Petrol tank cap seal material?

[Graham.Goral]

Hi folks,

My Huntmaster petrol cap has a slight leak and, on inspection, the original seal is hard and cracked. What material is best to make a replacement please? I know normal rubber will not withstand petrol. Neoprene? Silicone rubber sheet?

Suggestions please?

Cheers, Graham

[charles.bulloch]

If it is a 55 tank an MZ TS 250 cap seal fits and is easily available.

[roger.fellows]

Ask Steve Carter!

[bevanclark]

I've made them successfully out of a piece of old leather. Cheers, Bevan

[adrie.degraaff]

"ALI" has has blades of cork made of a single cut with no bounding material.

[pappleton]

Hi Adrie,
I'm having a 'dim' moment. Tell me more about this ALI of which you speak.
BR, Paul

[robjameson]

Cork works and is available in pre made gaskets from eBay etc.

[adrie.degraaff]

You need a blade of cork becouse the bounding material of the ebay things cann't stand modern petrol.
aliexpress or alibaba.

[KenGriggs]

Viton rubber sheet is available. Cut a new ring of this using the original cork one as a template. Viton rubber is resistant to ethanol, whereas cork will eventually disintegrate in contact with ethanol in fuel. Google it.

[Graham.Goral]

Thanks guys! Will investigate the MZ tank cap seal first but mine's a '56 bike so I need to check if the '55 and 56 tank caps differ. If so then I'll look at Viton sheet, as I've had cork ones on other bikes which have not lasted very long. Thanks for all the help