790 Reported Clutch failures - My 12k mile examination

Discussion in 'Parallel World (790/890)' started by windblown101, Nov 10, 2019.

  1. roookie1

    roookie1 Been here awhile

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    If the jet was a problem i think it had occurred already with the 790 Duke...It was not a problem on the old 950/990 either..
    1coolbanana and No-Fret like this.
  2. Velociraptor

    Velociraptor TrackBum Super Supporter

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    I am running the TorqDrive clutch pack and it is a quality product. Only downside is now it is harder to find neutral. I emailed them and got a quick response that their clutch pack has a bit more drag and also might need to wear in more. Simple install. My stock clutch looked fine, but this one will probably last way longer and endure a lot more abuse.
  3. nibby

    nibby Been here awhile

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    Has anyone put in heavier springs on the stock yet?
  4. TrailTrauma

    TrailTrauma Nemophilist

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    I suspect @Camel ADV has, and perhaps @AdvRonski . I'll be ordering mine well before this season begins. Still working on losing a few lbs.
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  5. ramirin

    ramirin Ready to push

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    Do we already have a part number for heavier springs?
  6. Kinkysmurf

    Kinkysmurf Adventurer

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    No, not that Im aware of, and maybe TT is talking Rear Shock springs since he is talking about losing weight.

    If the snippets of rumor about Birch using heavier clutch springs is right, " he got them from his toolbox" Id start looking at 1090 springs or others in the KTM line up that match O/D and free length if you feel the need for them.
    Im ok with stock unless I feel it slip. The Old Husky in my Avatar needed Heavy springs 6x, Husky made them available since to stockers would sag out fast.
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  7. AdvRonski

    AdvRonski They call me......Ronski

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    I looked at 1290 clutch springs, as they are basically the same length as the 790 springs, but they are also 2mm larger in diameter, and do not fit in the 790 clutch. Maybe someone from a dealership can measure the 1090 springs. They are several mm longer than the 790, but if the diameter is right, that would provide a little more clamping pressure.
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  8. TrailTrauma

    TrailTrauma Nemophilist

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    Opps, my bad. I was speaking of rear coils. :fpalm
  9. AdvRonski

    AdvRonski They call me......Ronski

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    Finally made it to Fruita!
    Well, now I'm confused. But, I went with a stiffer progressive spring at the rear.
  10. TrailTrauma

    TrailTrauma Nemophilist

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    Last time the heavier clutch springs came up I considered emailed Birch. I'll do that tonight, and report back .. hopefully he recalls something specific about the springs 'he had in his toolbox'. lol

    Edit: I emailed Monica, his wife, in the hopes she'll pass along the heavier clutch spring query to Chris and get back to me.
    AdvRonski likes this.
  11. Camel ADV

    Camel ADV Long timer Supporter

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    I'm running the stock springs but a 0.5mm oil jet.
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  12. ramirin

    ramirin Ready to push

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    Assuming this is about clutch (not shock); what is size of oem jet?

    Just to be sure, do you have auto-clutch (radiusx) or just exchanged clutch pack (torqdrive) ?
    gsuks likes this.
  13. gsuks

    gsuks Long timer

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    part number 5


    790 adv clutch.PNG
  14. gsuks

    gsuks Long timer

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    wel it's finally possible to see the 890 duke in the ktm parts finder, I looked to see if there were any different part numbers on the pages for clutch and the transmission I main shaft,
    no difference in part numbers
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  15. Velociraptor

    Velociraptor TrackBum Super Supporter

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    Just the Torq drive clutch pack. No auto clutch.
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  16. ramirin

    ramirin Ready to push

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    0,3mm that is one small hole for important feature.

    @Camel ADV did you drill it or do you have part number for 0,5mm jet?
  17. Camel ADV

    Camel ADV Long timer Supporter

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    I drilled it. It was a bitch to find a bit that small and as annoying to find a drill with a chuck/collet small enough to grab the bit. If you do drill it, I'd suggest ordering a spare oil jet from KTM first. With a drill bit that small, snapping it off is quite possible and you'd have a hell of a time getting it out after.
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  18. ramirin

    ramirin Ready to push

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    I would probably send to or visit a company that has the tools and expertize - shouldn't cost more than a special drillbit :dunno
  19. 1coolbanana

    1coolbanana Long timer

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    0.3 to 0.5 is close to 3X the surface area and flow rate.
    0.3 = 0.07 mm² , 0.5mm = 0.2 mm²
    Thats the same size I always used on 9XX's

    This is what I use

    [​IMG]
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  20. 1coolbanana

    1coolbanana Long timer

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    I drill by hand when enlarging a hole under 1mm.

    Did this make any difference to selecting neutral?
    Any bigger on 9XX could make it a bit hard to find sometimes.

    Havent done the 790 yet but may start with 0.4 (0.14 mm²) which doubles the flow rate.
    Mud Bucket likes this.