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Can you diagnose this?
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Im trying to find out what it wrong with my xt600z, so I have recorded 12sec of sound. Its .mov, quicktime, so I hope you can hear it and maby tell me what it is? Some knocking. I think it has a Wiseco piston, and some say it will make some noise, but that it is harmless..
Now lets just see if Im able to post the file... Well, finally converted it to mp3...Attachment 3139 |
Could you post in another format? mp3 or even wave...
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Believe me, Ive tried... even downloaded new program to convert the file, but no, couldnt do it..."Unable to open" it said.. Tried to post it via youtube too, but all I got was an error message.. It works fine with Quicktime, so I dont know why it cant be converted...
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afterall VLC media player plays quicktime! ;)
I'll hear the clip a few times and I'll post back if I think of something! |
Mate.. I believe you have a little work to do on that engine... it could be a few things.
I don't want to say anything bcoz I am not sure and don't want you to get paranoid.... What I would do is: check your engine compression(it should give you an idea on the state of your piston and piston rings) check the valves gaps and camshaft chain but that noise.... it sounds like a bad crank bearing or some loose nut inside the engine.... I suggest you to check everything first and not ride the bike at all... :funmeterno: Vando |
Well its been like that since I got it, and Ive driven 2-3000km on it... sounds a bit worse on the pc I guess.. I had my Iphone close to the cylinder when I recorded it. Sounds like it comes from the top end..
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Oh... now that explains a few things lol...
do the compression test and after that check the valve clearances! How many miles or km does the bike have? |
Thats a KNOCK more than anything.
Does it go away when "blipping" the throttle? More or less when under load? Loose counter balancer? |
It only has 30000 km on it..
The knocking is not so bad when I twist the throttle and put pressure on the engine |
little end bearing is no good causing the piston skirt to scrape the barrel :thumbdown:
top end rebuild at least depending on how long and what oil contamination has done to the rest of the engine :thumbdown::thumbdown: |
Hmm, thats no good I guess... Whats the "little end bearing"? Sounds like a lot of work. Never done that before. Well Ill better hit the garage and start. Is there any good online descriptions on how to do the top end? Preferably with pics?
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Not sure its that, especially if it goes away when loaded ? Yep, you best take the head off and investigate |
Difficult to diagnose without hearing it from different areas of engine using either the "long screwdriver with the handle in your ear" method or if you're posh, a stethescope(sp?).
Does the noise diminish or increase once the engine is warm ? or when under load ? I would make sure your valve clearances are within tolerance as a first step but as said by others I would suspect piston slap. Should get away with a cylinder hone, new piston and rings and small-end bearing. |
Well now Ive started to take it apart. Checked the valve clearanses; loose 0.10mm on exhaust, bit tight on intake so I adjusted to a tight 0.10mm.
I have a Clymer for the XT, so Im going for it.. more work than I thought, lowering the engine to get the top off, and its all so #¤% TIGHT... Ill keep you informed on the progress, and thank you all for good help :-) |
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For å sjekke slakk må du ta av stemplet, sette pinnebolten tilbake i råden og kjenne om det er slakk. Ofte kan det være pinnebolten som er skadet, den kan få en lett timeglassfasong. Skal du av med toppen er det ikke mye ekstra jobb å skjekke dette, |
The mystery is solved...got interrupted with a family dinner, but now the whole top end is off, and Its the bearing between the crankshaft and the connecting rod that is worn...I could both feel it and SEE it... :(
Was hoping I didnt have to split the whole engine, but theres no way around now... Any tips on what new parts/gaskets and stuff I need when doing that, and where I can get it? And who can change the bearing? Thanks for all tips:thumbup1: Osmund |
thats a serious rebuild job you got there :thumbdown:
a big end bearing (conrod to crank) needs to be done by a specialist it can't be done at a local motorcycle repair shop :( you need a full gasket set, engine assembly paste, and some thread lock. i'd also recomend changing the woodruff keys on the crank and balance shaft. |
Well now how do I get the left side cover off??? Can the starter stay attached or do I have to remove it? Tried to loosen the cover over the starter, but it sticks very hard..Im afraid of breaking something... Aint fun being green right now...:-/
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you're gonna need to split the cases to do the crank :( so you might aswell strip everything off the engine so that means the starter motor too, the smaller side cover that covers the starter gear has to come off anyway because there is screws that hold the main side cover on under it:innocent:
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Thank you for the answer. Was hoping there would be an easy way to do this, but I guess there isnt.. hehe
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if you don't know what you are doing you may want to take the engine to a repair shop or enlist the help of someone who has rebuilt an engine before - will save you a lot of grief and money (and time).
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Nah, there has to be a first time, and its the only way to learn. Im not THAT green, just a few questinons here n there..... and I like doing it ;-)
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i know its not ideal listening to a download, but something simple to check before pulling the engine apart is what i found on my varadero a couple of weeks ago, and sounds very similar to this,
the down pipe was loose on the engine causing a blow that sounded just like a knock, coming every two revs. |
n.....thats good advice - keep an eye for ahything loose or "not quite right" as you go - you may find the problem without a full stripdown.
Good Luck |
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