1979 yz125 petcock issue

Swarley814
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Salem, OR, USA
Swarley814
Edited Date/Time 1/3/2021 5:59pm
Any of you guys have experience with jimmy rigging 79 yz125’s? I’m doing a winter rebuild and my petcock is leaking where it mounts up to the tank. It’s a plastic tank and instead of being flat where it mounts up, it’s caved in a bit. The old petcock has what looks like a piece of inner tube that someone used as a thicker gasket to help but it still seeps out. Any fixes for this or do I pretty much need a new tank? Is there any silicone type stuff that will be strong enough to resist gas? Also while I have it apart anyone have any tips or tricks to making it a better bike? Mods, jetting, all of that stuff. 200ft elevation in the PNW. Mostly Moto tracks. Thanks!
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Swarley814
Profile picture for user Swarley814
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Salem, OR, USA
Swarley814 1/3/2021 4:44pm
1/3/2021 4:44pm
Hard to tell from the pics, but the middle hole is the one that’s caved in a bit
JMCR250
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Chesterfield, MO, USA
JMCR250 1/3/2021 5:59pm
1/3/2021 5:59pm
Usually just replacing the o ring on the petcock will cure this. Give it a try -- they're cheap!
Swarley814
Profile picture for user Swarley814
Posts
39
Joined
4/17/2020
Location
Salem, OR, USA
Swarley814 1/3/2021 7:38pm
1/3/2021 7:38pm
JMCR250 wrote:
Usually just replacing the o ring on the petcock will cure this. Give it a try -- they're cheap!
It’s a brand new petcock and o ring. I thought that would fix it too lol

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