Questionable tankcap vent

[George R. Young]

Sunday morning before-breakfast ride, bike comes to a halt after about 7 km. It's just onto reserve but there is surely gas in there. Wouldn't start until I opened the cap, then all was well, filled up, rode home.

Found a good write-up on vent valve removal:
http://forum.cog-online.org/index.php?topic=60228.msg466823#msg466823
and deleted the lower little valve.

[DC Concours]

Did you do that mod on your bike now too?

Sunday morning before-breakfast ride, bike comes to a halt after about 7 km. It's just onto reserve but there is surely gas in there. Wouldn't start until I opened the cap, then all was well, filled up, rode home.

Found a good write-up on vent valve removal:
http://forum.cog-online.org/index.php?topic=60228.msg466823#msg466823
and deleted the lower little valve.

[George R. Young]

Yes, I pulled out the lower valve and chucked it in the trash. It appears to control air entering the tank and it wouldn't let enough air in when the gas level was low.

[MAN OF BLUES]

While that does work, just be mindfull when hosing down the bike, or when it torrential rain on it while hot...
The valves purpose was to allow venting, but to also prevent ingress of water at the same time... soooo, that is the downside.

I've always ran with a tank bag covering the filler, so never had the issue, but never had a malfunction of the valve on either of my C10's.