FX-1 Best FX Mod annnnd GO!

[kevbo]

Yep, what he said. The Kawasaki swap is an easy way to make a big improvement. A properly done Yamaha swap is a lot more work but well worth it when powerful engines are used. It would be a lot less work if you could find a SJ tunnel. I never knew someone is making them for this purpose.

 

[kcmasterpiece]

Yep, what he said. The Kawasaki swap is an easy way to make a big improvement. A properly done Yamaha swap is a lot more work but well worth it when powerful engines are used. It would be a lot less work if you could find a SJ tunnel. I never knew someone is making them for this purpose.

I cut mine out of an SJ. tunnel and cavity all in one piece. lined it up and glassed it in. the longer sj tunnel sets back the pump about 2 inches and you can run sj grates and rideplates. i had to have a custom drive shaft made though...

 

[Idok]

I cut mine out of an SJ. tunnel and cavity all in one piece. lined it up and glassed it in. the longer sj tunnel sets back the pump about 2 inches and you can run sj grates and rideplates. i had to have a custom drive shaft made though...

this is essentially what an F1 pro is...

 

[kevbo]

I cut mine out of an SJ. tunnel and cavity all in one piece. lined it up and glassed it in. the longer sj tunnel sets back the pump about 2 inches and you can run sj grates and rideplates. i had to have a custom drive shaft made though...

I was able to use the stock FX1 shaft and SJ grates with the inlet up against the bulkhead. It would have been better to use a SJ shaft and mount the pump aft for a larger inlet radius and additional area.

 

[PowersportComposites]

Specifically what benefits to tubbies provide?

 

[redwood]

Fix steer and nose rocker, Awesome ride in the waves. Tubbies (chubbies) is my next move, and a mag pump.

 

[kcmasterpiece]

Specifically what benefits to tubbies provide?

Basically improves the handling of the hull. Adds buoyancy to the nose when in the faces of waves, and helps the hull carve when on the flats. Just an all around improvement in handling and a must for surf skis IMO.

 

[200%Absolut]

there are multiple option for the SJ tunnel.

FX1 shaft + grate against the bulkhead .
SJ shaft + whole tunnel setback 2 inch ( more cutting to the ride plate )
SJ shaft + grate against the bulkhead + spacer for the pump (what i choose)

Ride plate switch to sj isn't a good choice for me to much work for no gain ...

You can find pump tunnel and composite ride plate from Tom21 :bigok: