300sx with 750sx with 155mm pump conversion

So I know I am probably going to have a bunch of haters hatin. But it's hard to hate when it works!
To me it's all about ballin on a budget and that's exactly what I have done here. And just so you know it's far from being finished

Anyways here is a little info on what I built and how I built it. I started with a kawasaki 300sx And gutted it completely. Then I got a 2000 sea doo xp 951 hull and cut out the hole pump cavity including the intake grate area. The reason I did this is because if I want parts to repair it or upgrades parts are easy to find. Intake grates, ride plates, steering cable, props , pumps wear rings and bearing kits are all off the xp and are direct bolt on!!!

Then I took the 300sx hull and cut the back pump section out and glassed in the xp pump section. The drive shaft hight got raised about and inch to help the hulls match up a little better. Then I mounted a js 440/550 bearing carrier to the (fire wall) bulk head what ever you wana call it. I used a aluminum drive shaft with the end of the xp shaft for the prop. This was the only machining work required and was nothing Majour to pull off

Now we are ready for the motor I used 750 sx motor and engine plate. And got some aluminum flat bar to mount to the original 300 mount glassed in the hull. Then mounted js 440/550 motor mounts Then put the motor in place lined up with the coupler then filled the gap from the from the motor plate to the mounts with some 2" angle then welded the angle to the mount.

Now at this point the rest is pretty well straight forward. Hook up exhaust, electrical , water, cables , fuel and boom your flipping waves in no time!
 

Attachments

  • image.jpg
    image.jpg
    176.4 KB · Views: 412
  • image.jpg
    image.jpg
    161.6 KB · Views: 382
  • image.jpg
    image.jpg
    101.2 KB · Views: 389
  • image.jpg
    image.jpg
    130.2 KB · Views: 404
  • image.jpg
    image.jpg
    110.5 KB · Views: 407
The latest and greatest is I sent my top end out to group k to get my 750 motor bored out and resleeved to a 850 big bore. Along with all the head and porting work done for a freestyle set up. I am still waiting to get these parts back then I can reassemble my motor.

Other than this it's been on hold at the moment But I will be working on it again soon because I want to make tubbies for the front of the hull. I'm also going to make a new handle poll with the intake hooked up to it. And then I will paint it and turf it to make it pretty.

But so far I built it fast and cheap to see if it was possible to back flip. And it's very possible. So more power is my biggest problem at the moment

Keep and eye out because in a couple months from now I'm sure it will be looking good and ready to go!!
 
The first 2 pic of the ski is how it sits. Those pics are with the pump in and how I had it when I was riding it the past summer

Like I said I didn't waste any more $$ or time making it pretty until I knew I was on the right path. And like I said now I know I'm on the right path and it flips as is all I can to is upgrade and make it even better!! So I'm looking forward to this summer to see how much it I proves.
 
Yes I have been poking away at it and constantly changing things to try and make it better I widend the front end and shaved the the front of the hull flat to take the v out of the front to get more pop of the waves instead of cutting threw the waves. My current problem is I don't have enough bottom end at the moment but I just installed a 6/12 impeller last night so hopefully that will fix my problem I will be out on it this weekend so at that time I will take pictures and a update on how it's working
 
Any recent pics?? Would love to see this as i have a spare 300SX laying around. Is there any motor that would "drop in" easier to these hulls than a 750? I'm not trying to get a full blown backflip ski, but would love to rip around on that little hull with some more power.
 
Top Bottom