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General Category >> Rubber Side Down! >> Fuel cap anatomy help
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Message started by Tocsik on 03/26/26 at 17:26:22

Title: Fuel cap anatomy help
Post by Tocsik on 03/26/26 at 17:26:22

Fuel cap has been leaking so my first step was to flip over the existing gasket and get some measurements while it was out. I really thought I was being careful, but when I went to pick up the internal cover for the locking mechanism to reassemble, a spring and one of the retractable latch pins had dislodged. And an interesting washer with a small hole that doesn't appear to align perfectly with anything, no matter how it's positioned.

Man, there's a lot of parts in there!

I worked with it a bit, trial and error, and I think I have it back together correctly, but would really like to be sure.

Anyone have detailed pics of how these things are assembled?

Title: Re: Fuel cap anatomy help
Post by Ruttly on 03/27/26 at 10:48:43

2 different caps , both fit tight ,one won’t fit the other just a tad bigger. It may be a California only cap. One breathes better than the other. Never force it in cause it’s almost impossible to remove. It’s been awhile , I remember replacing the seal and changing something from old cap to new cap. After that the bike ran better at WOT , and using the deep well nut on the float bowl gave a very linear pull off of idle to WOT. For not having a bigger cam she really gets with it making power, might be my best jetting yet. I love Big singles.

Title: Re: Fuel cap anatomy help
Post by Tocsik on 03/28/26 at 05:49:28

Also, I've always had to use the key to reinsert the cap on the tank. Just wanted to be sure that's how they all work. Should the retractable latches spring inward without the key, so you can just press it back on, sans key?

Not a CA bike. No charcoal canister. I can hear the ball bearing moving freely in the vent when I invert the cap.

Thx.