Leak down tester is great. Sorry one more question. Is this a Vanguard or Intek V-Twin engine? Will make it easier for me to give instructions. Thanks.
Down load these manuals. I think they will help us.
http://www.mymowerparts.com/pdf/Briggs-&-Stratton-Parts-Manuals-IPL/446700-ms5195-0205.pdf
273521 Twin Cylinder OHV