Hi all! Got a problem I honestly can't fix. My 01 Monster 750's chain is eating the tire. I have small gouges all along the side of the tire. Just sitting, the distance between the tire and chain is maybe at most the thickness of two nickels or less and the chain easily pushes up against the tire. The tire is a Dunlop 170.
I have replaced the front sprocket and chain. The axle measures the same difference on either side and I have one inch of slack on the chain. Looking from the rear down the length of the chain, it looks to be perfectly straight from rear sprocket to front. I've had the bike since February but only started doing this about a month ago.
I honestly am at a loss for what could be causing this. So please, any advice is welcome.
Could it be loose adjusters perhaps when the chain is under power it torques the rear axle causing deflection? I would pull of the rear wheel, check bearing and alignment. It may appear aligned but under power it is drifting.
A few things to check as a routine.
You may have these covered.
The adjuster plates cant be trusted. It may still be out of alignment.
Get the front sprocket cover off and inspect it carefully. Is it a retainer type or big nut holding it on? It may have walked across if the retainer plate failed.
Double check for the correct parts/sized parts for your model.
Maybe the sprocket is on the wrong way if it has a shoulder?
Check the rear sprocket/ sprocket nuts, just in case.
Check what zipps said and axel torque.
Some tyres are wider than others irrespective of the numbers. Dunlop make some wide tyres like Q2s. Q2 170=180 of some other brands for example.
I used a tape measure and measured from the front of the swing arm to the center of the axle on both sides. The sprocket uses a retaining clip, I'm wondering of the sprocket is installed backwards, I see pictures of them both ways. I've checked the rear sprocket, it has zero movement. When I installed the new chain today I torched the axle nuts to 55ft-lb and the tension bolts to 8ft-lb. I guess tomorrow after work I'll pull the rear end all apart.
The trouble started about a month ago when I took the original front sprocket off to fit a 14T sprocket on. But it ended up being the wrong pitch and I put the original back on. I was looking at Ducati of Omahas parts diagrams and it shows the sprocket facing opposite of how I have mine, it also shows some type of shim behind the sprocket that I don't have.
Your front sprocket should have the hub outboard, flat side towards the engine.
Confirm that the retainer plate hasn't worn through, allowing the sprocket to move inboard.
Some models have issues with that.
'01 M750 should have a 160/60 rear tire on a 4.50" rim.
Confirm that the cone shaped spacer on the left side of the rear axle is still there, and is installed flat side out.
Take some pictures and post 'em up.
Here's how: http://www.ducatimonsterforum.org/index.php?topic=109.0 (http://www.ducatimonsterforum.org/index.php?topic=109.0)
If everything Speeddog says to check is OK ( you might also use a straight edge or lazer to check sprocket alignment too) and you have a 4.5 inch wheel replace that 170 with a 160. 160 is the correct size for a 4.5 anyway. If you have a 5'' wheel...ummm...trying to remember, maybe wrong sprocket carrier.
Thank you all for the suggestions. I will dig into it today after work and give you all a update.
I had the same problem and it was the retainer clip, as mentioned by others. If you need a new one, grab a few because they are not that expensive.
Well to show my ignorance, I measured my rim and came up with 6inches. I measured from the inside not measuring the lip that extends up. It may not make a difference but the frame is a 2001 M750 and the engine is a 900, the owner before me did that and I had no clue till I ran the VIN. He advertised it as a 900 I.e.
Look at all the spokes on the rear wheel, one should have lettering like 17x4.50 or 17x5.50 or the like.
What does it say?
Swingarm aluminum or steel?
Bottom left side of the engine has the engine number, first 4 digits are?
It is a 17x5.50 rim and the first four are RA41.
What exactly does RA41 signify?
Is it possible that after I tried changing my front sprocket, I smashed something in the rear carrier? If I measured correctly, there is a 1/16th difference between the front of the sprocket and rear of the sprocket.
Quote from: howie on May 08, 2014, 11:32:17 PM
If everything Speeddog says to check is OK ( you might also use a straight edge or lazer to check sprocket alignment too) maybe wrong sprocket carrier.
The 750 sprocket carrier on the 900 wheel will have the chain too close to the tyre. I found that out once. There's maybe 10mm difference iirc. Speeddog or Howie will remember. Any part no. on the cush drive/sprocket carrier?
The sprocket has Z1G00 stamped on it. I'll go to Strada fab tomorrow and pull it all apart. So the sprocket on the 750's sit closer inboard than the 900? If that's the case, could I shim the sprocket to sit more outboard?
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.
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_110102_372.jpg)
http://i1194.photobucket.com/albums/aa367/rooster1986/Mobile%20Uploads/th_IMG_20140509_110002_936.jpg (http://i1194.photobucket.com/albums/aa367/rooster1986/Mobile%20Uploads/th_IMG_20140509_110002_936.jpg)
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.
The plot thickens, it's a F.I. 900.
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.
Thank you Koko64 for the help!
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). ;D
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. [thumbsup]
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.
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.
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.
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.
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 (http://i1194.photobucket.com/albums/aa367/rooster1986/Mobile%20Uploads/th_IMG_20140508_193110_430.jpg)
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.