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Help No final drive.

Discussion in 'Hyosung 250cc' started by Rob1976, Apr 7, 2018.

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  1. Rob1976

    Rob1976 Active Member

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    I've broken something but have no idea what. I was riding home the other day and being a little too agressive down shifting for a corner when i had a sudden loss of drive. The engine still runs fine and i can hear the click from each of the gears but have no drive to the wheel. I have removed the clutch cover and checked the gears that connect the engine to the clutch and gearbox, everything is fine there. So as a guess and fear is that it might be a broken shaft some where.
     
  2. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    Well I had something similar happen on my FZR250 - the retaining nut for the sprocket made it's way free and then the sprocket made it's way off of the shaft splines to the end where the thread used to live
     
  3. Rob1976

    Rob1976 Active Member

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    :headbang: I never thought to look at the sprocket.
     
  4. Rob1976

    Rob1976 Active Member

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    yup missing the sprocket retaining nut. :oops:

    20180407_135703.jpg
     
  5. Andych

    Andych Well-Known Member Premium Member

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    Hope it hasnt chewed out the threads on the output shaft...
     
  6. Rob1976

    Rob1976 Active Member

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    yeah they've been rounded off

    20180407_141403.jpg
     
    • Bummer Bummer x 1
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Did it have a lock washer fitted?
     
  8. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    Unfortunately you need a new output shaft by the look of things
     
  9. Rob1976

    Rob1976 Active Member

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    Looking at old pictures there wasn't one on it when i bought the bike.

    Yeah it's looking that way.
     
    • Bummer Bummer x 2
  10. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Last edited: Apr 7, 2018
  11. Rob1976

    Rob1976 Active Member

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    Thanks.
     
  12. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    That shaft would have enough splines left to go for a little while if you took it gently.
     
  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    There is a Hyosung GT250R on gumtree atm $600, if you want to keep the bike. swap engine's and get some spare's
    Probably get it cheaper too
     
  14. Rob1976

    Rob1976 Active Member

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    Yeah i saw that. Ive contacted the seller just waiting on a reply
     
  15. Mike Fulcher

    Mike Fulcher Active Member Premium Member Contributing Member

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    Look I agree with Murdo, there is plenty of spline left to keep you going, clean the spline & the inside of the sprocket thoroughly, & apply Loctite 262 (Red) to the splines & retaining nut, & yes fit the correct lock washer, that is a washer that is splined on the inside & once tightened to the correct torque figure you use a punch to fold an external edge up over one of the flat edges of the nut. Then wait for at least 8 hours for the loctite to cure before using the bike.
     
  16. Rob1976

    Rob1976 Active Member

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    Unfortunately only the first 2 threads arn't damaged. All the others have been rounded off when the sprocket came off the splines. I think trying to get adequate tension would only strip them.
     
  17. Wozza

    Wozza Active Member

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    If your going to replace the motor tack weld a new sprocket on..if you decide to later to do repairs/rebuild just grind it off as the shaft is a total loss
     
    • Agree Agree x 2
  18. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Was going to suggest that but didn't want to be thought of as 'rough'. :lolsign:
     
  19. Wozza

    Wozza Active Member

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    I like to think of in terms of "Necessity is the mother of invention" :D

    or for the more intellectual ones

    “Necessity is the mother of invention is a silly proverb. Necessity is the mother of futile dodges is much closer to the truth. The basis of growth of modern invention is science, and science is almost wholly the outgrowth of pleasurable intellectual curiosity.”
    ―Alfred North Whitehead
     
    Last edited: Apr 8, 2018
  20. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    So you're saying weld it, and flog it off ?
     
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