Start with simple word searches in the "Lookup by key phrase"
section such as "carburetor" or
"gasket". If this produces too many results, add
another word to your search phrase until you get a phrase
that produces a manageable set of results.
In "Lookup by
key phrase", leave out common words such as "of", "or", "and", etc.
These words may produce huge sets of results that have
nothing to do with what you're actually looking for.
up parts by Make and Model when possible; this produces a
much more reliable set of results.