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Strange noise in the engine

My XT with this strange noise in the engine, not valve, there is chain of command, with my xt is 23000 km and the year it is 2008.
I find it difficult to search, someone could tell me some topic?
I found this: http://www.xt660.com/showthread.php?...y+noise+engine

You would need to describe the noise in more detail for us.

When do you hear the noise, at idle, at a curtain rpm not riding, only when riding, when accelerating, on over run, when does it make the noise?

Can the noise be heard when Hot or cold?

Where abouts do you hear the noise, from the top of the motor, bottom of the motor, left or right side of the motor?

I went to a trusted mechanic, he heard the engine noise and also confirmed that noise rod knocking.
The noise is from the left side.
The bike is only with 23,000 miles and all exchanges were made of oil

im having simular problem :(

http://www.xt660.com/showthread.php?t=14724

Quote:

Originally Posted by iShoe (Post 137261)

im having simular problem :(

http://www.xt660.com/showthread.php?t=14724

I made a small sound recording and I'll post here later.
this already in the xt660 Yamaha.

Strange noise in the engine

http://www.youtube.com/watch?v=2vUSdLec8yg

Quote:

Originally Posted by arnilton (Post 137257)

When you have the motor stripped let us know what you find.

It sounds like a bent valve to me but then again i know **** all about bikes

Not a bent valve, the motor would not run with a bent valve it's a single cylinder.

Get them to check the decompressioner & pin encase there is a problem there before they pull the motor out. Best get that motor stripped, I would not ride it like that.

the problem is a break in the rod to the crankshaft, but still can not remove the pin crankshaft to know the real problem.

http://www.forumxt600.com.br/forum/f...c01047_322.jpg
http://www.forumxt600.com.br/forum/f...c01049_181.jpg
http://www.forumxt600.com.br/forum/f...c01048_889.jpg

Holy crap, look at the colouring to one side of the con rod!

That must have been getting seriously hot in there for it to generate heat like that!

Primeiro apareceu um barulho estranho no motor,
esse video foi antes de levar a moto na oficina.

http://www.youtube.com/watch?v=2vUSdLec8yg
[video=youtube;2vUSdLec8yg]http://www.youtube.com/watch?v=2vUSdLec8yg[/video]

Primeiro pensei que era tucho ou valvula, quando cheguei na oficina o mecanico disse que era barulho de CORRENTE DE COMANDO, na revis�o foi constatado que a corrente de comando estava OK, ent�o o mecanico falou que poderia ser biela, levei em outro mecanico para ouvir o barulho e tb foi o mesmo veredito.
Ent�o deixei a moto na Yamaha para abrir o motor, ao desmontar a BIELA n�o foi encontrado nenhum problema.

http://i263.photobucket.com/albums/i...n/DSC00898.jpg

Mas foi encontrado uma ARRUELA solta na moto quebrada em tres peda�os

http://i263.photobucket.com/albums/i...n/DSC00915.jpg

No outro dia o mecanico "estudou" a arruela e todas as pe�as do motor e detectou que o desgaste da arruela foi na corrente de comando

http://i263.photobucket.com/albums/i...n/DSC00916.jpg

Da para observar o desgaste da corrente ro�ando na arruela, inclusive o "trilho" da corrente riscando a arruela.

http://i263.photobucket.com/albums/i...n/DSC00941.jpg
http://i263.photobucket.com/albums/i...n/DSC00921.jpg

Resumindo o problema foi encontrado..... Porem o peda�o que se soltou da arruela QUEBROU A TAMPA LATERAL DO MOTOR

http://i263.photobucket.com/albums/i...n/DSC00932.jpg
http://i263.photobucket.com/albums/i...n/DSC00930.jpg
http://i263.photobucket.com/albums/i...n/DSC00931.jpg
http://i263.photobucket.com/albums/i...n/DSC00927.jpg

Pois � o pedacinho que soltou da corrente bateu nessa engrenagem grande trincando o motor

http://i263.photobucket.com/albums/i...n/DSC00935.jpg
http://i263.photobucket.com/albums/i...n/DSC00934.jpg

S� resumindo, a arruela n�o � do motor pois a mesma � de INOX e no motor n�o tem arruela de inox, e revisei o catalogo 3 vezes pe�a por pe�a, tem arruela mas nenhuma com o furo pequeno

Sadly I'm far too ignorant to be able read the comments on the above pics, if anyone is enlightened and can translate I'd be very interested, great pics thank you.

The problem of noise was found, was loose in the washer motor in contact with the chain of command

Quote:

Originally Posted by arnilton (Post 137882)

The problem of noise was found, was loose in the washer motor in contact with the chain of command

where did that washer come from???

timing chain failure? seems like the washer was pin-balling round the engine, til it found a timing chain......

poor guy....the motors a mess..........

Quote:

Originally Posted by dazmatic (Post 137484)

Holy crap, look at the colouring to one side of the con rod!

That must have been getting seriously hot in there for it to generate heat like that!

The blueing of the crank web is normal, have a look at my Raptor conversion & you will see the same blueing on my crank.

Nice work at least you found the noise, thanks for showing us. How many KMs had the motor done?

My XT660 has only 21,000 km, and the engine was never opened

Does sound very funny as the engine hasnt had that many miles on it. It must have been something to do with a bad construction at Yamaha or something.

Hope it didnt cause too much damage and you can get up and runnning again soon?