That is not the correct carb for it though.
The Collari carb is made of alloy, that Sirio one won't fit the throat in crank case - I had one of these engines about 8 years ago, loved it, still rate it as the best engine I've had.
Notice the nipple on the crankcase and the one at the backplate, these should be connected with a length of fuel line - it's a boost chamber arrangement. DO NOT run this engine without it being connected.
Edit
On 2nd glance that carb looks like it may fit, be sure to get it seated straight though.
If you don't want it I'll have it!!!
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