Your engine was made on 7 August 2007. It is 9 cubic inches (148 cc) displacement, is of the 30th design generation, has a vertical crankshaft and a Vacu-Jet carburetor, has plain main bearings, and has a rewind starter. Here is the operator's manual:
http://bsintek.basco.com/BriggsDocumentDisplay/msvtDR-K_ny7tH217FzoPu.pdf

Here is the illustrated parts list:
http://bsintek.basco.com/BriggsDocumentDisplay/18kvuIXSnfBhU7y.pdf

I'm told the Chinese Briggs engines have some ribs cast into the engine crankcase, which American Briggs engines do not have. If you take some pictures of the engine's crankcase from various angles, Joe Carroll or someone else who knows the answer will be able to tell you whether it has the ribs.
[/b]Post-Edit: that engine has Plant Number 51 in its Code. There is no such plant - that is an administrative center at Briggs HQ in Wauwatosa, Wisconsin. Briggs seems to have adopted a practice of marking engines exported from Chongqing in this way - you can pick them by them having a plant number in the 50s.[b]

The small governor spring sets the speed for the "governed idle" - your engine has no idle speed screw, and the idle speed is adjusted by bending the special bracket that holds the stationary end of the small spring. The large spring sets the engine speed whenever the speed control lever is above the idle position.

Here is the illustration from the workshop manual showing what your governor control should look like:
[Linked Image]

We need views of your governor control from directly above, and from the angle used in the workshop manual illustration. I think you can easily see where your idle speed spring should be attached, but at present I am unsure how your remote speed control cable is connected. It does not seem to be connected to the point shown in the workshop manual illustration. However even if it were not connected at all, you could still control the engine's speed, and switch it off and on, by using the speed control lever on the governor plate, circled in yellow:
[Linked Image]

Please confirm for us in your next post where the engine end of the remote speed control cable (the handlebar end of the same cable goes to the lever on the handlebar) currently goes. It looks as if it may be the cable end circled in red on the above photograph. I do not know whether that attachment point is part of the movable speed control lever, or is a fixed, stationary anchor point. Can you post pictures of that lever with the handlebar speed control lever in two positions, please: full speed, and stop. Then we can see how the lever operates.

Last edited by grumpy; 26/10/14 09:31 PM. Reason: Add post-edit