Bayliner 1990 120hp L-Drive Shake
 

Looking for help diagnosing L-Drive problem. We bought a 1990 L-Drive
last spring. It had a rebuild Engine. We rebuild the drive between
the power head and the lower unit this winter. The current problem is
after driving for awhile (5-10minutes) it has a terrible power surge,
undersurge. Do not know how to describe it, but we are going along all
of a sudden it feels like we hit a rock. It feels like the Engine is
dieing and then suddenly re-engages giving a heck of a shock. This
will continue to happen, accept it is so vilant we slow down. We start
driving again, it seems to be fine. We start getting up to speed and
it re-occurrs. We can drive at slow speeds and it does not seem to
occur. I went by myself (less torque) and everything seemed fine for
about 3 minutes and then one big jerk. This one ended up breaking the
pivot linkage for the shift cable located by the lower unit. I suspect
a problem with the clutch in the lower unit, but wanted to ask if
anyone had similiar problems with L-Drive. I understand the lower unit
is the same used on outboard 90hp and 120hp units. The L-Drive was a
unique design that placed the motor behind the rear seat with a drive
shaft to the lower unit. If someone has experienced a similiar problem
on a regular outboard or an L-drive, I would appreciate knowing what
your solution was.

Thanks Eric