OzVMX Forum

Marque Remarks => Yamaha => Topic started by: Nathan S on April 29, 2008, 11:06:30 pm

Title: What's this barrel?
Post by: Nathan S on April 29, 2008, 11:06:30 pm

(http://i46.photobucket.com/albums/f128/annaandnathan/weirdbarrel.jpg)

Now, before you all say "That's just a YZ125F barrel you twit!", have a closer look - particularly at the lack of visible steel liner.

The head is marked 2X3 (YZ125F), but the barrel is 2Y5. I've got NFI what a 2Y5 is, and it doesn't return any matches on Speed and Sport.

Title: Re: What's this barrel?
Post by: cyclegod on April 29, 2008, 11:16:32 pm

2X3 = 2Y5 which is YZ125F that was the prefix on both barrels I had on mine in NZ. In a yamaha hand book i once had it listed every detail difference between the YZ100/125E and YZ100/125F and it included details that indicated certain countries got 2X3 and others 2Y5.

Title: Re: What's this barrel?
Post by: Freakshow on April 29, 2008, 11:33:44 pm

is the bore coated ?

Title: Re: What's this barrel?
Post by: Nathan S on April 30, 2008, 08:14:13 pm

It appears to be a chrome or nicasil type bore, which is the interesting bit.

Title: Re: What's this barrel?
Post by: holeshot buddy on April 30, 2008, 08:29:39 pm

a lot of factory barrels were plated  ???
could be never know

Title: Re: What's this barrel?
Post by: TC91 on April 30, 2008, 09:12:10 pm

It looks a lot like the optional factory barrel. Chrome bore, slightly different port timings. I have one and had it on my  YZ125F in '79 and can recall a marked difference when we swapped to the factory barrel.Not huge but enough.

Title: Re: What's this barrel?
Post by: Nathan S on April 30, 2008, 10:30:38 pm

Ah, so that pretty much answers the second part of my question.

Thanks all. :)