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  1. #1
    Rocky_Road's Avatar
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    Intake grate bolt size?

    My stock grate on my MSX 150 used a metric bolt (grate was recessed for the head to flush out)...but my R&D seems to be chamfered for a oval head screw.

    Does anyone know the particulars of the original bolt? As it stands now, the bolt head sits below the grate plane...and I would like to change it for a flush application.

    Or will it even matter that the head of the bolt is in the water path...?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Rocky_Road View Post
    My stock grate on my MSX 150 used a metric bolt (grate was recessed for the head to flush out)...but my R&D seems to be chamfered for a oval head screw.

    Does anyone know the particulars of the original bolt? As it stands now, the bolt head sits below the grate plane...and I would like to change it for a flush application.

    Or will it even matter that the head of the bolt is in the water path...?
    I just changed the intake grate on my MSX 140, and I also need to replace the hex head bolt with a flush style. The bolt head will affect the water flow. Not sure how much, but it can't be helping.

    The non-MSX hulls used a smaller thread, tapered oval head screw (non-Metric, I think).

    For the aftermarket intake grate on the MSX hull, you need an 8MM metric thread, about 1 1/4" long (measure your old bolt), Oval or Flat head.

    Torque to 8ft-lbs, with Locktite 242 or 248

  3. #3
    Rocky_Road's Avatar
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    Thanks, K447!

    Can't find locally...got any?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Rocky_Road View Post
    Can't find locally...got any?
    When I find them (just haven't gone shopping for it yet), I will buy a few extra, and send one to you.

  5. #5
    Rocky_Road's Avatar
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    Quote Originally Posted by K447 View Post
    When I find them (just haven't gone shopping for it yet), I will buy a few extra, and send one to you.
    You the man...K447!

    Just got back from running the R&D grate...look for my new post.

  6. #6
    Rocky_Road's Avatar
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    Quote Originally Posted by K447 View Post
    When I find them (just haven't gone shopping for it yet), I will buy a few extra, and send one to you.
    I've got a package of 10 shipping today...I'll get you one, when I get them!

    Went with the 316 stainless steel, 5mm hex head, flat head screw.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Rocky_Road View Post
    I've got a package of 10 shipping today...
    What did you order - flat or oval head?
    Hex drive?

  8. #8
    Rocky_Road's Avatar
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    Quote Originally Posted by K447 View Post
    What did you order - flat or oval head?
    Hex drive?
    flat head, hex drive (5mm), 1.25" length, 316 S.S. (supposed to be the best stainless grade). Seems like half the engine bolts are 5mm hex, and there was even a 5mm hex tool in the tool kit. I use several different hex drives that I got from Snap-On, so I am not concerned about rounding off the heads.
    Last edited by Rocky_Road; 08-20-2008 at 06:08 PM.

  9. #9
    Quote Originally Posted by Rocky_Road View Post
    flat head, hex drive (5mm), 1.25" length, 316 S.S. (supposed to be the best stainless grade). Seems like half the engine bolts are 5mm hex, and there was even a 5mm hex tool in the tool kit. I use several different hex drives that I got from Snap-On, so I am not concerned about rounding off the heads.

    We use a Button Head/Hex Head so water flow is smooth over top, and it does not oxidize in the grate so we cant remove it

  10. #10
    Rocky_Road's Avatar
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    Quote Originally Posted by prochamp View Post
    We use a Button Head/Hex Head so water flow is smooth over top, and it does not oxidize in the grate so we cant remove it
    Thanks for confirming my final choice!

    Sometimes it's the small details that make the biggest differences....


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