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Blown Head Gasket XT600 Blown Head Gasket XT600
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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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  #46  
Old 3 Aug 2015
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Took to yamaha dealer.
Knowledge guys, they said to invest in head and rocker box. They also noticed that the valve springs were upside down.
Seems more problematic to mill this head and hope it doesn't get milled to far.
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  #47  
Old 3 Aug 2015
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Jjrider
Let me know if you want to sell a head and rocker box.

Greg
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  #48  
Old 3 Aug 2015
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Quote:
Originally Posted by ajax View Post
Took to yamaha dealer.
Knowledge guys, they said to invest in head and rocker box. Tar.
Why?
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  #49  
Old 3 Aug 2015
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I agree ^

From what I can see it can be salvaged. If you want send them to me and I'll fix it , not a problem. If the scratches are deeper than they look in the picture I can weld them up and then faced so minimum taken off.


Summers wasting, time to get back riding.
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  #50  
Old 4 Aug 2015
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IMO I think welding the head will soften the aluminium in that area, increasing the chance of future head gasket leakage, especially where the flame ring seals.
Once the welded area has been softened, there is also the risk of the exhaust valve seat next to it coming loose.

Bob
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  #51  
Old 4 Aug 2015
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It can be done.
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  #52  
Old 4 Aug 2015
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Here's a sample of head/rocker box if I go that way.
Yamaha TT600 Cylinder Head Valve Cover Rocker Arms TT 600 83 86 | eBay
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  #53  
Old 4 Aug 2015
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That head is cheap enough, good also that the rocker box is included. Some on eBay separate them to sell them individually. Bad idea...
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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  #54  
Old 4 Aug 2015
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Won't fit your '89 cylinder. "88 and '89 have a different hole pattern.

Plus the one cam bore is wobbled out, mostly on the rocker cover side. Side of the cam chain
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  #55  
Old 4 Aug 2015
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So my options are for only an 88/89?
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  #56  
Old 4 Aug 2015
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I know the rocker box had an extra bold but i didn't know there would be a problem bolting the head to jug. Thanks for that!!

http://www.ebay.com/itm/231637695366...witem=&vxp=mtr

If this is a good fix I would get this. But not the right years right....
Please let me know

best
Greg
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  #57  
Old 4 Aug 2015
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Only the ones off an '88 or '89 will fit your jug, unless you get an older jug, they all fit on any year bottom.

The tell tail difference is that second bolt on the end of the cam chain tunnel. The newer ones have a bolt on each end, the '87 and older only have the bolt on one end. The 2 studs around the bore are spaced different also.


I was eyeing that last one for a while, looks in good shape, waiting to see if he comes down a bit .Don't really need it but if cheap enough. I'd prefer the newer style.
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  #58  
Old 5 Aug 2015
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Don't know if my jug is original. Here's pics
https://www.dropbox.com/s/6xm6d02o7w...94518.jpg?dl=0

https://www.dropbox.com/s/hb8ffkh0ds...81%29.jpg?dl=0
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  #59  
Old 5 Aug 2015
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That's a '84-'85 jug.


Didn't you post about the valves being new or reworked on your current head ?
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  #60  
Old 5 Aug 2015
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So I should be able to use 83-89 heads?
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