Featured 851 - 1993 Strada Biposta (in Bits) Restoration

Discussion in '851 / 888' started by gaz92, Jul 25, 2024.

  1. Do you have a link for the puller please?

    Cheers.
     
  2. Presume you mean the ebay replica. This is the item number for a 900ss one but think they could all be the same. 125558653209.
    Had some tools from this guy when I started the 900ss reno I thought they were decent quality.

    The 2 leg puller I got was a used kukko one never heard of them before but looked them up and they look good quality.

    Cheers Gaz
     
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  3. Yeah, I meant the 2 legged one...I also don't really want to 150 smackers for a rarely used tool! Thanks.
     
  4. Sorry a new kukko puller is similar money, I don't think the seller knew what he had, £30.
    There are some that look similar and are cheap on ebay but think they are the usual imported rubbish, but they may work.

    Cheers Gaz
     
    #44 gaz92, Oct 20, 2024
    Last edited: Oct 21, 2024
  5. Didn't think I would use this engine support again but here it is, it was a big help putting the gears in and the casings back together on the 900ss.
    20241020_202924.jpg

    Found this switch amongst the parts, can anyone tell me what it is, and does it belong on a 851.

    20241019_164024.jpg

    Cheers Gaz
     
  6. It doesn't belong on an 851. Possibly off a later Ducati. Looks like a start/kill switch. Your 851 will have the same kill switch as your supersport.
     
    • Thanks Thanks x 1
  7. Yes thought so thanks for confirming.

    Cheers Gaz
     
  8. Looks the same as what is on my monster
     
  9. Thanks M nine, will put it to one side, at least that saves me from trying to fit it somewhere.

    Cheers Gaz
     
  10. It's also on the ssie models.
     
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  11. I hvaen't found any problems splitting the cases that have been threebond sealed. I have found iy an absolute b8gger to remove.
     
  12. I split them no drama with the help of patented casing splitter. Insert into cylinder bores and squeeze.

    20241022_172743.jpg

    20241022_173654.jpg

    Cheers Gaz
     
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  13. A bit of progress. I was looking for an output / final drive shaft, saw a few with some other internals going for £150 ish, managed to pick same up for £45. It's the same as my 900ss and also discovered same as many 900 monster which this was from.

    20241114_114419.jpg

    It had some slight marks from the spline but I also picked up a new sprocket and it was a much better fit.

    20241114_114549.jpg

    Slight head scratcher, the diagram showed 2 washer item 6 in the middle but there was only 1, and on the new shaft it had a bigger o.d.

    20241114_115832.jpg
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    So it when back together with just the bigger washer.

    20241114_121936.jpg

    Oh bearing ends are different, watch out and snap rings are a bit tricky.

    20241114_114059.jpg

    20241114_114624.jpg

    Cheers Gaz
     
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  14. Liking your working method.
    I wonder if there is a cross reference resource of what is interchangeable?
     
  15. Interesting - I've never seen split needle-roller bearings before (in ~45yrs of engineering experience). Useful.
     
    • Agree Agree x 1
  16. If you go on to www.bike-parts-ducati.com and search on the original part number it brings up a cross ref of all the bikes it is used on.

    Cheers Gaz
     
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  17. Cleaned up shaft end a bit and new talon sprocket for a £10 er.
    20241115_105539.jpg
    Took everything out of casing and put in unshimmed crank. There was a 0.5 and a 0.2 on each side, 1.4 total. Bolted casings back up and got 1.25 /1.23 end float. So pre load is about right at 0.15/0.17. It felt a bit tighter than my SS but they were reused bearings.
    20241115_211452.jpg
    What is this seal brand like, Key brand or possibly New Key. It was new but thought it looked a bit cheap so pulled it out
    20241115_144713.jpg
    Oh, casings had 3 bond, I think I am going the gasket route as 900ss.

    Cheers Gaz
     
    #57 gaz92, Nov 15, 2024 at 10:15 PM
    Last edited: Nov 16, 2024 at 10:23 AM
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  18. Just some figures for planned preload end float. I used these in the 900ss reno, any comments appreciated.
    Screenshot_20241117-180726_Gallery.jpg

    It's been at the back of my mind for a bit but I haven't been conviced the swing arm bearings and seals have been changed. The grease looked a bit old, and in the internal pocket the casing has not been aqua blasted, which suggests to me the bearings were blanked off for cleaning.
    Anyway, I can't put the casings back together without changing them. l am glad really because it made me think of a different approach.
    By far the worst job on the 900ss reno was getting these bearings out. I made a few picks to try and hook the clip ends out, but it did not really work. I then thought modify the casing, I don't really like doing things like this but thought in this case it was justified. I made a half round slot in the thicker part of the casing to intercept the clip groove. By doing this I was able to get a pick round the back of the clip and bend it in. Then put in a bigger screwdriver and collapsed the clip in moving it around as I went. Try and keep it bent on the same plane so you don't damage the groove rather than bending it up.
    20241117_180208.jpg


    20241117_160546.jpg

    20241117_175101.jpg
    20241117_174127.jpg
    Mechanically I can't see it affecting the performance of the clip, and it makes changing the bearings a lot easier.

    Thinking about it after I remember seeing something like this on the piston gudgeon pin clip, it must have been subconsciously lurking.

    Cheers Gaz.

    20241117_175101.jpg

    20241117_174138.jpg

    20241117_160546.jpg
     
    #58 gaz92, Nov 17, 2024 at 6:51 PM
    Last edited: Nov 17, 2024 at 10:35 PM
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