SL350 gas cap gasket
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Thread: SL350 gas cap gasket

  1. #1
    Member hondaka443's Avatar
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    SL350 gas cap gasket

    Hi guys i have a 1972 Sl350 K2 i got a new gas cap gasket/seal i cant get it on. the gasket has a groove in the middle that i think goes around the raised area on the vent mech. if the vent mech was removable it would be easy. so my question is the vent removable. thanks Ron

  2. #2
    Super Moderator Mydlyfkryzis's Avatar
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    Take a pic of the underside of the cap. My CB360 cap can can that disk pried out, and that makes it easy to replace the gasket. But I noticed not all caps are the same...they must of had different venders, even on the later ones.
    Richard

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    Member kcap122's Avatar
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    Yeah, if it's like the CB350 then it is difficult but not impossible to get the gasket on to the disk without removing the vent assembly.

    I did a blog post on replacing that gasket. I found that the easiest way to do it is to start by stretching the groove over the bottom accessible part of the vent disk near the latch, then holding that in place and slowly going around the disk with your fingers.

    SL350 gas cap gasket-2015-06-26-10.24.13.jpg
    Last edited by kcap122; 07-08-2015 at 11:18 AM. Reason: too many words

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  5. #4
    Member hondaka443's Avatar
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    thanks for the info. as my mother used to say patience is a virtue i finally got it started and used a very small screwdriver to lever the rest on like mounting a tire. thanks again Ron
    photoguy likes this.

  6. #5
    Super Moderator Mydlyfkryzis's Avatar
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    Look carefully, some of the caps have a square piece of steel holding the seal parts to the chrome cap. The 4 pointed corners of the square hold the seal parts in. You can see 2 of the point of the square in my pic. Using a small screwdriver, you can pry the points up and the seal parts come out. Easy then to replace the gasket, and it will snap back in.

    SL350 gas cap gasket-gas-cap-seal.jpg

    You can make out the left top point too, the left top point is barely visible.
    Richard

    Mydlyfkryzis = Mid Life Crisis
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  7. #6
    Member monomoit's Avatar
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    I'm replacing this gasket right now on a '72 CB350, and have removed the vent assembly from the cap housing. Here's a question: Is the gasket supposed to capture the floating "ring" at the top of the assembly (in addition to the main part of the body), or is it supposed to remain free outside of the gasket? Please advise, thanks!

    SL350 gas cap gasket-gascap.jpg

    In case there is any question, the "floating ring" is shown above...
    Last edited by monomoit; 03-31-2016 at 05:15 AM.
    1970 CL175 K4 Candy Sapphire Blue
    1970 CL350 K2 Candy Sapphire Blue
    1971 CL175 K5 Poppy Yellow Metallic
    1971 CL175 K5 Strato Blue Metallic
    1971 CL175 K5 Candy Topaz Orange
    1971 CB350 K3 Derby Green Metallic
    1971 CL350 K3 Candy Topaz Orange
    1973 CL175 K7 Turquoise Green Metallic
    2002 BMW R1150R Dakar Ferro
    (OK, this has GOT to stop...)

  8. #7
    Member monomoit's Avatar
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    OK, I was hoping to get a response, so... I'll try again! Can anyone clarify whether or not the floating ring in the fuel cap vent assembly shown above goes inside or outside of the rubber gasket?? Intuitively, it seems to me the answer is outside, since I can't see any reason otherwise for having this ring separate from the rest of the assembly. Hoping that someone can offer an explanation - thanks!!
    1970 CL175 K4 Candy Sapphire Blue
    1970 CL350 K2 Candy Sapphire Blue
    1971 CL175 K5 Poppy Yellow Metallic
    1971 CL175 K5 Strato Blue Metallic
    1971 CL175 K5 Candy Topaz Orange
    1971 CB350 K3 Derby Green Metallic
    1971 CL350 K3 Candy Topaz Orange
    1973 CL175 K7 Turquoise Green Metallic
    2002 BMW R1150R Dakar Ferro
    (OK, this has GOT to stop...)

  9. #8
    Junior Member Cafebiker60's Avatar
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    I just replaced mine on my CB360,and left the "floating" ring out of the assembly.Just for fun,I do have a cap which has a bolt in the center which comes out,so you can change the gasket quite easily!The only reason I didn't use it on my bike is that the chrome is pitted a bit much.

  10. #9
    Senior Member dtsmjr8dan's Avatar
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    I believe the rubber seal captures the two discs.
    1977 CB750 (acquired project)
    1979 CM400T (rider),
    1979 CM400T (resting)
    1980 CM400T (just picked up in pieces)
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (donor engine for 81)
    1982 CB450 (parts bike)
    1985 VT1100C (rider)

    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.

    Remember, today is the tomorrow we worried about yesterday.
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  11. #10
    Member monomoit's Avatar
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    So if the floating disc goes inside the gasket... what's the purpose of having it separate from the rest of the assembly?? That's the part that's puzzling me. Any thoughts?
    1970 CL175 K4 Candy Sapphire Blue
    1970 CL350 K2 Candy Sapphire Blue
    1971 CL175 K5 Poppy Yellow Metallic
    1971 CL175 K5 Strato Blue Metallic
    1971 CL175 K5 Candy Topaz Orange
    1971 CB350 K3 Derby Green Metallic
    1971 CL350 K3 Candy Topaz Orange
    1973 CL175 K7 Turquoise Green Metallic
    2002 BMW R1150R Dakar Ferro
    (OK, this has GOT to stop...)

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