650/X-2 650 x2 engine swap

[mx2strokes]

I have searched for info on the 750 engine swap and all I have found its bits and pieces, I know it may be simple but a step by step would be good.

What I am looking at is buying a 750 XI sit down, swapping the 750 into the x2 and then putting the 650 into the XI so that I can sell it on as a running maybe underpowered usable ski.

What do I need to use from the 750 to fit it into the X2, I plan on using the 750 electrics - do I need to do anything to them?
do I use the XI or X2 start stop switches?

I will mod the 650 exhaust ( found a good description on pwc today) until I can get a decent pipe., is there anything else I need to do - driveshaft ? engine mounts?

Will the 650 fit into the 750 XI ok? I guess if the 750 fits the x2 the 650 will fit the XI,

Looking forward to having more power..

 

[RivMan]

750 into an X2:
From the 750:
Engine
Intake / Carb
E-box
Maybe Throttle cable ?

From the 650:
Everything else (Bedplate, Mounts, Driveshaft, S/S switch, Exhaust manifold / pipe, etc...)

650 into an XI:
No idea, I would guess if you take the 650 E-box and coil, Engine, use 750 exhaust mani / Pipe, etc, you could make it work. You'll have to find a spot to mount the 650 electronics someplace.

-Rob

 

[mx2strokes]

750 into an X2:


650 into an XI:
No idea, I would guess if you take the 650 E-box and coil, Engine, use 750 exhaust mani / Pipe, etc, you could make it work. You'll have to find a spot to mount the 650 electronics someplace.

-Rob

I'll have to try and mount the XI e-box in the X2 as I believe its alot bigger, so I would think mounting the smaller X2 box in the massive Xi should be a doddle..

 

[Vumad]

Swap the motor, carb and electronics. The exhaust manifolds bolt right up. Leave the 750 manifold on the 650 in the XI, and run the stock 650 pipe on your new 750 motor. You might have to be creative with the throttle cable mounts, but otherwise just swap it all over.

After you get your XI sold, buy a performance 650 stand up exhaust for your new 750 motor.

You could swap the electronics, but that's a lot of effort. You can't just put 650 electronics on a 750 motor. To do that you have to tap both cases and swap the stators and flywheels.

 

[Austin]

The only thing I would think would be tuff about putting x2 electronics in the xi would be making a water proof box for the voltage regulater. But I would make a plate that bolts on to the xi where the old ebox did then mount all your x2 electronics on there and make a waterproofing case for the regulater to go on there.

But i also think it would be easier to just keep 650 electronics so you can keep the electronical pump motor for trim usable.

Then on the start and stop switch i would probably stick to the 650 one because the "xi switches incorporate trim control and they are big and bulky" (said by vumad). I guess its just what ever one you like more both will work.

I have heard too with the dual carbs You have to modify your support bar next to your carbs to accommodate duals, If your 750 has dual carbs. ( dont know if this is true or not if you have to modify that or not)

Right now I am doing a build/conversion with my x2 so I'm kinda learning as I go too.(winter x2 build)

 

[Vumad]

Yes, swap the switches over. The XISS switch is big and bulky and you should swap it over. Just get 2 sets of connector plugs and switch them over. Leave the XI trim disconnected. Like the trim is going to matter to someone willing to buy a ski with the wrong motor.

Yes, there are correct ways to do it, but if you are putting a 650 motor in teh Xi you are already doing it wrong. So just do it fast and get rid of it cheap.

Steps...
... Remove all the bolts that hold the electroncs in place, unplug the start/stop switches from the e-boxes
... Remove the 4 bolts that hold the bed plate to the motor mounts, disconnect the waterlines from the pump, unbolt the exhaust manifold (repeat with other ski)
... Remove the motor (unbolt anything still connected) (repeat with other ski)
... Swap the motors, replacing the 4 bedplate bolts, reconnecting the waterlines, bolt back on the exhausts
... Strap the 750 e-box to the X2 tank where the stock oil tank goes using the tank strap and maybe another strap
... Strap the 650 e-box somewhere nice on the XI
... Cut the connector plugs off that connect the start/stop switches to the ebox, buy 2 replacement connectors, swap the switches so the XI switch stay on the XI and the X2 switch stays on the X2 using the new connectors
... skip the trim on the Xi, it's w/e
... Sell the XI
... don't be disappointed when your 750 runs no better than your 650
... save money for a new pipe for your 750x2
... Buy new pipe, be happy with new power!

 

[Vumad]

The only thing I would think would be tuff about putting x2 electronics in the xi would be making a water proof box for the voltage regulater. But I would make a plate that bolts on to the xi where the old ebox did then mount all your x2 electronics on there and make a waterproofing case for the regulater to go on there.

You could get a 650sx E-box for cheap probably and put everything into it.

 

[Austin]

OH yeah didn't think of that! Might use that idea on the 650/550 conversion

 

[mx2strokes]

Wouldnt I be using the X2 ebox in the xi, so the reg and all electrics would be waterproofed in there?

Just wondering if getting a 750 sx or sxi would be a better option? Its just that I know for a 750 xi with a rebuilt engine and poss have a buyer for it as a 650.
Dont mind a bit of modding to fit the twin carbs, I am guessing the xi is twin carb??

What Impeller do I need? has a solas in it at the mo, not sure what model, but it was fitted many years ago.

the exhaust will be first on the shopping list once its done.

 

[Vumad]

Twin carbs fit u just have 2 grind the corner of the air box .

The x2 ebox is bolted to the steering so if u move the ebox half of it would be missiing

 

[Vumad]

9/17 prop unless u open the nozzle up then u can go bigger

Xi or sx doesn't matter. The stock sx pipe won't work in the x2. Xi is probably cheaper and resale w/ 650 easier.