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Petrol tank cap seal material?

Posted: Fri Mar 22, 2019 5:47 pm
by 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

Re: Petrol tank cap seal material?

Posted: Fri Mar 22, 2019 6:07 pm
by charles.bulloch
If it is a 55 tank an MZ TS 250 cap seal fits and is easily available.

Re: Petrol tank cap seal material?

Posted: Fri Mar 22, 2019 7:00 pm
by roger.fellows
Ask Steve Carter!

Re: Petrol tank cap seal material?

Posted: Fri Mar 22, 2019 7:32 pm
by bevanclark
I've made them successfully out of a piece of old leather. Cheers, Bevan

Re: Petrol tank cap seal material?

Posted: Sat Mar 23, 2019 7:26 am
by adrie.degraaff
"ALI" has has blades of cork made of a single cut with no bounding material.

Re: Petrol tank cap seal material?

Posted: Sat Mar 23, 2019 8:01 am
by pappleton
Hi Adrie,
I'm having a 'dim' moment. Tell me more about this ALI of which you speak.
BR, Paul

Re: Petrol tank cap seal material?

Posted: Sat Mar 23, 2019 8:56 am
by robjameson
Cork works and is available in pre made gaskets from eBay etc.

Re: Petrol tank cap seal material?

Posted: Sat Mar 23, 2019 10:07 am
by adrie.degraaff
You need a blade of cork becouse the bounding material of the ebay things cann't stand modern petrol.
aliexpress or alibaba.

Re: Petrol tank cap seal material?

Posted: Sun Mar 24, 2019 8:42 pm
by 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.

Re: Petrol tank cap seal material?

Posted: Mon Mar 25, 2019 3:56 pm
by 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 :-)