What size Allen socket bolt for "Factory head pipe to exhaust manifold
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  1. #1
    I dream skis GASSEM's Avatar
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    What size Allen socket bolt for "Factory head pipe to exhaust manifold

    Like the title says
    what size bolt
    length
    metric ?
    diameter
    i think it's course
    thanks Jeff
    There is a very fine line between 'hobby' and mental illness.

  2. #2
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    M10 1.25, not sure on the length, but one of the longer yamaha case bolts works great.
    Last edited by KirkMN; 06-18-2017 at 03:54 PM.

  3. #3
    Top Dog octane114's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    Rad dudes sale them
    it is what it is . it's all good

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    PWCToday.com Is My Home Away From Home freekstyle's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold


  5. #5
    PWCToday.com Is My Home Away From Home Bruce in SB's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    Hard to find locally in SS.
    "Thanks" to Chris Newmiller @ Newmiller Machine

  6. #6
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    Fastenal.com has the for around $5 each. M10x1.25x50mm long.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  7. #7
    Resident Guru still standin's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    Quote Originally Posted by BLRider View Post
    Fastenal.com has the for around $5 each. M10x1.25x50mm long.
    BL did you see these in Stainless on Fastenal? couldn't find them in SS.

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  8. #8
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    I purchased mine from them, about 4 years ago.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  9. #9
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    For anyone interested, the stock bolts that attach the headpipe to the manifold on the Kawi 650's ( sx, x2, etc) are the correct length (50mm) to use with the Kawasaki Factory Pipe head pipe. The bolts are still available from Kawasaki under part number 92150-3819 and they are $7-$8 a piece. They are strong, stainless, and already have thread locking compound on them.
    If you have a Yamaha version of the Factory Pipe head pipe you will need bolts that are 10mm shorter (40mm).
    Again, as someone mentioned, rad dudes offer nice stainless bolts as well.

  10. #10
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: What size Allen socket bolt for "Factory head pipe to exhaust manifold

    The 1.25 is a JIS standard (fine pitch) thread. It's hard to find stainless in the US. I did a ton of searching and found a place that had stainless socket head ones a while back for about $5 each. I just checked Fastenal and don't see any, who knows they may be hard/ rare to keep in stock. I have bought black oxide coated steel ones from McMaster, they have them for $6-6.50 for 10 depending on if they're 40 or 50mm.

    Keihin42, are you sure the oem ones are stainless? The ones I have seen would appear to be coated alloy steel if I had to guess.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
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