I watched this movie once in the mid 1990s.  It involved a group of preteens who were always talking about “the yeti” but never actually saw it.  Scenes and details I can remember:

-kids go inside old woman’s home while she isn’t there and possibly destroy things inside

-girl walking accross bridge pushes boy riding bicycle on the railing of the bridge off into the water below

-there’s a recurring character who comes and goes, he’s a hobo boy who lives in the woods

-kids go to the woods to find the yeti

All I can remember from about 20 years ago.