ducatipaso.org

I have been have a bit of trouble getting my local dealer to find the correct replacement for the front sprocket on my 907. He finally came across one today from Sprocket Specialists. It has a model number of 622-15, is actually for a 2001 M900. I have measured it with the stock Ducati part that came off the bike, and the new one is offset towards the gearcase an additional 1 millimeter from the stock. I have looked at a couple of other websites that list replacements for the 907, and they also list the same part number for M900 and 900SS's. Does that seem right?

My questions are, is this the closest that I can get to an original 907 sprocket, and will a 1mm difference in offset make any difference to the safety or wear of the chain? (it's actually slightly under 1mm)

Thanks!
--Mike

I have serched long time another sources for 907 front sprocket, but with no luck... I wanted to put smaler Z=14 to front, but i found only original 15, so i put bigger to rear, using now 45(!!!) :laugh: Very nice ecceleration and front feels very light... :funny:

Have you seached about "sprocket alignement" in the site's search? I can remember something about that in old postings

Yes, I did search the archives, and read the article about sprocket alignment, but it was in reference to the Paso 750. I don't remember seeing anything about how far the sprockets were out of misalignment when it caused problems. I'm thinking less than a millimeter is a pretty small amount of misalignment, as there is probably that amount of play in the countershaft and the retainer plate on the sprocket.

My other alternative, is that I can probably find a machine shop to cut 1mm off one side of the sprocket so that it matches the stock one. (or maybe it's a good excuse to finally buy a lathe. )

Let me know if anyone else has any input on this.

Thanks!
--Mike

I think, U can use that sprocket safely, if only 1 mm diffrence to original sprocket. Do they have only Z = 15 ?

mjfrank,

like ducapaso, I also remembered something being posted on this issue. i went back and searched. i found the following post from finnpaso:

"That was ONLY early 750 Paso problem, NOT 907ie!!! Those 900SS/Monster front sprockets DONT FIT TO 907IE, what needs EXACT 907IE front sprocket !!!! I have played with those soo much, that i know.... Its still available from Ducati dealer(Z=15), but very difficult to find 14 to 907IE. 907IE front sprocket have "0 offset", that chain line is in MIDDLE of sprocket."

He posted that on June 2nd, 2006, in a thread entitled, "Chain Allignment". apparently he's singing a different tune now.

If the allignment is off "significantly", you will destroy your final drive shaft bearing. that's a major hassle. if, on the other hand, the allignment difference is w/in normal operating parameters, nothing will happen. Is the difference significant? Only one way to tell. put it on and see what happens. btw, in that thread last summer, somebody suggested using a shim. i don't know if that's possible. if it were me, i'd let the dealership replace the front sprocket. that way, if the bearing goes, it's on them.

good luck!

elton

Antti owns both the 907 and the 750, so he does know what he tells...
Ciao

persempre907 wrote:Antti owns both the 907 and the 750, so he does know what he tells...
Ciao

Franco,

Antti may "know what he tells," but one thing is certain: His advice to mjfrank yesterday, ("I think, U can use that sprocket safely"), is the exact opposite of what he posted last summer, ("Those 900SS/Monster front sprockets DONT FIT TO 907IE, what needs EXACT 907IE front sprocket !!!!").

Or do you want to argue those two statements are not contradictory?

Elton

The stock sprocket has the code 44910071A and would cost $. 38.
In these things I'm very conservative, so I NEVER change the front sprocket, if there could be any disalignment issue.
It's true, Antti last time told that a front sprocket with a 1 mm. offset could fix (really, I didn't read it), but I wouldn't try.
Ciao.

Hey U philadelpia guy, i think, u are little wrong now.... I have to say some things: When i wrote that "OLD mail, what U mention", I hadnt seens 2001 Monster front sprocket at all !!!!!!!! I talked that time "old Monsters".... Second thing: If only 1mm different in chain line, nothing very bad can happen, if chain is adjusted, like should, cause if its adjusted to right measurements, there is soooo much "space for chain to move sideways", that 1mm is NOTHING in offset !!!!! Think first, how mechanical things work, before You start to "fight against someone".... :laugh: SURELY shimming is very good to do, if cant find just right offset front sprocket and that shimming is very easy to do with shim plates, or with lathe taking material away from spocket side.... I still stay in those words; That "i have played very much with these things", and if there/here is someone, who dont "need" my advices, i let all then go away and go out from this DucatiPaso.org.... I feel, that here is going something "between EU area and usa" ... Anyway i think, that we Finns and Italians, (like Frankie) are much closer to each others, than Europens and people from "land of hope and glory".... :funny: :funny: :funny:

Ps, remember, that in that "old post" i talked mostly of "750 Paso chain line". I have to remind You (if u dont know, like i think.....), that early 750 Pasos had problems with chain line and they use different chain also, but, only in "first batch of bikes from factory". Anyway, 907IE front sprocket have chain line IN MIDDLE OF SPROCKET(!!!!!)= offset +/- 0mm and everything out from that is "bad". Early Monters had different offsets, than 907IE(!!!!). 1mm is "nothing", if thinking line !!!!!!!!

Still one thing: RIGHT chain tight is very important and allways its better to keep them "too loose", than "too tight", cause too tight causes bearing wear in output shaft, what is very difficult to fix. U have to open hole engine and then You can take that bearing away..... I give only advices, not try to make any "war" here.... If someone dont like my attitude, let me know in PM...

Still one thing to u philadelphia guy: SURELY there are many variations of Monster front sprockets depending year modell !!!!!

Well I guess I have some conflicting information, including what the dealer is telling me. (they said as long as the chain doesn't rub the gear case, it's fine. Yeah, right!)

The replacement sprocket (it's a 15 tooth) that I have looks very similar to the stock one, except the shoulder area on each side is ~1mm thicker than stock. This causes the centerline of the sprocket to sit ~1mm closer to the gear case. If this was a dime-a-dozen YamaKawaHondaZuki, I'd probably just slap it on and not worry about it. But since this bike is probably one "no-longer-available" part away from being the center piece of a bar in my basement, I'm not going to chance it.

The back story here is, I replaced the rear sprocket and chain with a 42 tooth unit, and a DID x-ring about 8 years ago. At the time, I used the clip on master link because I was waiting on a new front sprocket. The reason I was replacing it was because from working on my dirt bikes, they would usually recommend changing both sprockets when you get a new chain, and my stock sprocket had about 7,500 miles on it. Well by the time I actually got the sprocket, it was the middle of riding season, and I didn't feel like changing it. Shortly after that, I had a kid, and then another, and as a result, the bike has sat in my basement for the last 6 years without being ridden.

I'm trying to get it back on the road this year, and I thought it was about time I put that sprocket on and riveted the chain. It was then that I found out that the replacement I received 8 years ago was the wrong one. Now I've been going around and around with my dealer to get the right replacement.

So unless I can get someone to machine this down for me, I think I'm just going to take it back, and see if they can still order the stock Ducati part. If all else fails, I guess I can flip the original, and just run that.

Maybe I just need to get a 1098, and retire this thing for good.

Thanks!
--Mike

Thanks Antti, and all who have responded. I appreciate all the info.

Oh, BTW Antti, it's the "Land of milk and honey", not "hope and glory". (Mmmm, honey)
--Mike

mjfrank907 wrote:Well I guess I have some conflicting information, including what the dealer is telling me. (they said as long as the chain doesn't rub the gear case, it's fine. Yeah, right!)

Better You change to such dealer, who knows more about this thing!!! If talking about 907IE(and other Ducatis...): ALLWAYS chain line MUST be in some "limits"(talking now offsets)!!! Its "normal", if U use wide 185 rear tire AND IF your chain is "too loose", then chain start to hit to side of rear tire and make some wearing there, but here is 2 different things: Chain tight AND chain line!!!!! BOTH MUST be in order !!!!!

Btw, WHY U dont go for normal 907IE Z=15 sprocket from Your "dealer"????(bad dealer????) They are still easily found at least from "old world" here from Europe without any problems.....

And if talking about this "land of honey & milk": I can tell (if needeed) from where and WHATKIND of people came to "new world"(land of "hope and glory" , or land of "honey and milk", no matter, what they want to call it.... :funny: Still: U can use safely that sprocket with 1mm difference in offset... Italian tolerances are not so accurate... :laugh:

...and if U have money for 1098, go for it and sell Your 907IE to somebody here in this site(shipping to EU area is too high priced)..... U get much more "better bike", but i am warning You about very high maintain coasts.... :funny: :funny: :funny: