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  1. #1
    Chine Walker
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    Look what I found when pulling the head??!!

    78hrs, good compression (121, 120 & 118, but when I pulled the head to swap it for a cut one, I found this nasty wear mark on the wall of cyl. 3. The wear pattern surrounds the PV port; and seems to start at the base of the ports. The odd thing is the compression hasn't changed from the day I got it with 29 hrs, and no metal was found. When you run your finger over the area you barely feel anything; it just looks nasty. I tried muriatic acid on a q-tip on a small area and it seemed to remove some of it, but you could still feel something on the surface.
    Any thoughts???

    jp
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    Last edited by jpa1300; 06-16-2008 at 06:45 PM.


  2. #2
    Nothin' runs like a Deere IowanGPR's Avatar
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    the port may have had a machining issue? I can't see that getting better with time. any idea how long that has been visible?

  3. #3

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    yeah pull that jug and look at that piston, looks like a light seizure. If it is and you keep running it it will come apart.

  4. #4
    Chine Walker
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    I just found it last w/e when swapping out the head; can't say how long it's been there. If I pull the jug; is it possible to clean the walls and install a new piston & rings?

    Coming apart would mean catstrophic failure, right??

  5. #5

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    Is it me or is that a sbt cylinder? Kinda looks cracked from exhaust to transferport.

    Either way pull it now. It wont get better with time.

  6. #6
    txgp1300r's Avatar
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    What I would do is pull all jugs and wash the surface with muriatic acid to eat all the aluminum deposits off cyl wall...i would then get my stone hone ( dont use a bead hone ,it will screw up ports) get some 320 wet/dry sand paper and spray it down with wd40 or mineral spirits and hone the bore till its smooth using up and down stroke to get a 45 deg cross hatch pattern...if you find any cracks or deep deep grooves you will need to go to plan B...if bores hone out good put in new pistons and new rings....make sure to put rings 1 inch down and check the gap...by the way you cylinders look better than mine when i tore it down, I did the above and my ski is running great.

  7. #7
    Chine Walker
    Join Date
    Nov 2006
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    txgp,
    It's only one cyl. that has this; it's cyl. 3. I posted 3 pics to show different angles.

  8. #8
    Moderator RX951's Avatar
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    looks like it has been slightly "squeaked"....how does your piston wash look on the other two?

  9. #9
    txgp1300r's Avatar
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    Quote Originally Posted by jpa1300 View Post
    txgp,
    It's only one cyl. that has this; it's cyl. 3. I posted 3 pics to show different angles.
    then just do it to that cylinder.......if you were in dfw I would help you

  10. #10
    Moderator OsideBill's Avatar
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    Quote Originally Posted by RX951 View Post
    looks like it has been slightly "squeaked"....how does your piston wash look on the other two?
    Yep I agree I bet that piston skirt looks just as good. get the jug off it may be salvaged, you will need a new piston for sure.

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