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  1. #1

    2001 Polaris Genesis - Piston fried...Need Advice?!

    I finally got the thing up and running last season, and right at the end of the season I suddenly lost power on the water. Almost full throttle, I barely putted along back to the boat ramp. It felt like i was dragging a piston, and sure enough... See the pictures below. I have 2 questions------->

    (1) Do I need to replace this cylinder head, or can I sand it smooth and continue to use it (as long as there is no warpage)?
    (2) What course of action would you guys suggest to fix this cylinder? It is damaged (grooves scratched in from the piston) Should I replace the cylinder and piston, or should I bore it bigger? Also, if I bore it bigger, wouldn't i need to bore the other 2 cylinders also? I am looking for the most cost-efficient solution. I was going to replace the cylinder and piston, and replace the rings on the other 2 cylinders while im down there. If I took this route, would you suggest honing the other 2 cylinders?

    Compression is:
    Front cylinder - 95 psi
    Middle cylinder - 0 psi
    Rear cylinder - 78 psi

    Thanks!
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  2. #2
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    You could bore that cylinder and get a new piston. With those numbers, I would bore all 3 and replace the pistons. I would have serious concerns about the condition of the crank after seeing those pics. You may very well be looking at a full rebuild. At least if it were my motor thats what I would be doing. Am I correct in assuming this is a DI motor? That cylinder head is junk. Replace it.

  3. #3
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    Last edited by chc3; 01-12-2015 at 10:04 PM.

  4. #4
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    Quote Originally Posted by chc3 View Post
    Hello just buy the piston kit:
    http://www.ebay.com/itm/POLARIS-1200-WSM-Platinum-Piston-Top-End-Rebuild-Kit-/120438786053?pt=Personal_Watercraft_Parts&hash=ite m1c0ab60805&vxp=mtr
    Bore and buy one used head off ebay and put it back together.
    You should have about $400 invested in rebuilt engine


    It will be more than 400. 60 bucks a cylinder is the going rate for cylinder boring last I checked. You will be around 500 and thats if your crank is ok.

  5. #5
    Connecticut CrazyA's Avatar
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    With all due respect, rebuilding that engine without a teardown and crank inspection is just plain insane. Look at that carnage.......
    With that amount of damage there is no way you got lucky enough to have ALL the debri exit through the exhaust, not to mention the pounding that center assembly took.

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  7. #6
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    Ok
    Last edited by chc3; 03-08-2014 at 09:56 AM.

  8. #7
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    Quote Originally Posted by chc3 View Post
    Ok people $500 for a top end job is all he needs yes you can do a total tear town but why these are tough motors i did one just like that last year i hosed out the engine with water in the ski to get out the debris out then siphon out the water put some oil on everything all good then. Then installed the top end i just hone the cylinders they still had bad spots did not care and been running the shit out of that ski since. 127 130 132 today
    You may be the luckiest man alive.
    Last edited by K447; 03-07-2014 at 08:59 PM.

  9. #8
    Connecticut CrazyA's Avatar
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    Quote Originally Posted by chc3 View Post
    Ok people $500 for a top end job is all he needs yes you can do a total tear town but why these are tough motors i did one just like that last year i hosed out the engine with water in the ski to get out the debris out then siphon out the water put some oil on everything all good then. Then installed the top end i just hone the cylinders they still had bad spots did not care and been running the shit out of that ski since. 127 130 132 today
    While what you say may be true, I would be very hesitant, personally, to give that kind of advice to someone coming on here and asking for help. I would have to say that your story is the exception and not the rule.
    Last edited by CrazyA; 03-08-2014 at 12:25 PM.

  10. #9
    COOL SUMABITCH
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    Dude I will sell u a complete motor for 600.00 I have about 10 of them.injected or carved.u don't think any of that metal makes it into the cranks bearing.if u don't tear it down and inspect crank.u are crazy.9times out of 10 the crank is out of deflection.is what caused it.no matter how many times u rebuild or u will end up in the same boat.the people on here that are telling u to just put it back together arnt spending yourmoney.and probably ddone know there ass from there chin

  11. #10
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    Quote Originally Posted by aussinole View Post
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    You can clearly see the wrist pin roller bearings imbedded in the piston. Those bearings ride inside the connecting rod and it will need to be replaced-since the rod is pressed onto the crank shaft-the crank shaft needs to be rebuilt.
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