Adjustable Cam Gear Swap For Early Fixed 900

[Düb Lüv]

this is what i've collected so far.

DP 2V Ergal rollers 96436603B
Gear holders/Flange 16011051A  Lightened by Fastfrankracing.com
Gear Washer 85610741A
Torx Screws 77950302A

[Raux]

so you need more than just the kit when using the kit?

[Düb Lüv]

so you need more than just the kit when using the kit?

no if you already have factory adjustable gears. but i'm not 100% sure if the DP Ergal gears would fit on the the 01+ 900s since the gear holder/flange has a different part number. the holders i'm using are from a 1100/1000/696/st3.

yes you'll need more than just the gear kit if you have the fixed steel ones.

[Düb Lüv]

it's going to be a little bit before an update. i finally tracked down some ie cams for cheap. thanks to "fastfrank racing" again. i don't want to pull the cams gears twice.

[junior varsity]

cool stuff

[Düb Lüv]

i bought new cam nuts and the larger diameter layshaft washer that goes between the 2 pulleys.

elastic nut part# 70350062A
(2) layshaft washer part# 85610622A . the new washers aren't as thick as the older 900 ones, so i doubled up


the 1000DS cam holders fit the 900 cams and layshaft. the diameter of the DP Ergal pulleys are just a few millimeters bigger in diameter than 900 ones.


here' the 1000DS holders on 900ie cams





told ya i'd be a little bit.

[Düb Lüv]

made new backing plates for the cam pulleys and finally bought the required belts.

the end of the tunnel is close.  [moto]

[junior varsity]

by backing plate, are you describing the giant washer?

[junior varsity]

and by diameter of the pulleys, I believe only the tooth count matters. the 18T is correct for the M900 and really old ass ones had the "square" pulley teeth, which you'd want to change to the round profile ones, like all the current production belts are designed for.

[Düb Lüv]

by backing plate, are you describing the giant washer?

i'm sorry i meant the inner timing belt covers. i made some tiny ones out of aluminum.

also the new pulleys timing mark are in a different location. that's kinda why i made new inner timing pieces so i can mark where the new location is.

also the 20 tooth pulleys won't fit in the 18 tooth housing. i wasn't going to use them anyway.

i'll take some pics to show how i got everything to work. was a little more work than just throwing them on. what would be the fun in that?

[junior varsity]

I know how that goes.

On that project M900 motor/bike - I'm going to use the set of lightweight adjustable VeeTwo cam pulleys I had been saving for the 2vSBK since the 1100 motor will be able to get its own kit at that point I figure. What I learned was the "W" heads did not come with adjustable pulleys at all (and I happened to have a set of 18T lightweight non-adjustable pulleys in case for some reason I did not end up using the VeeTwo pulleys), but the V-heads off the 02 900SSie motor which are going on the bike DID come with the factory adjustable pulleys. Only issue is they weigh more than the VeeTwo's, so unless I find a reason not to use the VeeTwo's, I may have a spare set of factory adj. pulleys available.

What I really wanted, also, was for the layshaft pulleys to also be lightweight on my bikes - but the VeeTwo kits were only the ones for the cams - just a 2-pulley kit - even the 4v kits only came with 4 pulleys.   So I thought I was either out of luck, or would have to order a complete DP or STM (if those are even available still) lightweight adjustable pulley kit - giving me extra cam pulleys.

I originally thought the pulleys were the same as the non-adjustable pulleys in shape/design - and that's why I originally scored some of the lightweight non-adjustable 18T pulleys on the cheap. Wrong. Those 'plates' are affixed to the rollers themselves, and I would wager are fairly important in keeping the belt from walking off the pulley. (The middle "guide" is just like the big ass washer under the pulley on the cams).

Turns out, through some internet sleuthery (here), the DP individual part number for the lightweight "driving" pulleys (the ones on the layshaft) could still be ordered through Ducati - though not inexpensively. So you could order two of part number 96437103B. (pulled the part number from the boxes in the pictures) - about $90 a pop iirc. They look like the bottom left pulleys in the next two pictures:







So that's what I've learned that may contribute to the conversation. Don't know if the other part numbers in those pictures are available to order individually, but that's knowledge dropping I can throw in here.

[Düb Lüv]

I know how that goes.

On that project M900 motor/bike - I'm going to use the set of lightweight adjustable VeeTwo cam pulleys I had been saving for the 2vSBK since the 1100 motor will be able to get its own kit at that point I figure. What I learned was the "W" heads did not come with adjustable pulleys at all (and I happened to have a set of 18T lightweight non-adjustable pulleys in case for some reason I did not end up using the VeeTwo pulleys), but the V-heads off the 02 900SSie motor which are going on the bike DID come with the factory adjustable pulleys. Only issue is they weigh more than the VeeTwo's, so unless I find a reason not to use the VeeTwo's, I may have a spare set of factory adj. pulleys available.

What I really wanted, also, was for the layshaft pulleys to also be lightweight on my bikes - but the VeeTwo kits were only the ones for the cams - just a 2-pulley kit - even the 4v kits only came with 4 pulleys.   So I thought I was either out of luck, or would have to order a complete DP or STM (if those are even available still) lightweight adjustable pulley kit - giving me extra cam pulleys.

I originally thought the pulleys were the same as the non-adjustable pulleys in shape/design - and that's why I originally scored some of the lightweight non-adjustable 18T pulleys on the cheap. Wrong. Those 'plates' are affixed to the rollers themselves, and I would wager are fairly important in keeping the belt from walking off the pulley. (The middle "guide" is just like the big ass washer under the pulley on the cams).

Turns out, through some internet sleuthery (here), the DP individual part number for the lightweight "driving" pulleys (the ones on the layshaft) could still be ordered through Ducati - though not inexpensively. So you could order two of part number 96437103B. (pulled the part number from the boxes in the pictures) - about $90 a pop iirc. They look like the bottom left pulleys in the next two pictures:







So that's what I've learned that may contribute to the conversation. Don't know if the other part numbers in those pictures are available to order individually, but that's knowledge dropping I can throw in here.

those are the pullies that the owner of commoto has and i thought he swapped to the larger 20 tooth belts.


it's going to be a little bit before i get some pics up. i having nightmarish problems with the valvetrain. for some reason the rockers are binding in the middle of opening the valve and won't complete a 360˚ rotation.  i'm not a very happy and patient person right now.

[junior varsity]

you gotta take a deep breath and walk out of the garage! I know how it feels though. A good break from work on the bike and a cleared head will make things easier.

[greenmonster]

Those 'plates' are affixed to the rollers themselves, and I would wager are fairly important in keeping the belt from walking off the pulley.

Never had those plates on my M900 & took them off my 907 rear cyl 3 years ago.
Seems to work fine. I am careful w tension & centering of the belts, though.

[junior varsity]

The ones on the layshaft that are kind of like flanges?  and no troubles? I figure since they are like that on all the OEM layshafts that I have seen, that they were important.