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Breather cap.

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Has anyone fitted a tank breather to an OSSA TR80 cap? Thoughts and details appreciated.

Tank and cap.jpg

I don't know anything about the TR80, specifically.  How does the tank vent currently?

At the risk of stating the obvious, drill and tap the fuel cap for a hose-barb fitting and install a vent with a one-way checkvalve like this:

https://www.ebay.com/itm/MOOSE-RACING-ALUMINUM-VENT-CAP-FUEL-HOSE-SMALL-ONE-WAY-VALVE-COLORS-ANODIZED-MX/232728408990?hash=item362fb1b39e:m:m8S6mTDXwRrxYJaRgZoaXUQ:rk:1:pf:0

One caution, I've found some of the Chinese copies may look like the above, but don't actually contain a checkvalve.

 

 

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