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  1. #1

    HELP! Damaged nikasil on my GP1200R, Re-Plate or Re-Sleeve?? First re-build

    Hi, im new to this forum. thought id drop a post as im all out of ideas and need to ask someone who has been there and done that.

    Iv just started stripping down my 2001 gp1200r and its my first rebuild. I bought the ski last year for a really good price so dont mind chucking some money at it. The compression was getting low so thought its time to give it an overhaul. Its got 178 hours on it and from what i know and can tell this is the first time anything significant has been done to it from what i can see. Pistons have never been changed and the cylinder walls still have the nikasil on from stock. Thing is, theres a bit of a bad score in the middle cylinder and one of the others aint that great. I have been pricing up the cost of getting them re-nikasil but it aint cheap! Was wandering whether to go down the route of getting them re-plated as it does look like the best option, or get them re-sleeved with a steel sleeve? Just want to hear from some people who have been in the same situation and what there thoughts are??

    Also what aftermarket pistons would be best to put in, everything is standard size, cylinders are 80mm.

    Any help would be much appreciated

    Cheers Cameron


  2. #2
    powerstroke specialist mikegp's Avatar
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    can you feel the lines with your finger nails?
    also re plate them will be your best option but i will only re plate the one damage. i will not install anything besides Yamaha pistons . that's just me ,the other two , new pistons and rings

  3. #3
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    If gouged or can catch a fingernail is send off to millennium. Me i use pro x, oem is good too. Millennium will give you a discount if buy piston, rings, CIR clips, and wrist pin from them as well

  4. #4
    Thanks for the fast reply chaps.

    Yea theres one bad score on one of them which is pretty noticeable with your nail. One of the other cylinders has very light scores, can only just feel with your nail. there's also a change in colour on the walls of the cylinders but can still see the honing pattern through it. Looks like heat or something, all on the exhaust manifold side of the cylinder? If I could get away with just sending the two away then that would be handy. Thing is getting anything Re-Nikasil is pretty hard to come by where I live. I'm in the U.K. . The cheapest I've been quoted is £130 a cylinder. Think I'm just going to have to bight the bullet tho.

    Another thing I noticed on the outside wall of the cylinders was that two of them had a case stamp with "Y3" and one had "Y4" don't no if this is relevant but thought it would be worth mentioning. Cheers again guys.

  5. #5

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    You don't want to sleeve it if you are going to mod the motor. Sleeves don't dissipate heat well.

  6. #6
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by Cameron-Sangan View Post
    Thanks for the fast reply chaps.

    Yea theres one bad score on one of them which is pretty noticeable with your nail. One of the other cylinders has very light scores, can only just feel with your nail. there's also a change in colour on the walls of the cylinders but can still see the honing pattern through it. Looks like heat or something, all on the exhaust manifold side of the cylinder? If I could get away with just sending the two away then that would be handy. Thing is getting anything Re-Nikasil is pretty hard to come by where I live. I'm in the U.K. . The cheapest I've been quoted is £130 a cylinder. Think I'm just going to have to bight the bullet tho.

    Another thing I noticed on the outside wall of the cylinders was that two of them had a case stamp with "Y3" and one had "Y4" don't no if this is relevant but thought it would be worth mentioning. Cheers again guys.
    don't worried on the y numbers , there is one number stamp on top of the exhaust port by the pv,you will need that number if you are going to order oem pistons,if you get the piston from the same shop that its going to re plate the cylinder,they will know what to give you. [ ask ask ] just in case.
    130 is not bad,they cost lot more here in the states.

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