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Thread: '87 GN250 with engine clicking & ticking?

  1. #1
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    21st November 2014 - 11:53
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    '87 GN250 with engine clicking & ticking?

    I recently bought an older nth hand Suzuki GN250, and at time of purchase everything seemed fine. The first thing I noticed was the noise coming from the engine. A strange clicking, tapping, or ticking noise. After some research I'd learned that this could be valve noise, requiring a valve clearance adjustment. Fast forward about a week I'd gotten the valve clearance adjusted properly according to the manual, with a proper tappet adjustment tool, feeler gauge, and all. No joy. Since then the noise has been getting gradually worse, and it really has me worried. My question is where should I look next for the problem? Is this even worth worrying about, should I just ignore it?

    If you care to have a listen, I've uploaded some recordings here: http://h0dgep0dge.github.io/gn250.html
    One is the raw recording and the other is the same recording, with a 2KHz high-pass filter.
    Throughout the recording I rev the engine from around 1250 up to 4000 and move the microphone close to and far away from the engine. Listen all the way through to get all the information.

    Cheers.

    EDIT: So apparently there is no way to edit the title. It's just a typo, ignore it

  2. #2
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    28th October 2012 - 13:59
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    Billy Goat Gruff?
    Political Correctness, the chief weapon of whiney arse bastards

  3. #3
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    Quote Originally Posted by buggerit View Post
    Billy Goat Gruff?
    What are you referencing?

  4. #4
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    Quote Originally Posted by h0dgep0dge View Post
    What are you referencing?
    Hunting And Fishings new cookbook, "Catching,cleaning and cooking Trolls and other small game"
    Political Correctness, the chief weapon of whiney arse bastards

  5. #5
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    19th November 2007 - 13:39
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    I wouldnt ignore it!!!

    Is it using oil???


    Quote Originally Posted by Katman
    If you only view one side, your view can hardly be called balanced.

  6. #6
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    17th July 2005 - 22:28
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    Has it even got oil?
    If I remember to PM you when I'm back in Hatsings I can have a look at it for ya, I think I might still have a few GN parts floating around
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
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  7. #7
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    Quote Originally Posted by Murray View Post
    I wouldnt ignore it!!!

    Is it using oil???
    I don't know if it's using it up, but the level is fine as of right now, perhaps 2 or 3 mm below full.

  8. #8
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    similar noise to what I had in wifes GB400 and it was a broken cam chain guide. Doesnt sound like valves. As said above it almost sounds like it has no oil in the engine??

    sorry cant help much but hopefully someone can


    Quote Originally Posted by Katman
    If you only view one side, your view can hardly be called balanced.

  9. #9
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    Quote Originally Posted by Murray View Post
    As said above it almost sounds like it has no oil in the engine??
    There's certainly oil in the engine, though is it possible that it's not being circulated properly?

  10. #10
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    16th November 2005 - 07:48
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    Man I dont remember my old GN sounding so tractor like. Never did record it though. If you have adjusted the valve clearance my next suggestion would be checking the cam chain and chain guides.

    For the record Qkkid was in my bed, not the other way round

    Quote Originally Posted by Yow Ling View Post
    Pumba is a wise man.

  11. #11
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    Quote Originally Posted by Pumba View Post
    Man I dont remember my old GN sounding so tractor like. Never did record it though. If you have adjusted the valve clearance my next suggestion would be checking the cam chain and chain guides.
    That's what the manual suggests. I'm currently in the middle of a move, and I don't know yet how involved the procedure is, so I may have to wait a few days before I can take a look. I'll report back when I do.

  12. #12
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    GNs do wear the cam journals quite often, and they shit guides, tensioners and chains. I probably have guides, tensioners and chains, doubt I have a head though
    Quote Originally Posted by Paul in NZ View Post
    Ha...Thats true but life is full horrible choices sometimes Merv. Then sometimes just plain stuff happens... and then some more stuff happens.....




    Alloy, stainless and Ti polishing.
    Bling your bike out!
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  13. #13
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    21st November 2014 - 11:53
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    I've just gotten around to taking a look, and so far I've got the cylinder head cover off. If anyone has any advice on exactly where to go from here, that'd be great. I've only had a look at the faces on the rocker arms, but I'm not sure what I should be looking for there. They look like they might be worn, but it could also be regular grinding marks. They're slightly convex, that's really all I notice. I can post pictures if anyone wants to see anything.

  14. #14
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    Quote Originally Posted by h0dgep0dge View Post
    I can post pictures if anyone wants to see anything.
    titties .

  15. #15
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    Quote Originally Posted by Murray View Post
    similar noise to what I had in wifes GB400 and it was a broken cam chain guide.
    Just pulled the cam shaft and one of the cam chain guides out, nothing of note yet. I'll get the other guide out later and post back.

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