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Likely the problem is in your model definition, i.e. what you are binding to the combobox.

According with your definition your JavaScript should be something like:

var dataSource = new kendo.data.DataSource({
    type: "odata",
    transport: {
        ...
    }
});

var model = new kendo.observable({
    dataSourceType: dataSource,
    model : { Id: 2 }
});
kendo.bind($("#type"), model);

Where 2 is the value that you want as default (initial) value.

Realize that I have had to declare an extra model for Id since you say in your data-bind definition that value is model.Id.

var model = new kendo.observable({
    dataSourceType: dataSource,
    Id: 2
});
kendo.bind($("#type"), model);

And then you should define the HTML as:

<input id="type"
    data-role="combobox"
    data-value-primitive="true"
    data-auto-bind="true"
    data-text-field="Name"
    data-value-field="Id"
    data-bind="value: Id, source: dataSourceType">
$(document).ready(function() {
  var dataSource = new kendo.data.DataSource({
    type: "odata",
    serverFiltering: true,
    transport: {
      read: {
        url: "http://demos.telerik.com/kendo-ui/service/Northwind.svc/Products",
      }
    }
  });
  var model = new kendo.observable({
    dataSourceType: dataSource,
    Id: 2
  });
  kendo.bind($("#cbox"), model);

});
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.3.1119/styles/kendo.common.min.css" />
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.3.1119/styles/kendo.default.min.css" />
<script src="http://cdn.kendostatic.com/2014.3.1119/js/jquery.min.js"></script>
<script src="http://cdn.kendostatic.com/2014.3.1119/js/kendo.all.min.js"></script>

<input id="cbox"
       data-role="combobox"
       data-value-primitive="true"
       data-auto-bind="true"
       data-text-field="ProductName"
       data-value-field="ProductID"
       data-bind="value: Id, source: dataSourceType">

javascript - Kendo Ui combobox - set default value - Stack Overflow

javascript mvvm kendo-ui kendo-combobox
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javascript - Kendo Ui combobox - set default value - Stack Overflow

javascript mvvm kendo-ui kendo-combobox
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You can achieve like this.

var combobox = $("#kendoitems").data("kendoComboBox");
combobox.select(1);

javascript - Kendo Ui combobox - set default value - Stack Overflow

javascript mvvm kendo-ui kendo-combobox