Troybilt

We have a Troy bilt model 42049 snow blower.  Starts fine , 1 - 2 pulls ,  it is well maintained.  my question - I've noticed @ full throttle blowing snow  # 2 speed ,  machine rpm's are good but  into a bit deeper snow it never seems to engage the governor ??  fast speed is 3400 rpm with a digital tach.  the machine is old but it is spotless not rust at all. oil changed every fall and a new plug.  ???    Thanks

That model # show's the machine but NO engine information at all.
 
Post back the ENGINE model #, make, etc.
 
Also, most engine are supposed to run at 3,600 RPM's (full throttle).
To increase the RPM's there's a spring attached to the governor.  
You have to put MORE tension (just a touch) to increase RPMs.
 
There may be a Phillip's head screw to adjust or simply bending a tab (attached to that spring)
to increase pressure.