Idle continuously goes lower

[Josh white]

I don't know the model I can't see the small numbers well. It's a Craftsman push mower with a bag. It is self propelled with ability to run bag less after you put the open guard on and remove the bag. It starts perfect runs great for eight or nine minutes roughly. Then the idle and power starts to diminish. If you raise the mower up from the handle while it's running, tilting forward it will pick back up and run fine only for a minute or two. Then it's the same process. Fresh oil fresh gas basically a new mower. Any help please

 

[Rivets]

You are going to have to get someone to find the numbers for you. Without them we can give you a good answer, because it could be a variety of causes. Both engine numbers and unit numbers if possible.

 

[Josh white]

It looks like 917.376480 after the word model. 675 Briggs motor