igor, you can get the owner's manual here:
http://www.briggsandstratton.com/engines/support/operators-manuals/?NTT=Enter+Engine+Model+Number

I'd need the model and type to direct you to the specific manual, but you can enter it yourself on that page. B&S are a bit anal retentive with their technical information (parts lists and service manuals), but Bruce is in the trade and probably has access.