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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by George Guille, It's going to be a long 300km... Bolivian Amazon

I haven't been everywhere...
but it's on my list!


Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



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  #16  
Old 21 Sep 2014
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Another update...decided to take cylinder off also....
It was over 8 months in workshop and this is what I get...

pretty.....

I checked the old head and new one and both pistons... Valves and piston seem ok, no hit marks and at old head they were restored when I got engine back from repairs.
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  #17  
Old 21 Sep 2014
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Wow thats really sad, end of story for that engine with parts of the piston all over...
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  #18  
Old 21 Sep 2014
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Its just plane sad what a lousy mechanic can do to an otherwise good engine.
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  #19  
Old 22 Sep 2014
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thats got to hurt !
Good luck .
Its looking like versions No 2. Too much oil may have hydraulic-ed the piston. As piston went to bottom of stroke it may have hit the overfull oil level and cracked ?
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  #20  
Old 22 Sep 2014
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Quote:
Originally Posted by beagle scott View Post
thats got to hurt !
Good luck .
Its looking like versions No 2. Too much oil may have hydraulic-ed the piston. As piston went to bottom of stroke it may have hit the overfull oil level and cracked ?

It's because the cylinder is bored oversize and a standard piston was used. Each firing slaps the piston as in his video(it was worse there because the skirt was already gone).Piston had .01" clearance which will always end the same way. Notice which side skirt is broken ,the side that would hit on combustion.

Hydrolocking would most likely cause the piston to break around the wrist pin (or blow the top off it)and bend/break the rod, maybe crack the cases around the crank bearings. By looking at an XT motor it would take probably close to 4 quarts to stop the piston.

I see that the picture that shows the .25 on the top of original piston wasn't posted here, but on ADV, so Beagle is probably not seeing what some of us others have. It's where I got into the too small piston problem. https://dl.dropboxusercontent.com/u/...tud/piston.jpg
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  #21  
Old 22 Sep 2014
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Angry
!! Yes that is it alright to sloppy from day one ! I haven't been on the other sight. he should stand by his mistake but as already said I wouldn't trust him much at all ! Good luck
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  #22  
Old 6 Oct 2014
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Little update.

Got the cylinder checked out and those are minor scratches, no need to rebore. Piston should be 95,25 like it was before the repairs and finally got in touch with the mechanic and when he saw that broken piston, he told that he is going to get new piston kit. Everything went smooth.
I don't know if it is true, but he told that cylinder size was checked out by local motoclub....although I think you can see that piston is too small when you put it into cylinder...

Most people told me, that there's no point to split the cases. I kind of think the same. Going to fill it with diesel and get metal dust and all the pieces out(already found most in the clutch area).

Also found this thing in other topic about KTM:
Quote:
On a Japanese bike? Flush it out and put another 50,000 miles on it.
That bike? Tear it apart.
The metal dust should not be the problem, cause oil filter is going to catch most of it and even when you brake in new engine, you get metal dust anyway.

In 100-200km oil change, then at 1000km. But all of this will be in about 2015 march/april cause of winter is coming and can't ride with icy roads+snow.
Under oil pump gear, theres a hole with some skirt pieces. You can see 1 piece there if you look closely.
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  #23  
Old 6 Oct 2014
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What size is the piston that cracked? if you dont need rebore you need to do some hone of the cylinder, good luck.
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  #24  
Old 6 Oct 2014
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Originally Posted by xtrock View Post
What size is the piston that cracked? if you dont need rebore you need to do some hone of the cylinder, good luck.
95.00 size, should had been 95.25. Yeah, will hone it.
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