz said. It's also due to the fact that the simulation rate is so slow at 10kHz. The period is 100 microseconds. What looks like forever on the scope here, is actually the blink of an eye in real time. Slow down your frequency so something less than 1kHz or do, and the simulation rate will increase. Then there won't be any ringing (or at least the sim speed will be fast enough that you won't see it). Then you'll be able to see there's no AM going on.

The same effect takes place when you do a FFT. This effect can be reduced with a window function or in your circuit with some more resistive componantes to lower Q. Window function like Gauss or Kaiser or Hamming or Blackman........ but the simulator does not use window function in startup and just starts from 0V to instance 10V sinwave and this will cause a nonlinear voltage jump to your totaly linear circuit and will cause ringing. To make it clear, the simulation is not wrong, it just shows how it would look like if you have thoses perfect components. In reality the 100uH might have a resistance of maybe about 100mOhm this already would drastical reduce the ringing

I know that its not AM, hence the title guys... But, thanks for the comments anyway

You are right, the wave is actually like AM and you can think of doing a AM single ton transmitter out of it. BTW I just wrote so much because i had the hope you know already its not pure AM ;-) the ringing effect must just be trigger at the right point in time and you have a nice AM signal.

Thanks^^ i learned about all of this, need to take a look at an AM- transmitter for a little, so i can build an actual one