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  #16 (permalink)  
Old 05-03-2015, 01:59 PM
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Absolutely. I'm going to seek out a machine shop to do it to my cap.
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  #17 (permalink)  
Old 05-04-2015, 02:07 PM
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I have the same cap missing the gasket.So Im watching this.
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  #18 (permalink)  
Old 05-05-2015, 02:46 PM
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Quote:
Originally Posted by jedi View Post
I fixed mine by machining an "o" ring groove in the cap. Choose the right size rubber o-ring to suit.
It doesn't rattle and it doesn't leak.
Any chance I could persuade you to take another shot of the cap w/ the O-ring on it? Just curious to the thickness of the O-ring you're using.
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  #19 (permalink)  
Old 05-07-2015, 12:12 AM
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Quote:
Originally Posted by Oldschoolpaulie View Post
Any chance I could persuade you to take another shot of the cap w/ the O-ring on it? Just curious to the thickness of the O-ring you're using.
The O ring I have is reasonably thick as mine parks itself at the beginning of the mouth of the tank which it doesn't have to as a thinner one would allow it to seal deeper inside .
I left mine thicker as such because it works well as it was and position didn't bother me.

If you end up with a perfect seal you'll need to either drill a small hole thru the cap to one side or a poor mans way would be to make a small nick in the O ring to let it vent.
Otherwise you end up with a vacuum situation and fuel won't flow after a time.
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  #20 (permalink)  
Old 05-07-2015, 02:04 AM
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Quote:
Originally Posted by jedi View Post
The O ring I have is reasonably thick as mine parks itself at the beginning of the mouth of the tank which it doesn't have to as a thinner one would allow it to seal deeper inside .
I left mine thicker as such because it works well as it was and position didn't bother me.

If you end up with a perfect seal you'll need to either drill a small hole thru the cap to one side or a poor mans way would be to make a small nick in the O ring to let it vent.
Otherwise you end up with a vacuum situation and fuel won't flow after a time.
But these are vented? I can blow air through mine from the back side.
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  #21 (permalink)  
Old 05-07-2015, 03:19 AM
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Quote:
Originally Posted by Oldschoolpaulie View Post
But these are vented? I can blow air through mine from the back side.
Of course you can because the air vents thru two holes at the base and then up thru the plastic thread and passes the knurled cap because it doesn't make contact with the tank mouth.

If you then seal the mouth with the knurled cap with an O ring the air has no way of getting past anymore so you need to fix the situation.
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  #22 (permalink)  
Old 05-07-2015, 05:27 AM
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Where did you drill yours?
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  #23 (permalink)  
Old 05-14-2015, 06:06 PM
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had the same issue with a west coast chopper gas cap it was vented but on the bike the cap screwed into a neck (like frenched ) or molded around where the cap screws the thick gasket sealed it to tight, causing the bike to run then about ten feet die. mine would piss gas out the carb if I parked it in the sun, park it in the sun for 20 minutes then un screw the cap and see if it has pressure. you will hear it when you open it, like opening a bottle of soda I drilled 4 holes in the gasket with micro bits and it was fine I did run it with the gasket off it rattled bad so I figured it sealed to tight, off the bike you can blow into the bottom of the cap and feel the fent was operational it just sealed to tight just my 2 cents that worked for me
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Old 05-15-2015, 08:08 AM
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Jedi, Portal, which company manufacturers your cap?

Last edited by Oldschoolpaulie; 05-15-2015 at 08:11 AM..
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  #25 (permalink)  
Old 05-15-2015, 12:26 PM
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Quote:
Originally Posted by Oldschoolpaulie View Post
Jedi, Portal, which company manufacturers your cap?
Mine's WCC
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  #26 (permalink)  
Old 05-15-2015, 09:36 PM
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Quote:
Originally Posted by Oldschoolpaulie View Post
Some pics:
If you want my extra WCC villain cap get ahold of me . I did not use either and went with Speed Dealer customs Villain replacement cap and their bung . They say their cap won't leak and even works better with their bung . Speed Dealer cap on left , WCC cap on right
Also if you call and talk to Frank he can make anything . He made me a couple one off pieces for my CFL and was reasonably priced . You can change the pop up cap real easy just take the screws out of the bottom of your cap and then switch your top with the Maltese cross
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  #27 (permalink)  
Old 06-12-2015, 09:15 PM
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Quote:
Originally Posted by jondle1 View Post
If you want my extra WCC villain cap get ahold of me . I did not use either and went with Speed Dealer customs Villain replacement cap and their bung . They say their cap won't leak and even works better with their bung . Speed Dealer cap on left , WCC cap on right
Also if you call and talk to Frank he can make anything . He made me a couple one off pieces for my CFL and was reasonably priced . You can change the pop up cap real easy just take the screws out of the bottom of your cap and then switch your top with the Maltese cross
Well, my brother gave me a simple O ring to try, and surprisingly, it somehow has solved the problem entirely. I took it to a local shop that does work on bikes and has a machine shop. I showed them to pic you uploaded, and they said they could do it. I told them the O-ring I swapped for the flat washer-style gasket had been working, but I was concerne that it was causing my fuel pump to work over time since it might not be properly venting now. He put his compressed air fitting on his line and fiddled w/ the vent cross-cuts, and handed it back to me. He said it looked like I had it "beaten," and that the air was venting under the knurled cap, so I was good. Pretty simple fix.
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  #28 (permalink)  
Old 10-24-2015, 05:06 PM
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had the same issue with rattle. had me hanging all over the bike going down the road trying to pin point. fixed the rattle with a tight once around the cap with black tape. that was last year..no desolved tape or mush. o-ring sounds like a good winter do.
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Old 10-25-2015, 05:38 AM
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may not work on every gas cap in the world but I have had great results in the past by making the seals out of Leather.... dont leak or rot, easy to make and cheap to make a 1000 of them if ya want................
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Old 11-06-2015, 07:45 PM
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Frank at Speed Dealer is a solid guy, he'll make ya whatever ya need.
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