1997 evinrude 200hp 2 stroke slow getting out of the water

[Jak3737]

We have a 1997 hydra sport CC with a 1997 evinrude 200hp 2stroke. We’re having trouble getting onto plane.

recently replaced lower engine brackets mid way down lower unit shortly after to find out the upper bracket needs to be replaced after some extreme engine shaking and trouble getting onto plane. In order to replace this the power head needs to be removed. While at it does it make sense for an engine rebuild? Compression in all cylinders reads between 100 and 110. There is some corrosion around the head gaskets.
The prop currently is a 4 blade 15”x17 pitch. WOT is about 5000rpm.

I guess my question is, is it a prop problem or a tired engine problem or the upper bracket vibration problem causing my issues with planing out?

 

[dingbat]

Prop problem…
I was running a 14.25 x 17, 4 blade @ 5300. Decent hole shoot. Held on pretty well in the slope but couldn’t get close to the WOT speeds advertised for my boat.

Dropped down to a 15 x 15, 3 blade. Now run @ 5800 and match the advertised speed.

Erosion of the cooling passage in the block in the area of the heads killed my last power head. New heads gaskets every year to try to keep it on service. Finally bit the bullet and dropped a new short block on it

 

[Jak3737]

Prop problem…
I was running a 14.25 x 17, 4 blade @ 5300. Decent hole shoot. Held on pretty well in the slope but couldn’t get close to the WOT speeds advertised for my boat.

Dropped down to a 15 x 15, 3 blade. Now run @ 5800 and match the advertised speed.

Erosion of the cooling passage in the block in the area of the heads killed my last power head. New heads gaskets every year to try to keep it on service. Finally bit the bullet and dropped a new short block on it

Thanks! I was thinking rpm was too low. After the engine mount replacement the mechanic is going to change the head gaskets and take a look at the cylinders and cooling passages. Hopefully just new gaskets will keep everything going.