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Gas cap vent

13 Jul 2020 14:35
wayno
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Gas cap vent #1
Another small problem, seem to have a fuel issue when using the bike on the road, appears it's not getting enough fuel. Stripped the gas cap to try and clean the vent, where does it vent out to? Is it within the key slot?

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13 Jul 2020 16:22
MarkT
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Gas cap vent #2
Year, model, and pictures are always helpful (to others that might have the same problem and to get your question answered)

I've never seen a Yamaha cap that vents to the key.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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13 Jul 2020 19:03 13 Jul 2020 21:41 by MarkT. Reason: insert photo
wayno
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Gas cap vent #3
It's a 76 dt400, only pic I have at the moment isn't really clear, can see the groove for the vent that travels around under the seal and ends in a hole into the cap, where does it vent out to?

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13 Jul 2020 22:04
MarkT
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Gas cap vent #4
I don't have a new cap of that style handy... thought you might have a "flip top" type.

Most of the time that style cap vents around the edge where it crimps. Here's a new early cap where you can see how it vents all the way around.



All I can suggest is trying to blow high pressure air into the vent hole and see if you can clear the blockage and/or tell where it vents?

The early non-locking cap should fit too if you want to replace it with something for now... auto parts might have something too... I used a vented Stant cap from NAPA on one years ago, parts guy matched it up, Yamaha wasn't listed. It fit good and used it for years. Just know that many auto caps are not vented if you go that route.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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14 Jul 2020 03:37
wayno
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Gas cap vent #5
probably is venting around the edge of the cap, tried blowing air into it but so much air into such a small hole blows everywhere so cannot tell.

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14 Jul 2020 06:04
wayno
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Gas cap vent #6
left it soak in a bit of wd40, blew air gain, is venting around the cap, got a face full....
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14 Jul 2020 07:50
Gr8uncleal
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Gas cap vent #7

wayno wrote: left it soak in a bit of wd40, blew air gain, is venting around the cap, got a face full....


That's good, yes?! :Excited

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14 Jul 2020 18:35
wayno
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Gas cap vent #8
No danger of rusting now, quick question,the bar from the rear brake switch, does it route between the swinging arm and engine case or the wheel side of the arm, mine is a bit mangled be do cannot work it out.

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15 Jul 2020 00:24
Gr8uncleal
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Gas cap vent #9
Morning Wayne.

CMSNL indicates that your 400 is the same as my 360, so here are some photos of mine - I hope that they help.

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15 Jul 2020 03:27
wayno
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Gas cap vent #10
thanks mate, that's perfect. gonna try and reshape mine or maybe make one.

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