650/X-2 X2 project 701 ?

[catpower]

I've been searching and reading a lot about X2 options. so you all know I'm a long time owner of the B1 and performed my own mods. So mech work will not be a problem. I'll try to make this easy to follow. The X2 is bone stock so my questions and options are:
1. work with the existing 650cc but can I change out the 28mm carb and use a SBN 44? if so do I need to get the later version intake mani? if not what other options do I have?
2. Will the 44mm carb work well with stock pipe? proper jetting of course.
3. If the above mentioned works I plan on replacing the stock impeller that I've read about that needs changed for better low end response. Is this a good idea with near stock motor or do I need more pony first?
4. second option I have a stock 701 motor laying around. I know I don't need to ask that question but........
5. 701 option. more money to build. I need Rhass mount and coupler and pipe. Question is: searching for a Factory pipe that fits the X2 hull, what headpipe do I need from what hull design? Or any other AM pipes fit?
6. can I use the stock exhaust mani to bolt up to the FP headpipe?
7. I understand the B1 limited chamber will fit but $$$ so what other options do I have?
8. 701 also means E-box mounting and start and stop switch mods. I have not read much about this.
9. last min thought, maybe just install the stock 701 with stock exhaust. piping should be easy.
yes or no?

 

[jetx]

How much time do you have riding on the x2 right now? Is this a ski your committing to for the long haul?

If it’s a ski your comitting too tHan I’d build it the way you will ultimately want it, which if your coming from a blaster you’ll want the 701. It is definitely not the cheapest way to go but I feel for fun factor you’ll be happy with it.

I am building a 701 X2 myself this winter and ran a modified 750 last season with all the bolt ons, and although it was quite a bit of power and was relatively happy with it, I am more a fan of the Yamaha power band.

Pipes for the 701 from what I understand is a sj b pipe setup and may have to mold the tank to fit, blaster limited chamber or a fp Kawi 650 x2 pipe. You can probably come up with other concoctions of pipes that would fit but those are the best choices in my opinion, guys have even ran a powerfactor.

If this is a ski your just trying or a second ski I’d just stick with the basics and add pipe, carb, impeller to the 650.

 

[Aidan Burns]

I built a 701 x2 and rode it for a week...parted it out cause I wasn’t happy with it but that’s beside the point lol. Superjet mod b pipe fit Great, just had to melt the tank around it. Be ready to do something with the pump because it will not hook with a b piped 701....I had an sxr prop in it and scoop grate but it needed something else. Idk if a stuffer would do it or not. Never had experience with one. If you have any other questions let me know...was a lot of fun figuring out how to put it all together and make it work.


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[catpower]

I rode the X2 a little last summer, not impressed mostly because of lack of power. So if it had some grunt i might enjoy it more. I live on the water in the summer plus I now have an X2 and a 701 just sitting waiting to be married. No I really don't want to sink $1,000 plus in this ski but I'd probably get my money back if i had to so what the heck. This is a winter build to occupy my time. I will probably pull engine and play with the idea of a stock 701 thinking it will be more fun that a stock kawi 650 besides building up the kawi 650 looks spendy with less AM options anyway. All opinions welcome. keep them coming thanks.

 

[Aidan Burns]

I rode the X2 a little last summer, not impressed mostly because of lack of power. So if it had some grunt i might enjoy it more. I live on the water in the summer plus I now have an X2 and a 701 just sitting waiting to be married. No I really don't want to sink $1,000 plus in this ski but I'd probably get my money back if i had to so what the heck. This is a winter build to occupy my time. I will probably pull engine and play with the idea of a stock 701 thinking it will be more fun that a stock kawi 650 besides building up the kawi 650 looks spendy with less AM options anyway. All opinions welcome. keep them coming thanks.

A stock 701 I believe is almost double the hp of a 650 kawi so it will still be plenty fun.


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[jetx]

Don’t expect to get your money back out of it

 

[jetx]

I built a 701 x2 and rode it for a week...parted it out cause I wasn’t happy with it but that’s beside the point lol. Superjet mod b pipe fit Great, just had to melt the tank around it. Be ready to do something with the pump because it will not hook with a b piped 701....I had an sxr prop in it and scoop grate but it needed something else. Idk if a stuffer would do it or not. Never had experience with one. If you have any other questions let me know...was a lot of fun figuring out how to put it all together and make it work.


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What didn’t you like about it? Had you rode X2’s prior?

 

[Aidan Burns]

What didn’t you like about it? Had you rode X2’s prior?

Yes I do like x2’s, not my favorite but I enjoy them enough to have spent the time to put a 701 in one. I love the way they look mostly and mine had all the nice billet bits, umi steering, x2guy trim, etc. but I had a nasty vibration I couldn’t figure out and couldn’t get enough cooling from the pump for my setup...and I just didn’t like this ski enough to mess with it. I prefer my Yamaha stuff. Superjet and blaster. And Vxr...


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[jetx]

I gotcha

 

[catpower]

the X2 is free and the 701 complete cost me $200 so ive got some room to get money back

 

[ltr171]

Im building one now I'm just doing a stock 701 with the rhaas mount kit and fp manifold on a stock kawi 650 pipe. I actually have your old rhaas kit aidan lol.

 

[Vumad]

I've been searching and reading a lot about X2 options. so you all know I'm a long time owner of the B1 and performed my own mods. So mech work will not be a problem. I'll try to make this easy to follow. The X2 is bone stock so my questions and options are:
1. work with the existing 650cc but can I change out the 28mm carb and use a SBN 44? if so do I need to get the later version intake mani? if not what other options do I have?
2. Will the 44mm carb work well with stock pipe? proper jetting of course.
3. If the above mentioned works I plan on replacing the stock impeller that I've read about that needs changed for better low end response. Is this a good idea with near stock motor or do I need more pony first?
4. second option I have a stock 701 motor laying around. I know I don't need to ask that question but........
5. 701 option. more money to build. I need Rhass mount and coupler and pipe. Question is: searching for a Factory pipe that fits the X2 hull, what headpipe do I need from what hull design? Or any other AM pipes fit?
6. can I use the stock exhaust mani to bolt up to the FP headpipe?
7. I understand the B1 limited chamber will fit but $$$ so what other options do I have?
8. 701 also means E-box mounting and start and stop switch mods. I have not read much about this.
9. last min thought, maybe just install the stock 701 with stock exhaust. piping should be easy.
yes or no?

1) It will work much better with the 44.
2) It will be acceptable
3) Straight blade 15 should be cheap
4) n/a
5) Both SJ FPP. Google 701 X2 for pictures. I have a Superjet FPP limited chamber in my 750 X2. I had to melt the tank for it to fit.
The Kawi 750 FPP system does not fit with manifold, but does with a 650 manifold. I have been lead to believe the 800 system fits.
The B1 mod fits but not with the stock tank. Not sure on the B1 limited.
6) The stock kawi and yamaha manifolds do not work with the FPP system. AM 650 kawi manifolds do. The westcoast has thick casting and is a good choice to bore.
7) The B1 mod or SJ chamber are better choices based on my research, but B1 mod wont work with the stock tank.
8) I don't know, but I have been lead to believe that people have put the components into kawi boxes. Contact rad dudes since they sell a surf brace with ebox mount.
9) stock 701 exhaust does not fit in X2 hulls

 

[Mike W]

I bought my 95 bone stock. I rebuilt the motor, rebuilt the carb, installed a factory pipe, installed a lightened flywheel and a Hooker 9/15. With just these mods it made it a totally different ski and really woke up that little 650.

 

[catpower]

thanks Vumad
1. I still need the stock 38mm carb intake to make the 44mm carb bolt on correct? Yes/no
6. that was poorly worded question. disregard.
7. The only exhaust chamber that fits the X2 hull without difficulty is an AM exhaust system correct? Yes/no
next best choice for the money is?..... coffman?... SJ ?... B1 limited?... etc..... please advise first to last on availibilty and cost.
9. stock 701 exhaust chamber will not fit below hull? yes/no otherwise it appears simple enough to pipe the outlet to waterbox.

 

[cudaben]

I have yet to see a highly modded 701 not vibrate, regardless of hull. I rode B1 with a fresh very well built 701, FP, big waterbox, porting, etc etc etc... It had a noticeable vibration, a RN with similar setup did the same thing.

I personally have built several yamaha powered x2's from stock 650's to 701's to very built 771's, every single one of them had a bad off idle vibration. Regardless of mounts used, OEM SJ mounts, rhaas mounts, monkey grip mounts, and mixtures of those. My final conclusion is the big weighted rubber thing under the 701 that has to be removed to go into an x2 dampens the majority of the vibration in a SJ or WB. so in the X2 we feel it.

The way the power comes on with a 701 makes it a much more fun ski than a similar built 650 or 750 x2. I did those for years and finally made the change.

The closest thing I have felt to a well built 701 in an x2- was a full mod 750 x2- total loss MSD setup, ported 750, single 46, fancy reeds, coffman pipe, light billet driveshaft and drilled billet coupler. with a straight 15 prop!!!! this ski had room to improve too.



best bet if you just like to wrench and want to build something slightly different, do the 701, find a good coffman pipe on the forums or eBay, put on a SBN 44 carb and get a big hub prop with stiffer and ocean pro or rip turn nozzle. (assuming you want bottom end) save some coin and send the flywheel out to be lightened by speedysproket here or Newmiller on PWC2day. A high compression head will help out too(look for used) all this can be had for id guess $1500-$1900. If you hate the yamaha the only thing that won't transfer to a kawi engine would be the flywheel and head.

The pump with a larger diameter nozzle and big hub with a stuffer will hook plenty fine up to 120 +/- HP. My yamaha 771 w/ Nynja pipe, high comp head, fresh top end, fresh crank, fresh freestyle porting, dual 44's, force 2 reeds, lighted 61x flywheel and stator 9/16 skat with the red stuffer (forgot brand) and a ripturn was a handful. it flat out hauled ass. It hooked up well, not perfect but very well.

If a 760 with dual 44's was rated at roughly 90HP id guess mine made somewhere around 110-120 once tuned with all the mods. it was a night a day difference when i rebuilt it vs when it was stock.

use stock yamaha kill / on switch

once it is all said and done- disconnect your battery after every ride. mine started in my garage one night after a ride and I was out to dinner. hot seized the motor, blistered the paint on it, warped the head and fatigued the aluminum so terribly it was no longer machinable.

 

[Aidan Burns]

The WB and SJ do not have the rubber thing if I remember correctly?


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[cudaben]

that may explain why they too had vibrations LOL

 

[Aidan Burns]

Lol, yah I’m not sure. Vibration has never been bad in my yam skis. When I put one in the x2 it was almost unridably annoying. I parted it out after a week of riding after working on it for months.

But on second hand, that rubber I don’t believe is there for vibration, but for support when the motor squished down and it stops it against the hull.


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[cudaben]

I am no ski surgeon- that was just my 2 cents on the thing. i had spent some serious time aligning the couplers and had then dang near perfect. the off idle vibration rattled my teeth. very bad, but up at any higher rpms was non existent. Did this swap in 3 or 4 x2 hulls nows and currently working on a SC with it.

I did have to elongate the bearing support holes to allow for better alignment as well. I will also add the vibration when the couplers are not lined up was so bad it destroyed a pump bearing set and caused the impeller to beat itself to death in the pump- still did 49 mph on gps.

 

[catpower]

Ok so I'm trying to understand how a 701 motor will fit into an X2 hull using Rhaas bed plates. My research on the X indicated that the Factory Pipe 701 manifold is different than the Factory Pipe Kawi 650 manifold. I was hoping to use the FP mani for a 61X to bolt onto a FP headpipe made for the X2/SX Kawi. Do I have this understood correctly. will it fit?? My understanding is the 3 bolt hole pattern is rotated and will not allow head pipe and chamber to clear. Yes??