YZ426f vs YZ250 race

Yamaha YZ426F Yamaha YZ250

45 replies to this topic
  • grayracer513

Posted February 06, 2016 - 08:11 AM


Both of them will slip the same approximate amount.  The numbers come from real world observations, and 6% was based on knobbies on asphalt.  Either way, the 426 is geared higher, and revs higher, and packs about 5-7 more horsepower.  Both bikes in any kind of good health will top out well ahead of a quarter mile, so it will become s speed contest sooner or later.


In the SoCal deserts, I race against YZ's and other two-stroke 250's all the time (it's a mass start; all classes in each of two skill levels go off together), and all of them complain about the same thing anytime the course runs across a lake bed or a long section of high speed flats; "I could have kept up if I had more gearing/top end".  Otherwise, it's a pretty even deal. 

  • RockerYZWR

Posted February 07, 2016 - 06:31 AM


Yeah, but you have WR 3-4-5 gears - do they? If you had the factory gears, wouldn't you be in the same boat? I know the 1-5 ratios are about the same between 06 YZ450F and 99+ YZ250, but I'm not sure about the primary and secondary reductions. My WR450 will out run my close ratio YZ250 on a straight, period. The bikes have similar power, albeit much different deliveries, but in a drag race, I'd pick the YZ250. Not a 1/4 mile drag race - that's for street vehicles - but in a long start to the first turn kind of drag race, maybe 300-400 feet or something.

  • Andrew Puetz

Posted February 07, 2016 - 07:28 PM


The fact that he spells it "Rode" sums up this thread perfectly

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  • grayracer513

Posted February 07, 2016 - 08:02 PM


Yeah, but you have WR 3-4-5 gears - 


Yes, but I used to hear that complaint long before I added those.  The fact remains that the 426 is a bigger, more powerful engine with longer legs, and there ain't nothin' you can do about that. 

  • RockerYZWR

Posted February 08, 2016 - 05:20 AM


I'll think of something. This is my second favorite type of thread.

  • mikedabike

Posted February 08, 2016 - 02:26 PM


So if the 250 tops out at 66mph given a long enough road my YZ125 would also out run it. Completely stock with the exception of an fmf pipe I have seen 68mph on my gps on the lake beds. Maybe it is the aerodynamics of my 6'3 225 frame. I would think the 250 would be able to at least hit a gearing limited low 70s.

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