Chain dragging on tire

[koko64]

Ducati specialists here like Speeddog and Brad Black will soon comment on the mixed parts fitment and how to best get the clearance and alignment. So Randy is local (lucky you)? Speeddog did a thread on US engine numbers not that long ago. worth a search.
All I can offer is that the 750 sprocket carrier is definitely more inboard on my 900. So you believe you have a 750 frame, 900 motor and 900 wheel?
Speeddog asked about the swingarm too. Check it with a magnet. There are mix an' match issues to sort out, but you will get a solution soon.

[mastershake]

Actually I'm a little more lucky, Randy is my dad. The swing arm is steel. I checked the engine stamp and it's a 01 900 engine. The VIN on the frame comes up as a 01 750. Here are a few pics of how close the chain is.
http://i1194.photobucket.com/albums/aa367/rooster1986/Mobile%20Uploads/th_IMG_20140509_110102_372.jpg

http://i1194.photobucket.com/albums/aa367/rooster1986/Mobile%20Uploads/th_IMG_20140509_110002_936.jpg

[koko64]

I searched Speedog's thread and you definitely have a 900 injected motor (RA4). That's a good motor (with hotter factory cams than the Carbed 900)! Nice 900 you got there!
I guess it's using the 750 carbs and running gear? I assumed it was a 900 carbed motor.
The 900ie motor uses a different front sprocket to the 750/900. It's a less common fitment and the cause of issues when mismatched.

[mastershake]

The plot thickens, it's a F.I. 900.

[koko64]

Oh it appears you are running the injection. That should go quite well!

So 750 frame, steel 750 swingarm or 900 steel swingarm conversion, 900ie motor and 900 wheel. One pic of the front sprocket will tell the guys here. Depends if you got the front sprocket for the 900ie motor or 750. They will know a combination that works. I'll leave you in their hands.

[mastershake]

Thank you Koko64 for the help!

[koko64]

You're welcome. Sorry I couldn't be more definitive.

Very cool for you (your Dad). Nice to share a passion like bikes.

Looks like a '93 model M900 suspension linkage too. Might be the non S model 900 steel swingarm, but others will have to verify. Although it's a bitsa, that's a good bike with a great motor and frame combo. My brother has a 2001 M900Sie. It's a great bike and the last of the old style hooped frames, but stiffened up with bigger engine bolts and I think larger frame tube diameter or wall thickness (TBC).
Duckstew once shared here how you could feel the difference between the frames when pushing it.

I think it's the pick of the 900 models.

[mastershake]

The guy advertised it as a 2001 900 I.e. and when I ran the VIN to get insurance, it came up as a 01 750!  I just replaced the front sprocket with a 14T, the original was toast. I flipped the front sprocket with the shouldering facing the sump and the chain was pretty well centered between the tire and suspension linkage but the chain wasn't riding the chain guide well. I may flip the sprocket and mod the chain guide or mill out a spacer for the rear sprocket. Waiting to see what the experts have to say.

[Howie]

I'm going by memory, so keep that in mind.  As I said, and Koko64 gives me too much credit, there is a difference in the carriers for the 4.5 and 5.5 wheels, no recollection of what it is.  900 IE and dark had steel swing arms, 900SIE had an aluminum swing arm and adjustable suspension.  750 and 900 swing arm compatible as far as sprocket alignment go?  Dunno.  Your swing arm is steel.   Different part# on the 750 and 900 front sprockets.  Again, except for front sprocket part#s this comes from my less than photographic memory so jump in guys!  Also, Buck Naked may be of some help.  Post your VIN on a 2001 Monster tells you what engine was in it when it came from the factory.  ZDM600 was a 600, ZDM750 was a 750, ZDM900 was a 900. 

Most people replaced the 170 with a 180 over the years, so you probably do have a wrong part somewhere.  I would find the wrong part and replace with the correct part rather than shim.

[mastershake]

So would the 900cc engine I have be from a I.E.? The Monster 750's front sprocket part# is 449.1.003.3A, and the 900 from the 2001 AS had the same part #, but like Loki64 said, the 900 I.E. had a part # 449.1.035.1A. I believe I probably ordered a new front sprocket for the regular 900. I'm also inclined to believe that the rear carrier is probably for the 750. Sloop looks like New front and rear sprockets.

[Howie]

No, 93-99 were carb, but your engine is injected, correct?  Looks so in the photos.  Again, if my memory is correct, the 2000 SIE was unique.  Came with an Ohlins shock and the close ratio 6 speed, requiring flipping the front sprocket, but I don't think that is your problem.  Educated guess; get the 900 carrier and you will be good to go.

[mastershake]

Ok thanks, I will start looking for one. And yes, it is F.I. and I know for sure the 14T front sprocket I bought is for a 900. I talked to the guy I bought the bike from and he said he had no idea that the engine had been swapped. Would I be ok flipping the front sprocket in the mean time?
http://i1194.photobucket.com/albums/aa367/rooster1986/Mobile%20Uploads/th_IMG_20140508_193110_430.jpg

[Speeddog]

OK, I'm a bit late, off doing family stuff.

You've got an '01 M900ie motor.
Steel swingarm, likely the original one, so '01 M750, but no matter as it's the same as the M900 steel swingarm.
And you've got the wide wheel.

If it still has the 750 sprocket carrier, there will be a good bit of clearance between the rear sprocket nuts and the inside of the swingarm.
If it's got the 900 sprocket carrier, the nuts will be *really* close to the swingarm.
So we've got to determine what you've got there.

M900 had different chain guides to work properly with the more outboard rear sprocket.
So you'll need those.
M900 upper chain guide - 447.1.023.1AB Upper chain sliding shoe
lower chain guide - 447.1.025.1AB Lower chain sliding shoe
That should cure the alignment of the chain to the chain guide.

The '00 and '01 M900ie had a unique sprocket, completely symmetrical, not flat one side with hub on the other (like all the others).
Why, I've not been able to figure out.

If you've got the 900 carrier, and the 900 chain guides, it will line up well with the normal (asymmetrical) sprocket mounted flat side out.

I've got a very similar setup of 5.50" wheel and 900 sprocket carrier on a 750 frame, other than an aluminum swingarm and and 750 engine.
The aluminum swingarm and 900 sprocket carrier are from an '00 M900Sie, so the rear sprocket, chain, and guides all line up well.
It aligns better with the asymmetrical sprocket flat side out than it does with the unique symmetrical sprocket.