I know this is a complex project but I have a 99 m750 carb bike and need to know what issues i would have swapping the motor for a 93 900ss carb (i have complete bike) and can i use my m750 swing arm or do i have to use/easier to use the 900 swingarm
basically i want the dryclutch 6sp 900 motor in my monster
i searched all threads and havent come up with an answer
or if someone can point me in the right direction
I'm pretty sure that is a bolt in swap...swingarm included. The only thing that may be different is the engine mounting bolt size, but I think they're the same. I'm not sure of the year they changed. If they're different the monster bolts would be larger and the 900 cases would need drilling. The only other difference might be the alternator, but that would just mean swapping the regulator also.
You'd have to use the monster swing arm or do a bunch of fabrication on the monster frame to use the SS swinger.
I think the engine bolts are the same. My 99 M900 came with the threaded frame ends on one side you have to drill out to use Nichols bolts. I think those are/were the smaller bolts.
The swingarm sounds good i dont really like the way the 900ss swingarm looks anyway.
So just drill the cases for the swing arm and the motor is a direct swap sounds good.
why is the alternator a issue?
I don't think the alternator will be an issue, IIRC, the monster didn't switch to 3 phase until '00
99.
EDIT: 98. My source of info would be the listing for Nichols Flywheels:
1p Carb'd Flywheel = Pre 1998 Monster 600/750/900, SS, Paso
3p Carb'd Flywheel = 1998 up Monster 600/750/900, SS.
All -ie Monsters and Supersports get a 3p system.
(I only knew this because I had to sort it out when I went to get a flywheel for my '99 M900).
OP, Does your donor Monster frame have an aluminum or steel hooped swingarm?
from your specs above it looks like the 93 900ss is 1p and the 99 m750 is 3p
(i have a complete donor bike 900ss)
so there should be no issue as long as i keep everything on the bike 1p right
the swingarm is steel i would assume the hoop is the same
It definitely is a 1p --> it has a small side alt case, you'll notice it looks different.
I have the aluminum version on my M900 (99) that would bolt right up. This winter I'm planning on tearing the bike down, and putting on a fancy schmancy aftermarket swingarm. Let me know if you'd be interested in upgrading yours to the lightweight version.
how would the 1p affect the swap into the m750 frame
Not going to affect the frame. You'll just need to make sure to bring the rectifier regulator along with it. the electrical system needs to come from the 1p donor bike.
so the motor is a direct swap (meaning the holes will line up) and the swing arm is also a direct swap?
sounds like the only possible issues about fitment are worst case machining cases for swingarm and frame
I don't think it will be an issue. The bolt holes for hanging the motor seem to be identical across the board, only difference is the newer/newest Duc's use a larger diameter bolt (and thus the hole is a wee bit larger).
Similarly, the swingarms mount up at the same location of the motor, use the hardware from the monster to bolt up the monster's swingarm to the supersport's motor.
the engine bolts changed in 2001, yours will be the same.
you'll need 900m headers, the ss ones are different thru the swingarm and the 750 ones don't really fit due to the 900's longer cylinders.
use the 750m swingarm, goes straight on.
the 900m seem to use larger jets than the 900ss if you run open airbox, otherwise they're much the same. i'd probably fit the 900 carbs, as they are slightly different internally between models and capacities aside from the jets which you can swap.
the 3 phase regulator (3 yellow wires) in the 750 will be fine with the single phase alt (2 yellow wires) in the 900. just leave one of the yellow wires from the reg unattached. don't use the flat blade connectors though - they burn out if used with single phase alts. use round "bullet" style and heat shrink them individually.
that's all i can think of. you may need to move the front sprocket in a little - not sure if it will line up with the sprocket on the narrow rear wheel.
You might be able to swap the wheel over. The SS used a 17mm rear swingarm that year I think, dunno about the 99 750, but my 99 900 has the same dia axle. Not sure if there would be any other issues, but since the speedo is off the front wheel, there's not much else.
i see that many of your questions have been answered, but if you have any others, pm me. ive done a couple of these swaps, and i've run into the most frustrating of roadblocks and can tell you all about them. haha. [bang] your swap is fairly simple, compared to some. [thumbsup]
Quote from: brad black on October 20, 2009, 03:28:13 AM
you'll need 900m headers, the ss ones are different thru the swingarm and the 750 ones don't really fit due to the 900's longer cylinders.
just for the rear/vertical cylinder or both
does anybody else know if ill need 900m headers?
I will find out eventually when i go to put it together just trying to gather up everything before i start so there's no hang time
Quote from: bp.leep on October 22, 2009, 02:19:46 PM
just for the rear/vertical cylinder or both
does anybody else know if ill need 900m headers?
I will find out eventually when i go to put it together just trying to gather up everything before i start so there's no hang time
You really don't want to second guess Brad.
He has a wealth of experience and really knows.
do i need the rear/vertical header or both
Quote from: bp.leep on October 22, 2009, 02:28:45 PM
do i need the rear/vertical header or both
Both.
The deck height on the 900 motor is 'higher' enough that the 750 headers won't work.
Both - its like one piece where you can divide it for the vertical header. I've got a set of stock M900 headers I'll sell you, they are just sittin' on a shelf in the garage.
What would I have to do to use the showa adj. rear shock with reservior off of 900ss (piggyback style) on my m750 frame/swingarm with m900 headers? 02-05 swing arm swap
...my m750 has a sachs unit
If you've got a hooped swingarm model, the piggyback reservoir on many shocks won't fit. For example, the Ohlins and Penske shocks available for my M900 (hooped swingarm) use a tethered reservoir that you mount on the frame.
The SS shock mounts from the swingarm brace to a section of frame just behind/above the vertical cylinder.
The 02-05 swingarms don't use the hoop linkage and i'm not sure about the top shock mount.
They Monsters have all got the rocker for the top mount, so the SS shock won't work as it is, and I don't know if you could make it work, or if it would be worth it.
Quote from: bp.leep on October 23, 2009, 09:32:39 AM
What would I have to do to use the showa adj. rear shock with reservior off of 900ss (piggyback style) on my m750 frame/swingarm with m900 headers? 02-05 swing arm swap
...my m750 has a sachs unit
The valving and spring rate for the cantilever shock are all wrong for the linkage system of a monster.
It's possible to change the valve and spring to Monster specs as the length is the same.
If it's worth it is a personal decision.
Thanks for all your input I think all of my questions have been answered. Sounds like easy motor swap ,front end swap, rim swap, new clutch (reason guy sold it), wiring harness (none on bike), m900 headers, new rear shock (any suggestions), fresh paint and powder. Ill post pics of major changes and complete project...
... when im done i get to build a 2nd bike with all of the left overs.....
Thanks
Penske 8983! :-D (I love mine)
Ohlins DU-440
Speaking of which, I've only ever heard good things about the Penske and Ohlins rear shocks.
I think you'd be in a real minority if you picked up a Bitubo or Wilbers or some other. One advantage to the main-line shock absorbers is the amount of vendors you'll find locally to help you rebuild it in the future, etc.
I kind of think of good suspension as an actual investment in the motorcycle, one of the things that holds its value, its not really a wear part. Contrasted with brake rotors, pistons, clutch parts, etc.