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  1. #1
    Join Date
    Aug 2009
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    Sydney, NSW, Australia
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    Default $450-$500 to resleeve this cylinder?

    Hey guys i have a basic modern dirt bike engine im rebuilding the engine thru a rod and totalled the engine, i am looking at all options on the cylinder buying oem, aftermarket, nikasil recoat or even resleeving

    I have been looking at cost and everyone seems to use nikasil coating which is over $400 i called one shop and asked about a resleeve from memory was quoted $450 plus postage cost

    A new aftermarket cylinder is $330 but its a cheapy likely chinese nikasil coating

    What should i pay to get a resleeve like in this video if i had a bigger lathe i would have done it me self

    https://youtu.be/y9GF4lfAIJ8

  2. #2
    Join Date
    Aug 2011
    Location
    Perth, Western Australia
    Age
    67
    Posts
    362

    Default

    With a thrown rod I would have thought a cylinder re-sleeve would be the least of your problems.

    With the $450 were they making the sleeve? If so its probably a good price but its 15 years since I played with bikes.

    My brother sends his cylinders to New Zealand to be nikasil coated. He would be happy at $400 per cylinder.

    Not much help, Tony.

  3. #3
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    Aug 2009
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    Sydney, NSW, Australia
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    Default

    Hey Tony, when i purchased the bike i assumed the cylinder would have survived she took out both crankcases, crank, balance shaft, and cylinder i budgetted for everything but the cylinder the rod had broken the skirt it can be welded but than needs machining and nikasil coating

    By good chance i found a bloke on facebook with a project that went pear shaped and he had a bottom end that was just rebuilt and ran low on oil for the innitial start up and it semi seized the big end rod bearing so the guy was trying to sell the whole bottom end, i seen the bottom end was listed over a week ago so i went in with the boot and offer of $200 was acepted

    I got the new bottom end tore down and pressed the crank apart the other day she took all of 20 tons to hear the crank pin creak and see it move

    Without knowing the condition of the cylinder it was only going to cost about $400 for a rebuild but once torn apart the damaged cylinder is throwing a bit more dough into the project

    I was on youtube earlier and seen guys boring there cylinders attached to the lathes cross slide with a bar/ boring bar attached from the chuck thru to the dead center that is an idea

  4. #4
    Join Date
    Aug 2011
    Location
    Perth, Western Australia
    Age
    67
    Posts
    362

    Default

    This "basic modern dirt bike engine" you speak of is it water cooled? If so it may not be able to be sleeved. Not enough meat on the cylinder to be bored and sleeved. Have you checked.

    Tony

  5. #5
    Join Date
    Jun 2005
    Location
    Helensburgh
    Posts
    618

    Default

    You get what you pay for when rehabbing cylinders. We used to send them to NZ years ago but I haven't done one for a long time and towards the end of our racing NZ quality had dropped and they were going to the US. Any kart shop would be able to give you up to date advice but Nikasil costs what it costs and preparation is everything
    CHRIS

  6. #6
    Join Date
    Aug 2009
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    Sydney, NSW, Australia
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    Default

    The bike is a YZ250F 2005yeah there are two sleeve companies that make the sleeves one is WISECO the other is L.A Sleeves the second one is available in Aus to purchase at $135 that is why i cant work out why a shop would charge $450

    I may see if my cylinder fits on my lathe

  7. #7
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    Aug 2009
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    Sydney, NSW, Australia
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    Default

    Here are a couple videos https://youtu.be/H0_6VmY6mns
    https://youtu.be/bGfpe67UIN8

    If i could do this on my hobbymat md65 lathe would be great, any advice on how i would center the boring bar to be perfectly center throught the whole length of travel?

    Would i need a laser for setting it up by placing the laser in the chuck and taking bore beasurements?
    Attached Images Attached Images

  8. #8
    Join Date
    Jun 2005
    Location
    Helensburgh
    Posts
    618

    Default

    Quote Originally Posted by gazza2009au View Post
    The bike is a YZ250F 2005yeah there are two sleeve companies that make the sleeves one is WISECO the other is L.A Sleeves the second one is available in Aus to purchase at $135 that is why i cant work out why a shop would charge $450

    I may see if my cylinder fits on my lathe
    Brian Stockman ran a lot of these motors in Superkarts, he may be able to help you. Google for his details, I think he lives in Tamworth from vague memory.
    CHRIS

  9. #9
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    Aug 2009
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    Sydney, NSW, Australia
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    Default

    Cheers Chris and all others who are helping

    I just put my milling attachment on the cross slide and sat the cylinder in place do u guys think a boring bar can machine that far away from the chuck without the dead center?

    I got a quote back from the nikasil plating guy cost is $450 that includes +3mm over bore, replate and welding but if i can sleeve it my self i save a lot of money over $300 and i will likely do more for my bikes in the future as i have been riding my whole life
    Attached Images Attached Images

  10. #10
    Join Date
    Jun 2005
    Location
    Helensburgh
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    618

    Default

    I think you need a seriously stiff set up including a really solid lathe to do that. Then it will need honing to size on something like a Sunnen hone (preferably) to finish to size. I am not a fan of Wiseco but that is just me, they used to have a bad habit of seizing very easily. Hit up Stockman, he has been out of big time racing for some years I believe so he might or might not have any. I have been out of it for about five years so any contacts I had are all gone. There used to be a very active two stroke forum in NZ and it may still be going.
    CHRIS

  11. #11
    Join Date
    Mar 2009
    Location
    Melbourne
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    54
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    825

    Default

    If you do decide to have a crack yourself I'd be more inclined to bore it out on a mill.
    Set it up with the head side down on parallels or 132 blocks, indicate up and down the cylinder in X & Y and shim as required.
    Having said that, I think you'll find the hardest part of the job (and reason it's so spendy) is not the boring itself but cutting the ports in the new sleeve.
    I had my XR250 cylinder re-sleeved for an oversize piston back in the mid 90's and from memory that was around the $150 mark back then and that's a 4 stroke so much simpler.
    Cheers,
    Greg.

  12. #12
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    Aug 2009
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    Sydney, NSW, Australia
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    Default

    This hobbymat md65 is a pretty strong lathe, the cylinder is cast aluminium i was going to fab a plate to go between the cylinder and milling attachment and bolt it down tight with sunk bolts into the aluminium fab'ed plate so it all sits flush


    If it doesnt pan out and i ruin the cylinder its current value is $0-$40

  13. #13
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    Aug 2009
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    Sydney, NSW, Australia
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    Default

    Quote Originally Posted by kwijibo99 View Post
    If you do decide to have a crack yourself I'd be more inclined to bore it out on a mill.
    Set it up with the head side down on parallels or 132 blocks, indicate up and down the cylinder in X & Y and shim as required.
    Having said that, I think you'll find the hardest part of the job (and reason it's so spendy) is not the boring itself but cutting the ports in the new sleeve.
    I had my XR250 cylinder re-sleeved for an oversize piston back in the mid 90's and from memory that was around the $150 mark back then and that's a 4 stroke so much simpler.
    Cheers,
    Greg.
    Hey Greg this is a 4 stroke cylinder no ports just a strait sleeve

  14. #14
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    Jun 2005
    Location
    Helensburgh
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    Default

    Ignore me then, I thought it was a two stroke.
    CHRIS

  15. #15
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    Aug 2008
    Location
    Melbourne
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    Default

    Quote Originally Posted by gazza2009au View Post
    The bike is a YZ250F 2005yeah there are two sleeve companies that make the sleeves one is WISECO the other is L.A Sleeves the second one is available in Aus to purchase at $135 that is why i cant work out why a shop would charge $450

    I may see if my cylinder fits on my lathe
    Because doing work takes time, not just parts.

    The average job shop is going to be charging $100-150 per hour to cover wages, power, property costs, insurance, tools and all the other stuff that goes with running a business before they actually make a profit.

    Now I'm not familiar with what's involved in a job like this, but 2-3 hours to do it certainly doesn't sound unreasonable.

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