I am on my second motor. The first was a 35HP envenrude about '82 the
current is 88HP Johnson about '88. Used the same controls on both
motors. Both motors demonstrated the same problem.

Motor starts and seems to run OK. Boat moves, but when I go to full
throttle, motor runs OK for a while and then, to quote from another
post, acts just like the motor is shifted into nutural. The motor
races and the boat stops going through the water.

One boat repair place said they could find nothing wrong with either
motor.

Another place suggested I had "spun the prop" and that I should
replace the prop. I put a brand new prop on, and the problem is still
happening. The props on both motors were hte kind with the "rubber
boot" inside.

Any ideas?