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Project GSXR250 Grey Import project

Discussion in 'Your 250cc Projects' started by laverdagraham, Feb 3, 2018.

  1. laverdagraham

    laverdagraham Active Member Premium Member

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    My son and I are working on a late 80's GSXR 250 project and have some engine noises that we need to track down. After a general tidy up, new oil & plugs, fiddly carb balance, she is running sweet and seems to rev freely without any unusual behaviors. We haven't been able to road test it yet as it is not registered but all is ready for the roadworthy inspection. When idling, there is a rattle that is almost like a loose cam chain, which disappears once the revs climb above 2000. With the old screwdriver to the ear stethoscope, the rattle appears to be coming from the alternator side of the motor but is hard to tell exactly. If anyone has experience on these engines, I would appreciate any advice / guesses as to what might be the cause of such a noise.
    Graham
     
  2. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    If you could get a video with good audio of the noise it would help.

    Cam chain / tensioner noises generally lessen the higher the RPM.
     
  3. laverdagraham

    laverdagraham Active Member Premium Member

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    I can give that a go. My sons mobile phone take a pretty good video.
     
  4. gregt

    gregt Well-Known Member Premium Member

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    Have you had the cover off that side yet ? It would appear that in old age some of these are developing a history of loose magnets in the rotor. Also things are very tight around the front of the motor on that side. Is the hose clip on the barrel fitting touching an exhaust pipe ?
     
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  5. laverdagraham

    laverdagraham Active Member Premium Member

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    Haven't had the alternator cover off yet. Will check the area for things like clamps + clips rubbing as you suggested. Hadn't thought of that.

    Cheers
     
  6. GsxJames

    GsxJames Active Member

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    Here’s a video of it running, sound does appear to be coming from this side of the engine.
     
  7. GsxJames

    GsxJames Active Member

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    Picture with the cover off, no magnets are broken or loose but the this plastic coating around them has come off in spots, thoughts?

    E057B35E-8EBA-424A-B81C-242FABCC22C0.jpeg
     
  8. Wozza

    Wozza Active Member

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    Hmmm thats a weird one.....could be cam chain...does the sound change if you pull the clutch in..could be a worn clutch basket.....also if the carbs are out of sync at idle most 4 cylinders bikes will make a racket......
    PS(edit)
    did you check if any play in the mains when the alt cover was off?
     
    Last edited: Feb 10, 2018
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Nothing loose or sticky in the starter clutch ?
    excuse the bad picture

    20180210_133559.jpg
     
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  10. laverdagraham

    laverdagraham Active Member Premium Member

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    We nailed it. Thanks Wozza for the direction, it was carburetor tune & balance. We figured that the noise changes with carb adjustments so we chased the balance/idle jet adjustments until a satisfactory result. The carbs are old and worn so it has been a challenge, but all good now.
     
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