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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 Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Mount Fitzroy, Argentinian Patagonia



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  #1  
Old 28 Jun 2016
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Thanks Bob!

That was the issue! The new YSS shock has the spring set higher in the shock structure where the breather hose connects to the air box. It partially restricts it when you sit on the bike as the spring compresses. When you take the bike off road and hit impacts the spring was closing the vent line fully causing oil to purge out of the main seal.

Problem solved and thanks again!

Eric
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1989 US XT600 main shaft oil seal leak-shock.jpg  

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  #2  
Old 28 Jun 2016
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140 bikes, and impressed by 37.000miles on a bike? You need to cover more miles on a single bike, haha.

I've seen 2-strokes go further without beeing opened.


Glad you got the bike sorted, it looks mint!. Keep and eye out for the leak, usually the seals can/will keep seeping a bit, once they've started to, whatever the reason was.
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  #3  
Old 28 Jun 2016
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Quote:
Originally Posted by Jens Eskildsen View Post
140 bikes, and impressed by 37.000miles on a bike? You need to cover more miles on a single bike, haha.

I've seen 2-strokes go further without beeing opened.


Glad you got the bike sorted, it looks mint!. Keep and eye out for the leak, usually the seals can/will keep seeping a bit, once they've started to, whatever the reason was.
Thanks for the advice!!! yes I will watch the seal... I can see once they leak they could continue even if they are new like in this case.

Yes... I have had too many bikes!!! Most of them just to look at then sell later on.

Now I just have two that I love... this XT600 and a KTM 500EXC The XT is really fun with the suspension updates and of course the motor is just great even with the stock exhaust.
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  #4  
Old 28 Jun 2016
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Glad you found the problem.
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Remember that Assumption is the mother of all f**k-ups.
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  #5  
Old 28 Jun 2016
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Thanks again Bob.. you nailed the issue right off the bat...!
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  #6  
Old 13 Sep 2016
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XT mainshaft leak update and jetting

Thanks SO much Bob and Jens!

Well you were correct! Once a seal starts to leak it will leak even with the pressure issue resolved. I corrected the breather line and the main shaft seal still leaked yet it was less.

New seal... no more leaks! Very interesting considering the old seal only had 25 miles on it.

One more question... the exhaust is stock as well as the air box. I did remove the rubber intake snorkel and there are some small holes drilled in the box by the original owner.

Jetting is stock at 125 main and 48 pilot. the bike runs just fine as is yet the cylinder head temp after a run is about 255 F. I would like to get that down a bit... would a 130 main on the primary carb be ok? I do not think I need to change the secondary carb... the TT600 uses a 135 main there and the XT has a 135.

The stock pilot is fine as going any higher will make it harder to start as it is too rich.. I had to turn the needle in to get it to start easier when hot.

Thanks for the advice!

Eric
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Old 13 Sep 2016
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Sorry! TT has a 135 XT has a 130 secondary carb jet.
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  #8  
Old 27 Sep 2017
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Quote:
Originally Posted by esacco View Post
Thanks Bob!

That was the issue! The new YSS shock has the spring set higher in the shock structure where the breather hose connects to the air box. It partially restricts it when you sit on the bike as the spring compresses. When you take the bike off road and hit impacts the spring was closing the vent line fully causing oil to purge out of the main seal.

Problem solved and thanks again!

Eric
Hi Esacco. I'm interested on that shock. Please, Can you share the yss code? I Need another help. Can you measure the stroke of the shock? Thanks a lot. Nice bike.

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  #9  
Old 28 Sep 2017
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shock

Hi there! The shock # is MZ506-395TRL-01-X

It is a little longer than the stock unit.... .25 inch or so. The stroke is the same as the stock or close to it. The difference is NIGHT AND DAY!!! You can literally FLY off road and jump off of 4 ft water bars without bottoming. The stock unit is totally worthless.

THey are VERY high quality and also can be rebuilt. Get it on Amazon for the best price.
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  #10  
Old 30 Sep 2017
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Originally Posted by esacco View Post
Hi there! The shock # is MZ506-395TRL-01-X

It is a little longer than the stock unit.... .25 inch or so. The stroke is the same as the stock or close to it. The difference is NIGHT AND DAY!!! You can literally FLY off road and jump off of 4 ft water bars without bottoming. The stock unit is totally worthless.

THey are VERY high quality and also can be rebuilt. Get it on Amazon for the best price.
Yeah!! Many thanks.

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countershaft, main shaft, oil leak, transmisson sproket


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