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  1. #1
    PWCToday Newbie
    Join Date
    Jan 2018
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    FL
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    Gaskets dry or ? during 89 650sx rebuild?

    I searched and found a lot of info but since opinions change over time I thought this would be the place to ask. The engine is fully apart and all new gaskets are being installed. I am using 3 Bond on the cases but should I use a sealant, copper spray, dressing, go dry or ? on the following gaskets/seals:

    -Crank seal grooves in cases
    -Cylinder to base
    -Cylinder cover
    -Carb base
    -Intake manifold to Reeds and Reeds to cylinder
    -Cylinder to exhaust manifold
    -Exhaust manifold to pipe
    (And any I am missing!)
    Thanks for any help

  2. #2
    Top Dog bandit88's Avatar
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    Green Bay WI
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    Re: Gaskets dry or ? during 89 650sx rebuild?

    -Crank seal grooves in cases - I only put a dab of 3bond where the case halves meet, otherwise outer seal is dry
    -Cylinder to base - Install dry, I coat with grease to make removal easier in the future
    -Cylinder cover - Oring, I grease, dry is fine
    -Carb base - dry
    -Intake manifold to Reeds and Reeds to cylinder - dry
    -Cylinder to exhaust manifold - dry
    -Exhaust manifold to pipe - dry
    -95 750SXI
    -86 440 with PJS800 conversion - http://www.pwctoday.com/showthread.php?t=466927
    -90 TS650
    -91 300SX

  3. #3
    PWCToday Newbie
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    Re: Gaskets dry or ? during 89 650sx rebuild?

    Thank you Bandit88. When you refererence the o ring is that the rubber coated-looking flat cylinder head gasket? And as far as greasing is that just some marine grease thin coated on both sides?

  4. #4
    Top Dog bandit88's Avatar
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    Re: Gaskets dry or ? during 89 650sx rebuild?

    the Oring I was talking about is the one that goes between the crankcases and flywheel cover. As for the grease, I just use some trailer bearing grease or whatever I have around. Just a very thin layer, doesnt need to be gobbed up or anything.
    -95 750SXI
    -86 440 with PJS800 conversion - http://www.pwctoday.com/showthread.php?t=466927
    -90 TS650
    -91 300SX

  5. #5
    PWCToday Newbie
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    Jan 2018
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    FL
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    Re: Gaskets dry or ? during 89 650sx rebuild?

    Anyone have input on the cylinder head gasket(flat seems to metallic with a thin rubbery coating). Thanks

  6. #6
    Top Dog bandit88's Avatar
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    Re: Gaskets dry or ? during 89 650sx rebuild?

    That goes on dry. The black coating is a type of sealant.
    -95 750SXI
    -86 440 with PJS800 conversion - http://www.pwctoday.com/showthread.php?t=466927
    -90 TS650
    -91 300SX

  7. #7
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: Gaskets dry or ? during 89 650sx rebuild?

    Quote Originally Posted by bandit88 View Post
    the Oring I was talking about is the one that goes between the crankcases and flywheel cover. As for the grease, I just use some trailer bearing grease or whatever I have around. Just a very thin layer, doesnt need to be gobbed up or anything.
    Only use silicone grease on o-rings. Other greases may make it swell.

    Chester
    Speed is very expensive. How fast do you want to spend?

    Stand up:
    98 SXi-Pro

    Couches:

    96 XP
    86 X2

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