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Worn gears on 34L/55W Worn gears on 34L/55W
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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 Andy Miller, UK, Taking a rest, Jokulsarlon, Iceland

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Photo by Andy Miller, UK,
Taking a rest,
Jokulsarlon, Iceland



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  #1  
Old 17 Jul 2008
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Worn gears on 34L/55W
Morning all,

I have the bottom end of my Tenere project out and on the bench and was going to replace 4th and 5th gears as it seems to be recommended by most Tenere owners.

Silly question from a relative mechanical dunce, but which of the shafts do I need to replace the gears on? Main, counter or both?

As this engine has not been running since I had the bike, I have no idea as to whether they are worn or not, but I thought while I've got it stripped I would sort out a potential later day problem and save me having to take the motor apart again.

Many thanks in advance

Andy
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  #2  
Old 17 Jul 2008
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damages
Once that you have engine stripped out damages will be easily visible. You will see surface of the wheels teeths damaged, and once that you open, everything that is damaged needs to be replaced, seen the high cost of opening...
If you search on www.xt600.de xt600 xt600e Tenere Ténéré - XT 600 von Yamaha there are also two small modifications to earlier XT engines, one regarding an added nozzle to add some fresh oil flush right to 5th gear, the other related to oil pump (to be replaced with newer model), the first one can be done only when splitting engine.
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  #3  
Old 17 Jul 2008
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Quote:
Originally Posted by cyberzar View Post
Once that you have engine stripped out damages will be easily visible. You will see surface of the wheels teeths damaged, and once that you open, everything that is damaged needs to be replaced, seen the high cost of opening...
If you search on www.xt600.de xt600 xt600e Tenere Ténéré - XT 600 von Yamaha there are also two small modifications to earlier XT engines, one regarding an added nozzle to add some fresh oil flush right to 5th gear, the other related to oil pump (to be replaced with newer model), the first one can be done only when splitting engine.
Danke

Unfortunately my German is not very good - do you have a direct link or more information? Sorry for the trouble!

Gruß
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  #4  
Old 17 Jul 2008
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mainly here:

Translated version of http://www.xt600.de/xt_werkstatt/+special/-special-oelkreislauf/index.htm
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  #5  
Old 17 Jul 2008
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search for:

Verbesserungsmöglichkeiten im Ölkreislauf

and

in das Kurbelgehäuse über dem 5. Gang

in the ORIGINAL german version to se two pictures of the trick, and read well all related hints with a specialist if you try to do it
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Old 17 Jul 2008
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I cant get the translator, or the others are there any direct links?
Thanks! Steve
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Old 17 Jul 2008
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Quote:
Originally Posted by yhprum View Post
I cant get the translator, or the others are there any direct links?
Thanks! Steve
Hi Steve, in my post N#5 there are no links. I say that to see the pictures in the page, translated version does not work, so if you want to see the modification you have to search that text in the german version, and clik on the link.
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Old 17 Jul 2008
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Thanks Cyber, I cant find the original on the german website to look at the pictures.Steve
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  #9  
Old 17 Jul 2008
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it's written in post number 4# , same thing without google part

www.xt600.de Ölkreislauf - Special
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  #10  
Old 7 Dec 2008
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has anyone had any luck with this?

I can't speak/read German but i think get the idea. It's hard to tell until you have the bits in your hand to match to the pics (i haven't striped an xt yet so i can't ID a lot of the internals).

I'm i right in thinking this changes the oil suply from low (return) to high (feed) pressure? (effectivly bringing the circuit in line with 3aj?)

How much of an effect is this likely to have on gear life? or is this a how long is a peace of sting question?

Sam
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  #11  
Old 7 Dec 2008
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Yes ... no
The additional oiljet onto the 5th gear gets relatively cool oil from the oil tank, direct from the filter. This opposed to the relatively hot oil coming from the sump that is being pumped back to the oil tank.
Reading this back, it is quite non-uderstandable.
There are two circuits:
1 starts from the oil tank, to pump, thorugh filter, and lubricates crankshaft, engine top end. This oil has passed through oil cooler and filter.
Then, there is the second circuit that gets oil from the sump and pumps it patrly back to the oil tank, and partly to other parts like the gearbox. Before this oil arrives in the oil tank, it passes through the oil cooler.
On the older XTs oil from the second circuit was directed to the jet for the 5th gear. As you say, this yet now gets oil from the 1st circuit.

As to how much this will help: yes :-)

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