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I just want to let you know that I had a leak from my exhaust side tappet cover at only 6000 kms. I changed the seal and everything is back to normal.



Keep an eye on yours, mine was leaking really badly.



Cheers ;-)
 

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I just want to let you know that I had a leak from my exhaust side tappet cover at only 6000 miles. I changed the seal and everything is back to normal.



Keep an eye on yours, mine was leaking really badly.



Cheers ;-)


Just noticed mine as well at 8000 miles. replaced mine as well just the other day.
 

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I replaced the valve cover o-rings 4,000 miles ago. The other day I adjusted the valves and noticed the o-rings were starting to go flat. Normally I would have changed them but I am really curious how long they will last. These are non-Yamaha bought at a local place that specializes in different kinds of seals and gaskets and o-rings.



Did you guys use genuine Yamaha o-ring?

 

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I use ordinary 1 1/4" O-rings with roughly the same size cross-section. They cost me 40 cents each at the local machine shop. The original (exhaust side) lasted about 30,000 km before it needed replacing...and I check my valves often!



I have more problems with the valve cover screws! Stripped one on the exhaust side a while back and had to replace it with a stud...now, I have another one on the exhaust side that feels "stripped" as well!
 

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I use ordinary 1 1/4" O-rings with roughly the same size cross-section. They cost me 40 cents each at the local machine shop. The original (exhaust side) lasted about 30,000 km before it needed replacing...and I check my valves often!



I have more problems with the valve cover screws! Stripped one on the exhaust side a while back and had to replace it with a stud...now, I have another one on the exhaust side that feels "stripped" as well!


You are tightening them to much! IMHO

I tighten mine, compressing the o-ring, until metal to metal contact and then just a teeny tiny bit tighter. I have never had one come loose.
 

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The Yamaha o-rings fail quickly when engine temps are high, especially on the exhaust side. I use Viton o-rings and replace them every other change. Cheaper to buy in bulk from an industrial power supply than from Yamaha.
 
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