I have more then 2k contacts on other contacts, but i only want to sync the "my contacts".
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You cannot select which contacts to sync, but you can limit which groups are visible in the Contacts/Dialer apps:
Menu -> Display options.
Now only the selected contacts should be displayed.
Found the official Motorola video on Youtube talking about their Contacts app. At the 1:00 mark they start talking about managing groups. It sounds like you should be able to create a new group and assign your contacts there, and then select to display only that particular group. Give that a shot.