Recommendations for a machine shop...

mrs crivens · 07-26-2012, 04:38 PM

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

RedKat600 · 07-26-2012, 05:41 PM

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.

dragracer1951 · 07-26-2012, 07:00 PM

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

RedKat600 · 07-26-2012, 07:35 PM

Originally Posted by dragracer1951

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

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

Crivens · 07-26-2012, 07:41 PM

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).

orng99r6 · 07-26-2012, 08:01 PM

Superior Sleeve... He did my R6, good job


07-26-2012, 04:38 PM	#1
mrs crivens Newbie Joined: Aug 2011 From: Tacoma, Wa I Ride: on the back of Crivens' bike! & '11 TTR230	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 __________________ Follow PNW Riders on Facebook and Twitter


07-26-2012, 05:41 PM	#2
RedKat600 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. __________________ Follow PNW Riders on Facebook and Twitter


07-26-2012, 07:00 PM	#3
dragracer1951 Joined: Sep 2005 From: Bremerton 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 __________________ Follow PNW Riders on Facebook and Twitter


07-26-2012, 07:41 PM	#5
Crivens Permit Joined: Aug 2011 From: Tacoma, WA I Ride: Like I'm invisible	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). __________________ Follow PNW Riders on Facebook and Twitter


07-26-2012, 08:01 PM	#6
orng99r6 Endorsed Joined: Jun 2009 From: Beaverton, OR I Ride: 09' Zx-10	Superior Sleeve... He did my R6, good job __________________ Follow PNW Riders on Facebook and Twitter

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