Frankenstein Genesis

[Bible Fan]

I have access to a free Genesis hull. How tough is it to drop in a Sea Doo 787 running premix?

[grumpy_steven]

Dropping it in would be a piece of cake. Getting to an actual running PWC might not be. You'd probably have to come up with creative solutions to address differences in how the motor attaches to the hull, the PTO coupling and exhaust, just to name a few. I've done a few Kawasaki FrankenSkis with Kawasaki motors and even those required some improvising.

[bfarnam]

I have access to a free Genesis hull. How tough is it to drop in a Sea Doo 787 running premix?

Is the hull completely stripped or only missing the engine?

Assuming it is missing the engine, the main issues will be you will have to make a custom engine mount, the output shaft on the 787 may need a custom adapter for the Genesis drive shaft, and the matching of the the Polaris 148 mm modular jet pump to the output of the 787.

I would try to find the genesis engine mount cross supports.. they bolt into the factory rubber engine mounts in the hull and to the bottom of the Genesis engine. Hopefully they will be close enough to the Sea Doo 787 that you could just drill new holes, other wise you will have to make a bracket to adapt it.

I don't know enough about the Sea Doo to offer any other help and perhaps some other guys here will have more info.

[K447]

I have access to a free Genesis hull.

How tough is it to drop in a Sea Doo 787 running premix?

How much power does that engine provide?

The Genesis is a big and heavy hull. You want at least 120HP and probably more.

[HiPeRcO]

It's going to be slooow with a 787 in it...(110HP?)

[Bible Fan]

The stock engine is a 1200 with 135 hp. The 787 makes 110 hp. I really liked my old genesis. I’ll be watching for a motor

[K447]

The stock engine is a 1200 with 135 hp. The 787 makes 110 hp. I really liked my old genesis. I’ll be watching for a motor

My opinion is that the Genesis hull really needs something closer to 200hp.

The red 1200 engine was ‘ok’ for power in that heavy hull but Polaris just did not have a stronger marine grade engine available. So the Genesis was stuck with the same ‘135’ hp motor that they used in everything from the two seater SLX to the four person Genesis.

[Bible Fan]

What motor would you put in a Genesis hull? Non power valve Yamaha 1200 with a milled head?

[K447]

What motor would you put in a Genesis hull? ...

If you are willing to do the fabrication work, a mildly supercharged 4-Tec engine would be nice. 215hp rated with the 4-Tec internal intercooler, 250+ hp with external intercooler.

Polaris jet pump tends to break the Polaris driveshaft above about 200 Hp, so when installing bigger power the Seadoo jet pump also needs to be grafted in.

The 4-stroke Yamaha engines tend to be tall so it might not fit under the Genesis seat. I really like the 1.8 liter Yamaha engine but it is a big lump of metal.

The Kawasaki 1500cc NON-supercharged engine is also quite nice. About 160hp stock. Measurements needed to confirm whether it would fit in there.

[Bible Fan]

K447, You are the man. Thanks for the info.

Should I mess with a Genesis at all? I like it for family riding; very comfortable and fast. Good for tubing. Maybe I'll just wait for a nice, stock Genesis to show up on Craigslist. I'm on the Chesapeake Bay, about 2 hours from the Polaris mecca of NJ.