Fuel Petcock

[NickB]

I removed the Petcock to clean the tank out and used a little gasket maker to seal it up but its leaking. Whats the best plan of action to get this to seal I can't find the fiber gaskets that were on there will the o-ring seal it up with out one? It looks to be seeping around the edges.

 

[OHRider]

Try copper washers.

 

[TwoManyXS1Bs]

.. used a little gasket maker to seal it up...

The "gasket makers" I've seen are all variations of silicone seal.

*AVOID* using any form of silicone seal around gasoline...

 

[NickB]

I used a gasoline rated one but it didn't work these are the 1975 oval petcocks i am thinking of buying a sheet of fiber board gasket and cutting it to fit.

 

[lakeview]

Don't forget that the mounting screws need fiber gaskets on them too.

 

[Paul Sutton]

Around the screws I had bad luck with fibre washers from a hardware store. They were probably just rated for water. I managed to buy some fibre washers rated for gas and fuel and these work extremely well. If you buy some fibre board gasket just check it is rated for fuel.

 

[5twins]

Yamaha still sells the sealing washers for the petcock mounting screws .....

https://www.partzilla.com/product/yamaha/90202-05187-00?ref=285461b180c74b38428a56a1f271ef6c00fd8dfc

 

[NickB]

Thanks for the help I didn't have anything on the screws at all so I will add that and see if I can find a rating on the fiber board but in the reviews they said it was used on a lawn tractor carb with no issues.

 

[Grimly]

If you get stuck without the proper sealing washers, you can use a simple plain washer and smear it both sides (and the bolt head) with blue Hylomar.
It won't leak. It's not silicone based, and is unaffected by petrol.

 

[Tucker Moon]

I am also having issues with fiber washers leaking. This should be a simple repair. I have tried three different mikes washer kits and they still leak I cannot find the washers anywhere else to try something different. I have tried copper washers and still leak. what can I do to resolve this? I must be doing something incorrect after replacing them three times. I have tried snug pressure to full blown over torque with no success. Please help

 

[5twins]

I suggest getting genuine Yamaha washers (see post #7) instead of the MikesXS junk.