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851 Corse Replica

Discussion in 'Builds & Projects' started by iambadgerous, Jan 4, 2013.

  1. Hi, thanks for the tip but I've made a conscious decision to steer away from mag wheels because they're prone to cracking, fine for the race track where they tend to be replaced every few races but not for the road (unless you want to go to the trouble of having them x-rayed every now and then!)

    Cheers anyway
    Darren

     

  2. wise move! especially when they are carrying the years...
     
    • Like Like x 1
  3. Nice :upyeah:

    Any info on the rear suspension linkage? (like where I can get one).
     
  4. Hi, they were standard on 1989 bikes and I think 1990 ones too, although I could be wrong. After that the road bikes had the same linkage as the Monster later got (as you probably know the early Monster's rear suspension is exactly the same as the 851/888). I guess this was to lower production costs.

    The race bikes retained the adjustable linkage until the end.

    The linkage is two parts; the rocker and the 'hoop'. On the standard linkage (as fitted to the Monster) the rocker fits 'inside' the hoop whereas on the Corse/adjustable linkage the hoop fits inside the rocker. Take a look at these pictures and you'll see what I mean (the first one is the adjustable)...

    Corse Linkage.jpg Standard Hoop.JPG

    Both types of hoop are adjustable by winding the rose joints in or out of the bottom but the Corse style rocker is also adjustable whereas the road-bike one isn't.

    The adjustable ones do come up for sale occasionally but they tend to be VERY expensive, minimum of a couple of hundred pounds, in fact there's one on eBay in the US at the moment and the seller's asking for £750! This is way over the top but they do sometimes fetch about half that!

    If you can find a rocker but no hoop then a 'standard' hoop can be modified to fit, although you'd lose the other 'Corse' element of the system which is that the rose joints that wind into the bottom of the hoop (the bits that actually bolt to the swingarm) have a 1mm thread pitch whereas the road-bike hoop has a standard 1.5mm thread pitch. This is for finer adjustment as a half-turn of the rose joints would mean a 0.5mm change in ride height with the Corse style rocker instead of 0.75mm with the Monster style one.

    Hope this helps.
    Darren

    Corse Linkage.jpg

    Standard Hoop.JPG
     
  5. Thanks for the info, I'm liking the linkage and will keep an eye out for reasonably priced one for my Monster.

    Would go well with the 851 braced swingarm;

    [​IMG]
     
  6. Interesting swingarm, although I don't think it was originally destined for an 851....

    To my knowledge there were only two braced swingarms during 851 production, the first one was as fitted to the 851 'Kit' which was a low volume customer race-bike from 1988. As you can see from the picture below the chain adjusters were completely different from the later 851/888/Monster...

    Kit Swingarm.jpg

    The next one was for the early factory race-bikes like Raymond Roche's championship winning bike from 1990. This picture shows that (although it had the later chain adjusters) the overall shape of the swingarm is still different from the later 851/888/Monster style and the bracing is a lot shallower than on yours...

    Ducati-161bb.jpg

    Another thing is that your swingarm has the hole in the side to allow access to the bottom shock mount, this wasn't added until about 1991. My bike doesn't have it which makes removing the bottom shock bolt an absolute mission...

    Braced Swingarm.jpg

    I think yours may be a later Monster swingarm that's been modified although I have been told that a braced swingarm for the Monster was available as a 'Ducati Performance' part through dealers. I've never seen one of these so maybe yours is the first...?

    Where did you get it? It looks in good nick so was it new when it came to you?

    Cheers
    Darren

    Kit Swingarm.jpg

    Ducati-161bb.jpg

    Braced Swingarm.jpg
     
  7. Well everyday is a School day here :upyeah: I thought it was from an 851 as I understood only the 851 had the option? but the breaker I bought it from said it had come off a Monster so maybe it is a Ducati Performance Monster arm.

    As far as I can see it is original i.e. not a modified arm, it did have the 851/888 style hugger fitting brackets when I got it but I cut those off and fitted thread inserts to use my Monster hugger.

    It wasn't new and did have some chain 'bites' and few scrapes in it that I repaired. I do need to decide what finish to go for before building the bike though - bike is still very much in 'project' stage at the moment.
     
  8. Hi, yeah the earlier Monster swingarms used the same method of mounting the hugger as the 851/888 but it was changed at some point from the 'tabs' that stick up from the swingarm to rivnuts. Not sure when, I'm no Monster expert!

    Where can I see more about your bike? It looks like a cool project...

    Cheers
    Darren
     
  9. just an added bit of info
    the chain adjusters on the 851 kit are 88 - 89 900 supersport parts
    Steve B
     
  10. Was meaning to do a project thread here but after starting two (one at Ducatisti & one at UKMOC) never got round to doing it. You can see the UKMOC thread here; Dukedesmo's M900 project - the intro... - UK Monster Owners Club Forum

    It's at a bit of a standstill at the moment as I'm working on the 916 but hope to get back on it in the next couple of weeks. :upyeah:
     
  11. Brilliant build - would you do anything different next time?
     
  12. Hi, if I thought about it I'd probably never have started! Thanks for the compliment...
     
  13. Hi All

    I finally found the time to re-do the front end on my bike. I got hold of a set of Ohlins FG9051s (very similar to the FG9050s fitted to the 851 and 888 SP models) and some nice Brembo billet calipers and they've been sat in the garage waiting for me to get my finger out since well before Christmas!

    When I built the bike last year it had pretty much a complete 916 front end apart from the yokes, which were 900SS/851/888 with the top one machined out and the bottom one shimmed down to 53mm.

    The Ohlins forks are 51mm top and 53 bottom, so I had another top yoke machined out (the standard 851 is 50mm) and used the existing shims in the bottom.

    I could have used a standard front wheel, but I wanted to retain the 916 style wheel because it looks more like the Marchesini mags fitted to the Corse bikes but this posed a problem; the forks take a 20mm axle but the wheel has 25mm bearings. The answer was to get a sleeve and spacer machined up to sleeve the axle up to 25mm and to space the wheel away from the right-hand fork. Steve B (duc904red) sorted me out*, thanks Steve!

    DSC08578.jpg DSC08579.jpg

    The old yokes and forks have ended up on my new Darmah project...

    One of the reasons for the delay in fitting the new forks was my hunt for a set of genuine Ducati bars. Standard SP bars were fairly easy to find but I couldn't lay my hands on a set of Corse bars which are different. In the end I gave up and bought a set of generic trackday bars but literally the day they turned up a pair of NOS Corse bars turned up on eBay :rolleyes:. Naturally I snapped them up.

    With that little lot sorted I fitted the Brembo billet calipers and fully floating cast iron discs (which I need to give a damned good clean!) that I had stashed. Finishing touch is the repro mudguard from QB Carbon.

    DSC08584.jpg DSC08585.jpg DSC08586.jpg

    Next job will either be fitting the 996 engine or doing a 'big axle' conversion on the rear, upgrading the rear caliper at the same time.

    Further down the line I'm going to re-do the wiring. I wanted to fit a P8 CPU (just to make it look 'right') but that would involve some changes to the engine, so instead I'm going to put a 16M board inside a P8 box.

    That's all for now, cheers
    Darren

    *Due to my inability to measure anything correctly the first time, the spacer that Steve B made for my was too small (NOT Steve's fault!) and because I needed to get it sorted quickly I got a local machine shop to make a bigger one for me, Sorry Steve!

    DSC08578.jpg

    DSC08579.jpg

    DSC08584.jpg

    DSC08585.jpg

    DSC08586.jpg
     
    • Like Like x 1
  14. Absolutley spot on ,well done indeed. Is that a HRC overfill bottle I spy there. I have one of those ,(not yet fitted ) .
    Pete.
     
  15. Thanks for the compliment, yes it's an HRC item, a recommendation from Mr R, works great!
     
  16. Looking great!
     
  17. ...and here she is with her bodywork on...

    DSC08679.jpg

    DSC08679.jpg
     
    • Like Like x 4
  18. An absolute work of art !!!!! what a stunning machine, great work :upyeah:
     
  19. I met you at Bristol :)
    Got a pic of your bike with bins
    Will post it for you
     
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