701 swap

[COwakerider]

Alright so I am throwing a 701 in my x and don't want to roll a modded plate. I want to grind the hull and glass fixed mounts so I can use the 701 bedrails. I was planning on making a metal frame for the yamaha mounts to attach to and placing them with industrial epoxy. then glassing or laying carbon over that. has anyone ever ground out all the ridges? I was going to go up the side walls about 6 inches, this gets past the bond line anyway for reinforcement. Will this be sufficent, or am i going to compromise strength? What type and weight material would you suggest? thanks in advance

 

[Motorheads5]

checkout crab's build http://www.x-h2o.com/threads/9768&highlight=crab+x-2

 

[wayne]

http://www.x-h2o.com/threads/31677

here is a custom plate that you need to do the 701 conversion.

 

[COwakerider]

YEAH.... So I don't want to do a modded bedplate. It may just be my perfectionist nature but pulling my lower crank case bolts out and replacing with longer ones and now relying on the bolts that normally hold my bottom end together to also hold my engine snug as a bug just don't sit right with me. This subject it to new for anyone to say for sure that the added stress on my cases aren't going to cause a issue. warped cases, crank damage, who knows? Thus where I am at. I know some of you guys have alot of glass and carbon experience, so me some love!!!

 

[wayne]

thats a lot of work just to do a conversion. do a build thread when you decide to start chopping.

 

[shawn_NJ]

Your thought process is right on. I have not personally ground down the ridges on the bottom deck on a stock hull, but my lightweight doesnt have them and no issues there. If you plan on surf riding I would throw a layer or two of 11oz or single 19oz carbon on the bottom just to stiffen it up. The aluminum plates for the mounts is fine, but I dont have a suggestion for what adhesive to use there as I have poersonally not done that step yet. You keeping stock pump and changing thr coupler?

 

[COwakerider]

Yeah for now I am keeping the stock driveline/ pump until I can afford a magnum pump. I got a ada coupler set. I think it will be ok aswell if I grind the ridges, but wanted someones experience. I was going to continue to carbon/glass/kevlar(still in the air) up the side 4-6 inches just to help stiffen things up with out the ridges.. I love carbon, but not sure if I will do carbon as it is to pretty to paint over and a somewhat black engine bay seems to turn to a black hole in no time, if you know what I mean! I am thinking maybe a layer or two of 8.9 oz s glass covered by the red and black 5.5 oz carbon/kevlar hyrid uscomposites offers.

 

[dbrutherford]

I would just got the plate route. If you are worried about the case bolts, you could also make it mount to the Yamaha bed plate mounts.

I think grinding all the ribs out and all that is unnecessary. A plate is a lot more simplier and reversible if you go back to a Kawasaki engine.

 

[COwakerider]

I would just got the plate route. If you are worried about the case bolts, you could also make it mount to the Yamaha bed plate mounts.

I think grinding all the ribs out and all that is unnecessary. A plate is a lot more simplier and reversible if you go back to a Kawasaki engine.

Once you get a taste of the koolaid you don't go back to water!!! The yami bed plate mounts are way off from the plate and there angles are also way off! simple is rarely right!!

 

[dbrutherford]

You just haven't seen what I have seen. The plate I saw modified made it look soooo simple.

I rode some Yamaha's that made me consider this swap. When I get my 800 X2 done, I will do the Yamaha swap in my other X2.

 

[shawn_NJ]

Once you get a taste of the koolaid you don't go back to water!!! The yami bed plate mounts are way off from the plate and there angles are also way off! simple is rarely right!!

I'm with you on this one too.

And what does a new hull cost if you REALLY wanted to go back to a kawi motor? Not alot.

 

[COwakerider]

yeah for real!

 

[WFO Speedracer]

The main thing on the conversion bed plate will be replacing the bolts with studs,that will make it much stronger and I am alos looking into the possibility of relieving the bedplate slightly so nuts can be put on the studs to tighten down against the crankcase,then the bedplate is put on and nuts put on the studs,at that point you would be tightening the nuts against each other and crankcase sealing would be a non issue.

 

[COwakerider]

The main thing on the conversion bed plate will be replacing the bolts with studs,that will make it much stronger and I am alos looking into the possibility of relieving the bedplate slightly so nuts can be put on the studs to tighten down against the crankcase,then the bedplate is put on and nuts put on the studs,at that point you would be tightening the nuts against each other and crankcase sealing would be a non issue.

That is definitly a step in the right direction!! I mean hey, who says one can't have a plate and one be fixed mounts?? Guess I better start poking around for another hull opworm:

 

[x2skier]

The main thing on the conversion bed plate will be replacing the bolts with studs,that will make it much stronger and I am alos looking into the possibility of relieving the bedplate slightly so nuts can be put on the studs to tighten down against the crankcase,then the bedplate is put on and nuts put on the studs,at that point you would be tightening the nuts against each other and crankcase sealing would be a non issue.

I would say using studs is mandatory as it will allow the torsional stress to be relieved, which is good considering the amount of constant torque they will be under by the engine.
The nut to secure the cases separate of the bedplate is a great idea. The trick will be getting enough surface area between the final nut and bed plate to keep it from twisting and coming out of alignment.

 

[WFO Speedracer]

I will have to check with X2 addict and see how much of a spacer he ended up with between the bedplate and the engine,on the Kawi 650-550 conversion bedplates there are some bolts with shaved heads that mount the plate to the engine,you could probably do something similar here and shave some down off the nuts that go on the studs,then the amount you would relieve on the bedplate would be minimal.the key here is going to be getting the holes in the bedplate dead on so there is no wiggle room for twisting to occur.

 

[ADDict]

I'll have to check and let you know what exact spacing I ended up with.
You are right on not wanting to do the bedplate idea. It would be WAY easier, amongst other advantages to glass in 2 3/8" aluminum strips and drill and tap them for the Yamaha mounts.
Example:
I installed a 701 with a lightened flywheel, and a TNT chamber in my X2 this week. Couple passes around th lagoon and the bdplate was loose. Thats a BAD idea, and I only used it as a quick fix for the X2.
BAD BAD BAD. A little glue, a little glass.. TADA.
Don't half ass something when you know the right answer. Your on the right track. My next hull will utlizile the entire Yamaha set up, minus pump. To hell with modified bedplates. I said that in the initial yamaha in the X2 thread, not the way to go, but it will work..
Problem is, miost people who want Yamaha power in the ski, aren't going to be going with some mild 650. If you've got the money to drop $200 on some plate just to get it in there, god only knows how much power your going to put in it. Take the time, do it right.
Once you go Yamaha, theres no going back, so who cares about it being permenant?

 

[WFO Speedracer]

I don't think the bedplate idea will work with bolts period,it has to be studs and there have to be nuts on the studs tightened down against the engine,that way you are sandwiching the bedplate between the two nuts so it cannot move.I think it has potential just all of the i's have to be dotted and all the t's have to be crossed.

 

[COwakerider]

You are right on not wanting to do the bedplate idea. It would be WAY easier, amongst other advantages to glass in 2 3/8" aluminum strips and drill and tap them for the Yamaha mounts.
Example:
I installed a 701 with a lightened flywheel, and a TNT chamber in my X2 this week. Couple passes around th lagoon and the bdplate was loose. Thats a BAD idea, and I only used it as a quick fix for the X2.
BAD BAD BAD. A little glue, a little glass.. TADA.
Don't half ass something when you know the right answer. Your on the right track. My next hull will utlizile the entire Yamaha set up, minus pump. To hell with modified bedplates. I said that in the initial yamaha in the X2 thread, not the way to go, but it will work..
Problem is, miost people who want Yamaha power in the ski, aren't going to be going with some mild 650. If you've got the money to drop $200 on some plate just to get it in there, god only knows how much power your going to put in it. Take the time, do it right.
Once you go Yamaha, theres no going back, so who cares about it being permenant?

cheers!!!:Banane35: so i just placed an order for suplies and it was under 200, and thats with extras to reinforce a sj!!!