Recoil start problem

 
My Flymo Lawnchief 400 with the Tecumseh Vantage 35 motor has developed
a
problem with the recoil start. I've removed the assembly from the
engine but
can't see an obvious cause. I'm a bit puzzled as to what
causes the dogs to
engage with the engine. Inertia alone is not enough
to cause them to pop out and
there doesn't seem to be a friction device
of any sort. I wonder if there should
be and it has worn and
disappeared. The machine has not had a great deal of use
and is in
general in very good condition. Any ideas?




--
el-D