Front Sprocket Help Please

[The Kevlar Kid]

Can anyone out there help me please -

I'm currently doing a chain and sprocket swap on my 900ie (parts ordered from B&C Express as recommended on here - and very good they are too :cool: ) however the front sprocket that is listed is different to the one that is fitted to my bike (still the original factory fitted sprocket).

The only difference being that the offset on the new sprocket is double that on the old (as shown in the images below). I seem to remember someone else on here having a similar problem, and someone else coming up with the solution as they had had it too - I have searched to try and find that post, but have had no luck.

I seem to remember that the sprocket required was off of an older / newer model - but I'll be buggered if I can remember which.

http://i32.photobucket.com/albums/d25/TheKevlarKid/CSprocket-RHS.jpg

http://i32.photobucket.com/albums/d25/TheKevlarKid/CSprocket-oldnewsbys.jpg

[Scotty]

the retaining plate goes on the other side doesnt it ? so it makes no difference

[Nickj]

As long as it fits the shaft AND the distance from the retainer plate to the same point on the sprocket is the same it'll be OK.
Got to say that from the pics it looks like the sprockets going to be set in a bit more which will work for ohhhh a few turns of the wheel if your lucky!!
I'd call B&C and explain the size difference, they'll have a match if you give them the right info.

[Starter Sprag]

That new sprocket is no good

The centre line of the original sprocket to the retainer plate is very different

Fitting the new sprocket will cause the chain to run out of true

[Zimbo]

I disagree.
The 900 sprocket fits onto the splined shaft and is prevented from slipping off the shaft by means of a retaining plate, fastened to the sprocket by two screws.
The retaining plate sits in a groove on the splined shaft, and this secures the sprocket onto the splined shaft and prevents lateral movement.
Since the 900 is fitted with the boss to the inside and the flat face of the sprocket to the outside, the depth of the boss is not relevant - the flat face and therefore the teeth of the sprocket will sit in the correct plane.
The front sprocket B&C Express have sent you is absolutely fine, no need to be concerned.

[CK & AK]

Zimbo - read again mate - its a 900ie - there has been quite a lot of 900ie probs in the past (ask Pooh or Duncan for example) with these offset front sprockets:)

http://www.ukmonster.co.uk/monster/showthread.php?t=17956&highlight=front+sprocket+900 for example, but it seems the older threads on this are gone.

KK - might be worth dropping Duncan a Pm to ask him to post on here mate :)

[gary tompkins]

The 900ie and possibly some other late ie models had a longer gearbox output shaft fitted, hence the need for the differennt sprocket offset.

The problem is well known about and has led to several fooked chain sets. There was a guy flogging 900ie specific front sprockets on fleabay a while back, but i think these may have been 14T for lower gearing? If your struggling to get the pukka 900ie front cog from a chain & sprocket supplier, you could contact a ducati dealer and order the correct one.

http://www.ducatimonster.org/smf/index.php?topic=80944.msg1063478

http://www.ducatimonster.org/smf/index.php?topic=76879.msg1046695

[steve wright]

i had exactly this problem with B&C. The solution was to
contact "Ducati John" ,he had a batch made up for 900ie and that is where i got mine.
Mind you, i've forgotten how to contact him!
Someone will come along with a link hopefully.
While you're on get the 14T version, it smooths the bike significantly and improves response. It didn't effect my MPG one jot either.

[Zimbo]

Zimbo - read again mate - its a 900ie - there has been quite a lot of 900ie probs in the past (ask Pooh or Duncan for example) with these offset front sprockets:)

http://www.ukmonster.co.uk/monster/showthread.php?t=17956&highlight=front+sprocket+900 for example, but it seems the older threads on this are gone.

KK - might be worth dropping Duncan a Pm to ask him to post on here mate :)

That's interesting, wasn't aware of that. Since I appear to be in the process of aquiring a 900SSie that's useful information. Cheers.

[The Kevlar Kid]

Thanks for all the help and advice chaps - and some useful links there too Gary. Spot on - same problem.

In the interest of keeping a full record of the details on here to help others with the same problem, the new sprocket supplied has one flat face and the other side has a 10mm offset. The original sprocket is the same overall width, but has a 5mm offset on either side.

Looking at the links that Gary and Alan have posted on here it's not an uncommon problem for 2000-01 model year ie's

B&C express e-mailed me today to say they have solved it and a new sprocket is in the post (they have been both helpful & quick - I'd defo' recommend them) - I'll confirm if all is ok and put the details of the new sprocket on here in case anyone else needs it. If not I'll give Duncan a shout as you suggest Alan.#

Again - many thanks one and all. :ukm:

[The Kevlar Kid]

Ooops - nearly forgot to post the solution to this.

OK , for anyone that has this problem, I can confirm that JT Sprockets part number JTF737.15 fits. This is apparently the same sprocket that is fitted to a 90-93 Paso Sports 907 (sometimes reffered to in listings as a 907ie).

Many thanks to Matt at B&C Express for sorting this out.

Some further digging has also revealed that the correct Ducati part no is 'possibly' 449-100-71A although I cannot confirm this (Berto would have been helpful here :D )

Sprocket Specialist also do a replacement part which is apparently number 622-15

Finaly AFAM part number 52607-15 is the correct part number for the Paso Sports, but they list 52612-15 for the Monster. As these are the OE part, this should be spot on.

I'm not sure what the differences are on the AFAM parts as I've not seen them, but it may just be the shape of the boss. Then again, the Paso sprocket seems to have a width difference of about 1mm (not enough to affect chain alignment / within limits) so the AFAM sprockets may account for this hence the different part numbers.

Finaly just a recommendation for B&C Express - I used them because others on here had recommended them and I have to say that the parts were great quality, delivery was fast, price was competitive and they've been a big help in sorting this out. :yoparty: