Yamaha YZ 300 GYRT Kit

[Moto7man]

I just saw this on the Yamaha webpage, The listing indicates this is a new kit, Yamaha must be getting ready to get back into the two stoke game.

Here is a new link,

http://www.yamahamotorsports.com/spo.../0/detail.aspx

[gasgasman]

Link no tengo.

[einsteingarage]

ATHENA 300cc Big Bore Kit for YZ250

This all new two-stroke kit increases YZ250 displacement to 293cc.

? Cylinder is nickel-carbide plated with enlarged water passages for exceptional durability and performance

? Bore increased to 72mm (stock is 66.4mm); stroke remains the same as stock (72mm)

? 15:1 compression ratio

? Forged, domed piston

? No case machining necessary

? Kit includes cylinder, head, piston, rings, pin, clips, power valve assembly, and all required gaskets

YZ models are for closed-course use regardless of modification.

Fits ?03~?13 YZ250

DBY-ACC56-34-48


DBY-ACC56-34-48 $1,294.99

[Hawkeye]

Not sure this signals any new direction from Yamaha, seeing as how they are just putting their GYTR label on the Athena kit, and Athena has made a big bore kit for the 2T 125 and the 250F for years now. After riding my YZ250 for years, I'm not sure if a 300 kit would give a clear advantage over a well jetted stock displacement motor. My 2006 has a lot of low end poke and a fun mid, even before I had it ported and the head milled for 50/50 pump and race fuel. Wow!

Not sure about the Athena kit, but lots of big bore YZ motors tested in the past have some tradeoffs for the increased torque - increased vibration, harder starting and less top end are the three I've heard. Common to all brands with displacement increases.

Now if Yamaha dropped their 2T motors into the new 2014 chassis for the 250/450F, that would be a strong statement that they intend to continue 2T development and sales focus, IMHO.

[ScottyR]

I have a buddy who works for Yamaha Canada and he says there is a good chance that EU will get a YZ300 next year. He did say it will be a YZ250 with a factory installed Athena 300 kit.

[Hawkeye]

Cool. Wonder if Yamaha is planning in chassis updates for 2015, and to bring the 300 to the US market?

[Moto7man]

Originally Posted by Hawkeye

Cool. Wonder if Yamaha is planning in chassis updates for 2015, and to bring the 300 to the US market?

I would be down with a new steel chassis.

[Moto7man]

Originally Posted by ScottyR

I have a buddy who works for Yamaha Canada and he says there is a good chance that EU will get a YZ300 next year. He did say it will be a YZ250 with a factory installed Athena 300 kit.

That makes a lot of sense. New 4T sales are down and 4T resale value is poor. Also, the four stroke development along with aluminum chassis development is stagnant. I bought one of the first YZ400s brought into the US. It was a fun bike but it weighed about 254 pounds. Now, the new aluminum 450s weigh only about twelve pounds less even with the aluminum frame. That is stagnant development, IMHO.

[Vindicator]

The 300cc kit is Yamaha's reply to KTM & TM 300MX bikes to be used on the European 300 2-stroke championship next year. Yamaha doesn't really want to invest on 2st but doesn't want to be left out of the game. It's a good choice if someone want to go with the YZ for this championship . I have to admit it would be awesome to see the "old" Yamaha beating the crap out of recent KTMs

[Bandit9]

If they would offer the YZ in an XC version, Adjustable Power Valve, bigger tank, WR tranny, 18" rear wheel, they would break sales records.

I would like a new steel frame too. Alum is just too rigid and I felt the vibrations way more on the Alum frame.