Recommendations for a machine shop...

Discussion in 'Mechanical & Technical' started by mrs crivens, Jul 26, 2012.


  1. mrs crivens

    mrs crivens
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    Location:
    Tacoma, Wa
    Hi all!
    Just bought an '83 YZ 100 and need to have the cylinder bored....any recommendations for a machine shop in the (preferably) Tacoma area that can do something that small? TIA
     
  2. RedKat600

    RedKat600
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    Vintage Screwball
    Staff Member

    You will need to have it replated also in addition to be being bored. That cylinder doesn't have a liner, the bore itself is hardened or plated to withstand the friction. After looking, it has a nickel carbide plating for hardness. If you just bore it, install it and run it you will ruin it. Your best bet is to send it off to a professional motorcycle engine builder so it can be done right.

    The other option is to have it bored and then sleeved. Neither one is exactly cheap....may want to look at a new cylinder also.
     
  3. dragracer1951

    dragracer1951
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    Staff Member

    17,415
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    2,018
    Location:
    Bremerton
    Milinium technology
    They can bore, plate, yada, yada
    No liners please. Bad juju
     
  4. RedKat600

    RedKat600
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    Vintage Screwball
    Staff Member

    Yeah, that place! Couldn't remember their name.
     
  5. Crivens

    Crivens
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    66
    Location:
    Tacoma, WA
    I'm afraid you guys are mistaken. This cylinder most definitely has a steel sleeve from the factory. That's the way they made them in '83. Yamaha offered 4 oversize pistons for it in .25mm increments. Casual research indicates that the first YZ with a plated cylinder was the 89 YZ125.

    So...what we need is a good old fashion automotive machine shop that can handle something with a 50mm bore (i.e. really small).
     
  6. orng99r6

    orng99r6
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    186
    Location:
    Beaverton, OR
    Superior Sleeve... He did my R6, good job
     
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