Eastern Dirt Magazine YZ/ATHENA 144 Project Bike Part 1

Discussion in 'Yamaha' started by oldhuskyguy, May 20, 2011.

  1. oldhuskyguy

    oldhuskyguy C level Member
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    A little bird flew into the EDM office window this morning chirping very quietly in my ear, it was so quiet it was nearly a whisper. But when I turned the music down enough I heard what all the fuss was about. Rumor has it Yamaha has finally opened it’s ears and is beginning to listen to consumers regarding 2-strokes, namely the YZ144. If this is indeed true, this would mean Yamaha will be releasing a “new” 2-stroke model to the US in the relatively near future. While this is just a rumor, could this bit of news hold a glimpse of the future for MX? Could it be that the OE’s might find a new surge of interest for the 2-stroke engine?… We at EDM certainly hope so. It would be very good for the sport, not only are 2 stroke lighter and more fun to ride. They are substantially easier to work on, and engine parts are more affordable.

    [​IMG]

    It’s ironic this news should come on the very day we sat down to write an article on building your own YZ144. A feature we have been putting together since late August, 2010. Through the summer months we had been going back and forth with the folks at Athena USA about installing their 144 kits on a 125. We just needed a 125 to perform surgery on.

    According to Athena our bike option for the 144 kit is either a 2003-2007 KX125 or 1997-2010 YZ125 (97-04 and 05-010). Apparently Honda and Suzuki made too many changes to their motors each year for it to make sense for Athena to make kits for them so you Honda/ Zook owners out there are out of luck with Athena. This made for the easiest choice we had to make for the entire project. The KX125′s, as great as they look, were not an option since most of the years they were made are green painted turds that are so slow you smell your own exhaust when you ride them. Yamaha has been winning 125 shootouts since the days when Kevin Windham was winning races on them them. Starting this project on the right foot was pivotal to its success and we knew with confidence that just about any year YZ125 from 98 through present day would be a great platform for the 144 project.

    For more follow this link http://easterndirt.com/EDM/?p=7927
     
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  2. BleedMarshall

    BleedMarshall C level Member

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    Good write up thus far on the web article, and I like what I am seeing. I will note that on the later years of the YZ125 ('05 and up if memeory serves) there is a case mod that you may have to complete in order to install a big bore kit. Basically, you need to shave 2mm off the exhaust side of the case so the piston will not bottom out and break. Can be done with a Dremel, and I am unsure if it is for all 144 mods, or just a few. I am sure of the case mod, but unsure on what year and which manufacturer as well.

    Keep the article going as I am looking forward to how it turns out.
     
  3. oldhuskyguy

    oldhuskyguy C level Member
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    Hey BleedMarshall -

    It only took about 3 years to respond! You are correct with the case mod to fit the 144 kit. I am not sure about other models but this bike is a 99 and it needed it for sure.
     
  4. oldhuskyguy

    oldhuskyguy C level Member
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  5. darksidemxer

    darksidemxer C level Member

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    How long till u beat the hell out of it?? I am dying to see how reliable this thing will be. All my highly modified bikes were retardedly fast but short on life lol.
     

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