Is this oil leaking through the Power Valve gasket?

motoGleamer
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motoGleamer
Edited Date/Time 8/11/2019 8:34pm
I had posted this in the "moto" section but this may be the more appropriate place for my question. Can anyone tell me whether or not this is premix leaking through the power valve gasket? I noticed it while cleaning the bike. It's a yz250 (2t). Thanks.


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Paw Paw 271
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Paw Paw 271 8/11/2019 8:16pm
8/11/2019 8:16pm
Yes, that is what it looks like.

Paw Paw
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motoGleamer
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motoGleamer 8/11/2019 8:26pm
8/11/2019 8:26pm
Paw Paw 271 wrote:
Yes, that is what it looks like.

Paw Paw
Thank you. From my research into this it seems like this may be a common problem with 2 strokes and is not usually a worrisome problem. Any thoughts?
Paw Paw 271
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Paw Paw 271 8/11/2019 8:28pm
8/11/2019 8:28pm
It should be ok, but you may want to replace the gasket on the next top end job.

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motoGleamer
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motoGleamer 8/11/2019 8:34pm
8/11/2019 8:34pm
Paw Paw 271 wrote:
It should be ok, but you may want to replace the gasket on the next top end job.

Paw Paw
Got it. Thanks!

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DuroTools
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DuroTools 8/12/2019 10:11am
8/12/2019 10:11am
Paw Paw 271 wrote:
It should be ok, but you may want to replace the gasket on the next top end job.

Paw Paw
It's not the gasket, the gasket is just a dust cover basically for the power valve linkage, it's a seal on the right side engine cover that goes around the power valve linkage shaft or on the yamaha diagram it might be called the "Governer". Also when replacing that seal, check the rod that goes through the seal for wear. If that has wear I'd replace too even though you have to buy the whole PV linkage which is almost 90 bucks.
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motoGleamer
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motoGleamer 8/12/2019 12:14pm
8/12/2019 12:14pm
Paw Paw 271 wrote:
It should be ok, but you may want to replace the gasket on the next top end job.

Paw Paw
DuroTools wrote:
It's not the gasket, the gasket is just a dust cover basically for the power valve linkage, it's a seal on the right side engine cover...
It's not the gasket, the gasket is just a dust cover basically for the power valve linkage, it's a seal on the right side engine cover that goes around the power valve linkage shaft or on the yamaha diagram it might be called the "Governer". Also when replacing that seal, check the rod that goes through the seal for wear. If that has wear I'd replace too even though you have to buy the whole PV linkage which is almost 90 bucks.
The bike seems to be running fine. Any reason worry about it until I get a chance to replace it?
Prototype69
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Prototype69 9/23/2023 8:58pm
9/23/2023 8:58pm

IMG 6615I to have a 97 Yz250 2 stroke and it’s Leaking Spooge out of my Power valve cover a recent development? Heard many variations what could be but do it before seams like it started after repacked the silencer?

Question 

 

Wiscomx
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Wiscomx 9/24/2023 6:27am
9/24/2023 6:27am

A lot of times the rod that runs thru to the power valve wears out seal and bore, sometimes a new seal works of drill bigger and install a bronze bushing, if it’s running fine just leave it.

Gator 4
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Gator 4 9/26/2023 8:52pm
9/26/2023 8:52pm

No reason to worry.  Very normal for some oil to seep on power valves.   Have fun riding and replace whenever it is convenient.

40acres
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40acres 9/27/2023 5:56pm
9/27/2023 5:56pm

Awe man, thanks for bumping this thread. Sure do miss Paw Paw's posts. 

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