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loud ting or clack in motor
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I recently purchased a 2006 TTR 250 which sat unused for years. I am not a very experienced mechanic. After cleaning the carb and jets, new tire, air filter, battery etc I started it and, like an idiot, ran it without even checking the oil. Soon I heard a loud noise from the engine sounding like a wrench tapping on it. I filled oil which was almost gone, and sound went away, but after a few minutes running it comes back, albeit not as loud. I am sure I have a serious problem now which will end in catastrophic failure if not immediately addressed. Any advice would be appreciated.



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Unfortunately it doesn't sound to good mate. Engine with no oil means metal parts have ground against each other. Have you dropped the oil after you started it to see if there are any metal shavings in it?

That on its own can circulate around the engine and cause more damage.

You could of damaged the cylinder lining and piston. Afraid your going to have to take the engine apart.


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Welcome to the forum! (PS Can you put some info in your profile so we at least know your country please?)

Matt is right - doesn't  sound good. You need to strip the engine to check for damage. Lots of possibilities for damage no



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Welcome aboard, sorry to hear of your engine problem. If an engine rebuild is something you do not have the confidence to attempt yourself, paying for someone to do it for you is likely to get expensive, so you may have some decisions to make.. Anyway good luck with it

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Pete. South Somerset, England.



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Welcome to the forum mate

It sounds like your going to need some advise from here very soon no

Hope it's not to bad

BM



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well dropped oil and filter, dirty but no metal. I can't afford to have the motor rebuilt, either I fix it or I let the boy ride it till it blows.



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The beauty of an air-cooled four stroke single like the TTR is that it is relatively simple for the home mechanic to work on.

If you want to have a look here it will give you a good idea as to what is involved in an engine strip down.

Brian



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much appreciated I will get on it.



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something is making an intermittent loud single clack no rattle runs good otherwise any idea what I would be looking for?

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Could be any number of things still, seized bottom end bearing is just one of the issues from oil starvation. On my mates 600 the big end bearing seized and the Con-rod shot through the front of the engine and set it on fire.. no



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peteBLUEttr wrote:

Could be any number of things still, seized bottom end bearing is just one of the issues from oil starvation. On my mates 600 the big end bearing seized and the Con-rod shot through the front of the engine and set it on fire.. no


Hey Pete, I hope that's a worst case scenario, I'll make sure I check every time I ride from now on wink 



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Could you record the noise (perhaps in a video) so that we can hear it Rob?

PS Not keen on the avatar!



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ah yes I should have but now am beginning to tear it down. Don't like hunters? Don't you eat meat? I don't enjoy killing but she gave us a lot of good meat and at least she lived free and died fast unlike factory farmed animals.



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Good luck with the engine rebuild Rob! I think Brian just mentioned because the pic looks like some sort of eery sacrificial witchcraft ceremony or something.. smile I love venison burgers, dunno about anyone else. At least you killed humanely.



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Pete. South Somerset, England.



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LOL looking for drive chain at Yamaha parts store says chain is obsolete. Venison is very lean but I made a lot of excellent cured jerky we loved it.

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found aftermarket chain better and cheaper than original



-- Edited by roscogre on Tuesday 30th of June 2015 05:59:25 PM

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You can stick any brand of 520 pitch chain on. Doesn't have to be Yamaha, Renthal and D.I.D are good too. Get an o-ring chain, they hold up much better. TTR's take around about a 116 link chain, may have to take a few links out if running smaller sprocket on back etc.

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Pete. South Somerset, England.



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exactly what I found, Renthal o-ring chain, thanks.



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thanks for responding everyone y'all have been a lot of help already

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ok here is the noise, only happens at low rpm after revving it: https://www.youtube.com/watch?v=soX047cJQLs&feature=youtu.be



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Weird noise!

I couldn't work out the timing though. Is it regular or random?

It seemed sort of regular as if pressure built up and then "clack"!

Or maybe there is something loose that works its way around before hitting a moving part again...  

Baffled confuseconfuseconfuse

It would be a shame to tear the engine down to find it was something simple and unrelated to the oil starvation.

I would be tempted to take the clutch cover off and see if there is anything loose, broken or damaged in the timing chain area. Well within the novice mechanics capabilities!

Brian



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will try thanks, timing is completely random and only happens at lower rpm after it has warmed up.

hope I can keep the bike going, I am a new fan of the TTR and had 4 yamahas previously



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A very weird noise. Does the noise disappear when you rev it? I would take the generator cover
and the clutch cover off and see if anything is amiss,start with the simple stuff
before progressing into the engine is always better, see if the engine can be turned by
hand and listen for any odd noises.


John.

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Thats quite a loud clunk/clack huh!

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If it's not something loose in the engine, could it be the oil pressure relief valve clacking. My recollection is that its a big ball bearing and strong spring.

Worth looking for debris in the oil pump as well.



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jasparach wrote:

A very weird noise. Does the noise disappear when you rev it? I would take the generator cover
and the clutch cover off and see if anything is amiss,start with the simple stuff
before progressing into the engine is always better, see if the engine can be turned by
hand and listen for any odd noises.


John.


yes the noise disappears when I rev it. 



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Will try thanks for all the help.

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Now riddle me this Batman: I took off the clutch cover and found a few tiny pieces of rubber and metal under the screen. One of the pieces had a curious shape. It was about a millimeter across, and it looked like it was made out of a strip stainless steel bent into a U or rounded W shape. The piece actually looked like an upside down J and a U pushed together but it seemed to be broken as if maybe the original was something like this viewed on edge: www.qrg.northwestern.edu/projects/vss/docs/media/Communications/frequency.gif . Anyone know what this could be?

 

P.S. : I am hearing a loud intermittent clack at low rpms which caused me to investigate the situation further.

 



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Hi Rob

I have merged your new thread with this one so that we don't get two threads running that are asking the same question. Hope that's OK.

I can't immediately think what the pieces might be. Any chance of a good quality photo of them please?

Were there any other obvious signs of wear or damage? Any metal in the oil filter? 

Brian



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no metal in the filter, no obvious wear, pieces are too small and resolution not good enough on my phone.

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I don't have the time, money, patience, skill, tools, inclination and I'm sure a few more things to rebuild the motor. Maybe the kid can ide a few before the ****ing thing blows.

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sounds to me like it could be the sprag  its lost a few parts of the cage or rollers its grabbing and kicking against the starter ,

sprag clutches arnt cheap but if it has a kick start , may be you could bodge the sprag and remove the  idler gear between the sprag and starter .

id say its about an 80% chance I might be right .if so the engine is prob all ok , its just the starter set up .

hope this helps 

edited out my comment on the avjtar its got nothing to do eith this forum its all about the mighty ttr 



-- Edited by ttboof on Friday 3rd of July 2015 01:22:43 AM



-- Edited by ttboof on Friday 3rd of July 2015 05:35:14 AM

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Remove the starter , thats something ive been thinking about for a while now. I have the Auzzy model with a kick start as well. My theory is the cost of repair to sprag or starter motor. i have limited mechanical knowledge so any repairs would have to be at a shop. Im thinking remove sprag and starter motor now then replace items when im in my 60s TTR has 18,000kms on it so far and im 55 yrs old.  Maybe i can kick start for several years then use the push button later in life. 



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Sounds like the best option for me too hope it works. cheers and thanks g'day or whatever y'all say under there!

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Does the USA model of the TTR250 have a kickstart? I thought they were electric start only confuse



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It does sound very like the noise that a worn sprag makes when you
shut down the engine and it kicks back against the starter as ttboof has
said. If it is that it must surely be worth doing as it doesn't sound too bad
otherwise.

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no kickstart only electric but there is a hole with rubber stopper where you can install one

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push starting it should not be a problem for me however



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It seems an extreme move. It is worth getting the flywheel off to see if the sprag is intact first.

We didn't bottom out what the bits were. Any chance of a good quality photo of them?

Brian



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no my phone could not capture them resolution to low. At this point to me removing starter or disconnecting sprag clutch does not seem as extreme as tearing the whole motor down because I will probably never get it back together in working order and I do not intend to spend hundreds of dollars.



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It isn't a big job to strip out the sprag confuse



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good advice brian . is it possible to remove ghe round cover and remove the idler gear start and run the bike to see if the noise goes before going right into the sprag clutch removal .

might be an essy option to dignose the problem further 



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took out idler gear for starter, way too easy if this works I will be ecstatic.

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if the noise stops why should I do anything else?

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Might get a few different responses. I'm from the bush. And have two choices if the bike is a long term thing fix the sprag and use the starter 

Or if it's just a basher and your willing to just take a punt hope on and ride. If your lucky any further pieces end up in the bottom of the sump if it falls apart a lot of noise then eventually she dies .

 



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Advice on removing/replacing the sprag here

This is what a broken sprag looks like.

Broken_sprag2.jpg

Broken_sprag3.jpg

 

I wonder if any of your "bits" look like the tooth retaining spring:

Sprag clutch spring.jpg



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Good idea Brian .

It's got me thinking .didn't ride today it was s bit cold only got upto 19deg .

Looking forward to solving this one 



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one very small piece looked like it could be from the thin strip of bent sheet metal holding the "teeth" in. It was so small though, like a millimeter. Soon as I get some gaskets in the mail I will put it back together fill it up with oil this time and fire it up to see what it sounds like.

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If you have the top of the engine of and have bits of metal that could have gone in the bottom of the engine. I would suggest flushing the engine out, as them little bits of metal can cause more problems! I learnt the hard waynonono



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well I can't push start it, bike is too light and no traction on my gravel road.

Put idler gear back in and rode a little, sounds ok but I didn't get too hot or let it idle low long.

One more clue: bolts on cover to idler gear are stripped, had to use vice grips to get them out!

Looks like I'm back to square one just let the boy ride and hope for the best.

Need that chain and sprocket on though.

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