1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

1989 900 Supersport In France.

Discussion in 'Supersport (1974-2007)' started by Guillaume69, Mar 31, 2023.

  1. In the meantime, I started putting things back together, where it won’t interfere with exhaust valves access.

    Cleaned high voltage coils. 73874607-C9C3-4467-8A3C-73C17383EFA6.jpeg

    Brand new MOSFET r/r: 4D7BD670-2EE2-4E9A-8FD1-85968AEB9E05.jpeg

    Cleaned horn (1st pic is before):
    049A3553-19F4-46CE-B1BC-0B346C847E44.jpeg CDE68C60-35CE-49B8-AC39-07AC26B306F9.jpeg

    And last but not least, new chain and sprockets: C8B37CF9-9D37-4F3F-840A-A7DDB69A06C4.jpeg 1C5B9C50-15EF-49A9-AE2F-CC05F42B27F3.jpeg C0BD5B3E-4F37-4DAE-A247-3A7C9FBCDFB5.jpeg ECE4FFF5-846F-4474-B639-F8E90D0F9916.jpeg

    Looking much better than a couple weeks ago ! 3FAC6D53-AC90-40D2-908D-D5E6110D7650.jpeg
     
    • Like Like x 6
    • Agree Agree x 1
  2. Big day today!
    I was able to get the valves done and finally opted for a little bit more lash for the exhaust openers, taking heat and valve seats into account. When I buttoned the engine up, my final measurements were as follow (same on both cylinders, believe it or not…):
    - Intake :0.11/0.04
    - Exhaust : 0.15/0.04
    Put new belts on, new oil + filter + pre-filter (mesh), carby back on after a good cleaning and refurb, new plugs, new battery, tidied the wiring harness, put the front end back together (front wheel and brakes to follow) and waiting for the shock to come back from reconditioning to finish up the rear. B457D5C1-DB6B-44E1-8CAF-69C584D3EF25.jpeg C59C4D2A-F293-42C8-BF5B-7610ADE938F2.jpeg FE0DF864-7018-4DB9-90FF-D6AD28268F72.jpeg

    And my little before/after impression :
    433BE1A2-EA93-4493-8CC5-15D777C8A7B6.jpeg 10BAA215-6C26-402B-B97E-3479A233916B.jpeg

    Next will be testing everything electrical, slap the tank on and see if it wants to start!
     
    • Like Like x 6
  3. Of course it wants to start, it's a Ducati.:p
     
    • Funny Funny x 2
    • Agree Agree x 1
  4. I keep my fingers crossed you know. As a non pro DIY Sunday mechanic, I always find it a bit stressful the first time I hit the starter button after messing with the valve train… :rolleyes:o_O:D
     
    • Like Like x 4
    • Agree Agree x 2
  5. You could do what I do for the first moments...close your eyes! ;)
     
    • Funny Funny x 2
  6. It cranks!! :D

    Plugged everything electrical yesterday and briefly pressed the start button just to see if the starter would turn. Well, with new upgraded cables and LiPoFe4 battery, that thing does want to start with a passion! It’s begging for fuel now.

    Still a few things amiss:
    - Neutral switch light
    - Horn
    - Kill switch (still run on off…)
    - Side stand switch light. 3B1F3295-DF30-4B33-BB40-5FA1E6521B4D.jpeg

    About the latter, well, unscrewing it from the stand without unplugging the connector from the loom leads to this…
    311E8277-A254-4E30-BA3A-AB776A766E94.jpeg

    Nothing a little soldering couldn’t fix, though. 88A81071-2B5D-4A46-9343-23652DCB9F61.jpeg

    Note: Everything works fine on the donor.:upyeah::D 72F0AEE1-FBFA-4A27-B180-285CD7486311.jpeg
     
    #46 Guillaume69, May 24, 2023
    Last edited: May 24, 2023
    • Like Like x 2
  7. Now about the the clutch.

    This is something I tackled a couple weeks ago. These still have what I believe is called an inverted clutch: the slave is on the right hand side, built in the clutch cover, with the piston right in the middle, pushing the pressure plate inward (as opposed to the more recent system with the slave on the left and a clutch rod pushing the plate outwards). 4BCC551A-4C96-4C45-AFE4-AEACDC79E39A.jpeg
    It is simpler, conceptually, but has a few downsides. First, the cover is a bear to bleed. Second, when not used for a while, the piston tends to seize in the middle of the cover. And those covers are pretty hard to find if it needs to be replaced. Pistons can still be found new but cost a fortune. Having two bikes, I decided to overhaul both clutches at the same time to see exactly where I was starting from and get what cosmetically looks the best on the chosen bike.

    Chosen bike:
    - Closed OEM cover.
    - Clutch internals (basket, drum, discs) looking pretty good.
    - Piston looking nice and not seized.
    - Left side (oil pump) cover flaking.
    8CCE9406-C758-4189-8686-0AB61ADED87D.jpeg B70292FA-712A-4F2D-A948-E863EC7FCCA3.jpeg

    Donor bike:
    - Machined OEM cover (pretty well done if you ask me).
    - Clutch internals (basket, drum, discs) looking dirty/rusty. Bike must have been stored outside exposed to wet weather. Basket and drum in good shape, though, but discs shot.
    - Piston seized, obviously…:rolleyes:
    - Left side (oil pump) cover looking much better. 85AC21B3-946C-4936-BF8A-E704E32E63DD.jpeg

    Here are some side by side comparisons: 8A00D112-95A5-4D08-A91B-2F7A53AD45BD.jpeg FE0A4609-56EB-4A75-955C-2AECEB188F06.jpeg F9DE738F-0289-4E07-B1C6-A1E18D16F379.jpeg 9B4769D3-5498-409A-A0BE-7E4EB7CA4015.jpeg

    At this point, I decided the following :
    1/ Chosen bike gets the machined cover with new piston (that’s how I know they are expensive…), new discs and gets the donor oil pump cover.

    2/ Donor bike gets closed cover, chosen bike discs and flaking oil pump cover.

    And both get the house elbow grease based grand overhaul treatment.:D E8C5F718-8A1C-41C5-B5A2-CC2C285778AB.jpeg EBAE865E-AEB5-479D-8633-6D56F0FB44DA.jpeg BF6B9A3E-1206-4D6B-8BCC-59D31B93003A.jpeg 6491073F-E2EA-4408-AB53-E8A62308253C.jpeg

    And here’s the final result.
    Donor bike:
    886DE9C9-8B6E-40FC-AC83-0789291D87E2.jpeg
    Chosen bike:
    96AEEA85-FD4E-4EBF-B784-2CFBA270ACBB.jpeg
     
    #47 Guillaume69, May 24, 2023
    Last edited: May 26, 2023
    • Like Like x 1
    • Useful Useful x 1
  8. Now, a few words about the seized piston. I initially thought it would nicely pop out using compressed air, like brake caliper pistons. It perfectly worked on the closed cover, but not at all on the open cover. Seized!
    I had to put it back on the bike and refill/bleed the hydraulic to get it out very slowly using the clutch lever. That took a fair amount of time… Ugly and dirty!
    E704CAF5-25F0-4779-A267-2B4831A97F4F.jpeg A55FACDB-0E1C-44FD-A151-6A8E3D1BD5D2.jpeg 1E26C307-B2A9-465F-8937-2C8150B02BF2.jpeg 49A9E6B5-4879-4437-9DB6-AAEB74F50EE4.jpeg

    Here comes a new piston! They come un-assembled so you have to do it yourself. Nothing complicated. Just small. And don’t lose a ball as they are not held together.
    7F02DDD0-17C9-4083-A436-CB32578318BA.jpeg 6F01885A-556E-432B-9B67-4B01F3415F69.jpeg 4ECDFD79-3269-48E7-A4D7-9DFD5635EFFE.jpeg 8FAE49AA-D0C8-4CC8-96AB-E6794F9E23CF.jpeg

    I read on the Paso forum that you can polish the cylinder with Autosol. It does works really well.
    116E03B4-EAC9-452E-A26B-546237394732.jpeg
    C741DD37-BA1D-40CB-A345-E884DC75B28E.jpeg

    With all this done, I expect both bikes to have a well functioning clutch. We’ll see soon enough.
     
    • Like Like x 5
    • Useful Useful x 1
  9. More progress! Just missing the low fuel and charging lights. These will come later. 3570D93A-617A-4FA4-AE2D-950A74ED95B6.jpeg
     
    • Like Like x 3
  10. Getting there. Fuel pump priming too. 588E25FB-71AA-4D2C-B467-6AE03D90E605.jpeg
     
    • Like Like x 3
  11. I decided to try these. I think I like them. :)
    3E419F67-B351-4784-BCCE-0263AC197796.jpeg 9E330DEB-995A-4D18-BA57-D7D8404D51CC.jpeg
     
    • Like Like x 1
  12. Putting the front back together. Another « before/after ».
    4986267B-45B1-476D-9A93-4A2D9995C080.jpeg 8BED0970-78AC-4AB3-B9FC-1A8AFE416164.jpeg
     
    • Like Like x 5
  13. Well, unfortunately, those blue/red DP brake hoses advertised as « 900SS until 1990 » are not fitting well in the front repartitor. I can’t get rid of a little drip on the right hand side. With a production date in 2005, I think these are probably suited for later SSie models… 8FDFC24A-FBA5-4FC6-9532-D1A03878A412.jpeg A35490D4-2EF3-4301-BB44-6464501E2991.jpeg

    I reverted back to the OEM hoses which are in perfect condition and no leak. Refill, bleed, and I have good brakes upfront. And good news, the rear break light pressure switch is working, so good light too. You will notice that the main switch (center of repartitor) has been replaced by a more recent side switch. As it perfectly works with no leaks, I decided to not mess up with it this time round. 1364BDEB-6E36-4229-B707-8E278F69EF93.jpeg 95C38CC1-C925-44B5-B3A6-9A624F962497.jpeg F8544DAA-906E-4CEE-A707-E897A98E2163.jpeg

    I also checked the front/nose fairing for clearance with the bracelets, and we’re all good there too. 357789DE-1F04-4A17-8F34-2D46FBC83F01.jpeg

    Don’t you think it vaguely looks like a grouper fish? :thinkingface::D 8D80A7EC-9AF6-46A6-AED1-CC6C9ACAB038.jpeg
     
    • Like Like x 1
  14. One more step towards starting her up: the exhaust. Very happy with how that turned out. :)

    69A68BAA-566F-476F-960F-B996B6A27425.jpeg F9DCDF5D-89EB-4465-81A6-A2CDB0DFFE0D.jpeg A9A48ED2-BB5F-460B-840B-F04FBD3C4ACB.jpeg 002AF60D-4656-4A6D-B8E2-EB4890D17A32.jpeg 372C76D0-E2F6-4570-9839-944EE23200C4.jpeg 88B335A3-15A0-42A5-90A1-F69CEAAADCD3.jpeg

    120707E5-DD2C-4632-8293-7FB06D2B41EC.jpeg
     
    • Like Like x 3
  15. It has started!!! First try, boom, she fired right up, and idles like a queen.

    God I am happy tonight! :D

     
    #55 Guillaume69, Jun 2, 2023
    Last edited: Jul 2, 2023
    • Like Like x 6
  16. Properly tuning the carb is next on my agenda. I started reading some about it. Here’s my favorite find so far:

    « It may seem like a lot but really it is not. Being careful and methodical in setting up the carbs may not be glamorous but it is where the magic really is. Proper preparation and understanding of simple individual tasks is what will make you look like a factory trained carb tuning rock star. »

    A factory trained carb tuning rock star... I love the sound of it. :D
     
    • Like Like x 2
    • Funny Funny x 2
  17. Grow your hair and get yourself a 747 as a daily runaround and your halfway there.....

    Good luck with that, but looking what your all about, i don't think you'll need it.:)
     
    • Funny Funny x 1
  18. There is a 747 that fits the bill
    upload_2023-6-3_9-9-10.jpeg
     
    • Like Like x 1
  19. 5DC8908F-DE22-4841-A6DE-25958C592583.jpeg
     
    • Funny Funny x 1
  20. ......and we think we've expensive hobbies with these Ducati's.:eek:
    maxresdefault.jpg
     
Do Not Sell My Personal Information