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Old 07-26-2012, 04:38 PM   #1
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From: Tacoma, Wa

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Recommendations for a machine shop...
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

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Old 07-26-2012, 05:41 PM   #2
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Joined: May 2011
From: LaCenter, WA

I Ride: 2003 Copper SV1K
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.

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Old 07-26-2012, 07:00 PM   #3
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I Ride: 05 KTM 625smc, 03 Are See fiddy one, 05 DRZ470SM, 95 FZR1040, 69 Combat Commando Roadster, 73 Commando Interstate, 67 BSA B44, 71 BSA B50
Milinium technology
They can bore, plate, yada, yada
No liners please. Bad juju

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Old 07-26-2012, 07:35 PM   #4
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“ Quote:
Originally Posted by dragracer1951 View Post
Milinium technology
They can bore, plate, yada, yada
No liners please. Bad juju
Yeah, that place! Couldn't remember their name.

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Old 07-26-2012, 07:41 PM   #5
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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).

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Old 07-26-2012, 08:01 PM   #6
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From: Beaverton, OR

I Ride: 09' Zx-10
Superior Sleeve... He did my R6, good job

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