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Recommendations for a machine shop...

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

  1. 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 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. Milinium technology
    They can bore, plate, yada, yada
    No liners please. Bad juju
  4. RedKat600

    RedKat600 Vintage Screwball Staff Member

    Yeah, that place! Couldn't remember their name.
  5. 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. Superior Sleeve... He did my R6, good job
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