Does the tach read 7500? Check through the logbooks. If logs add do up to
the 7500tt, there should be something saying the Hobbs was installed or
replaced at sometime later. I wouldn't think that there would be that much
difference between the tach and Hobbs if they were both zero when new.

I suppose it 'could' be a defective Hobbs. (?)

"Paul Folbrecht" wrote in message
...
My C152 has about 7500 TT logged but the hobbs shows about 3900. Does
this make any sense? Perhaps the hourmeter was replaced?