I have an engine that is exhausting thick white smoke, has pretty good power, but the smoke is so thick you can't see the yard. I think the rings are bad, but I haven't done a compression test or leak down test yet. Can anyone provide me with or steer me to a manual? Engine info is as follows;
Briggs & Stratton 15 hp OHV vert shaft engine,
Family YBSXS.5012VP 274826
2 bar codes on enine cover;*283H070197E1*
*030801ZA01377*

http://www.willardssmallengines.com/shop/briggs-stratton/briggs-stratton-manuals-/briggs-stratton-repair-manual-272144-.html

You may want to check your oil for the smell of fuel and being over full, White smoke is a sign of fuel contamination from a non seating float valve in the carb......