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  1. #1

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    Will cracked exhaust manifold cause inaccurate compression readings?

    Going to check out an '03 1300 with what the owner says is a cracked exhaust manifold. I assume that this will affect the compression check because it'll lose some back pressure. How do I check this thing out?

    Thanks.


  2. #2
    it shouldnt the piston will be blocking the exhaust ports when its compressing at the top. If it didnt you wouldnt have any compression at all.

  3. #3
    zx11rider's Avatar
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    +1 If the compression is off you got other problems with the motor. A cracked exhaust manifold will make the ski lose rpms but compression should be fine.

  4. #4
    philip_gpr's Avatar
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    if it turns out you need an exhaust manifold I have several

    if you can't actually see the crack

    if in fact it is cracked and leaking exhaust it will have a gdll grey dirty coating on everything in the vicinity

    you should also try running it on a hose to see if there is a water leak

  5. #5

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    What would cause the exhaust manifold to crack? I have a gp1200r that ran great all last season and then one day I took it out and it was very very sluggish on mid to top end. I opened it up and saw water spraying from a crack in the manifold.

  6. #6
    L Carlson's Avatar
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    Quote Originally Posted by maxxx22 View Post
    What would cause the exhaust manifold to crack? I have a gp1200r that ran great all last season and then one day I took it out and it was very very sluggish on mid to top end. I opened it up and saw water spraying from a crack in the manifold.
    Where is the crack on the manifold? I might just have and extra one in the shop. Lee

  7. #7
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    a cracked manifold will not cause low compression.

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