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2002 Yamaha YZ125 vs YZ250F

Friday, November 8, 2002
2003 - YZ125 vs. YZ250F
Yamaha makes two bikes which get rave reviews from riders, so when they're put head to head, which comes out on top?
Six Strokes and Four Wheels

Which engine type makes a better motocross motor?

There's a rumbling in the air around motocross tracks, but it's not the kind of thunder created by nature. It's the baritone rasp of a high-po 4-stroke engine kicking roost at the pre-mix gang on their 2-strokes.

It's a revolution of sorts, where the dirty, mosquito-toned 2-strokes are clinging to the last vestige of their relevance in the face of governmental regulations and new 4-stroke designs. If you missed it, here is our detailed description of the rise and fall of 2-strokes.

Yamaha, being the first of the big factories to field a competitive 4-stroke motocrosser, has become the leader in 4-stroke dirt bikes. Thus far, it's the only company to have won a national championship on the booming 4-strokers.

The success on the track for Yamaha's 4-stroke dirt bikes has resulted in a huge jump in sales of its range of competition dirt bikes, up 127% from 1997 through 2001 compared to the industry's 87%. Though its 2-strokes remain near the top of the sales charts, it's the 4-stroke YZ and WR 400/426Fs and 250Fs that have really boosted Yamaha's marketing position. Currently, Yamaha sells more YZ250Fs than any of the competition's 125cc dirt bikes, and the YZ426F sells at a pace about even with the YZ250 2-stroke, with numbers not far behind the 250F.

To find out what the big deal is about these new challengers, we plucked two natural enemies from the confines of Yamaha's warehouse: a YZ125 2-stroke and YZ250F 4-stroke that compete against each other in the AMA's 125cc National Motocross and Supercross classes.

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Piglet2010   August 27, 2011 10:57 PM
Yes, it is unfair that a 2-stroke spews out more crap (HC, CO and NOx) that a 4-stroke twice its displacement. If you think this is unimportant, you are playing into the hands of those who would ban *all* recreational OHVs.
R. Schmidt -Pres. of Revanche2strokes.com  December 14, 2010 06:55 PM
Why do we allow this to happen, why do we stand still and let everyone race/test a 125 2 st. against a 250 4 st. or a 250 2 st. against a 450 4 st. and we treat it like this is how things should be? This is hugely unfair and it shouldn't be allowed to happen. It ranks up there with you being a 125 lb. boxer and your competition is always a 250 lb. fighter and if you don't like it....well tough, that's just the way it is. AND, when the fight results are written, they never tell the unsuspecting public the truth, they only say that you ( the 125 lb/ fighter ) just wasn't quite good enough. Would you be ok with this or better yet, if you were the 250 lb. fighter, wouldn't you WANT to fight another 250 lb. fighter, so you could really say that you were the best? I would and so do us 2 strokers.
dean -2 strokes all the way  July 23, 2010 02:16 AM
I have a 125 2 stroke and it so much more fun to ride than my mates 250 4 stroke, 2 STROKE FOREVER!!!!!

derrick -f**k four strokes  July 12, 2010 08:56 AM
of course 4 stroke will win in the long run the have a way bigger engine but 250 2stroke will blow away a 250 four and a 450 4 strokes just have bigger engines thats the only reason why there faster in the long run 2 strokes for life
Tanner Nav -stupid  August 23, 2009 04:21 PM
125s are better than a 250f man the only difference is a smoother ride i havent had any problems with mine
mitchell -4 strokes kick arse  June 30, 2009 08:31 AM
ive ridin both 125's and 250 4 strokes and the 250f is so much betta. yes its a more comfortable easy ride but thats what you want to win. not always havin to battle it n b on it 24/7. if u really wanted to win then y not take the option to make things easier meaning it allows you to ride harder. none of this crap b a real man n ride a 2 stroke, that would b sayin bilko n cam sinclair n bubba stewart n chad reed n all them r girls n im 110% sure they rnt a bumch of girls! so grow up n go wit the times!!!!
jack -2-strokes vs. 4-strokes  June 16, 2009 10:55 PM
there is no diffrence exept the 4 stroke is for a for say LAZY rider when a 2 stroke u always have to be on it but they still can take on a 250 a 125 i ride them and im 5 foot 120 and it rips like a rocket ship so the four stroke is so great then y are so many ppl riding 2 strokes still? ppl over exadrate 4 strokes VS. 2 strokes its stuiped!!!! 2 STROKES ALWAYS!!!!!!!!!!!!
justin anglin -2 strokes r the best  May 14, 2009 09:31 AM
i think that 2 strokes are way funner i have a yz125 and my friend has a kx250f and i can smoke his ass like nothing on a track and it messes up all the dam time i think they should let 2 strokes run with the 4s
joe -dumb  April 14, 2009 11:02 AM
whats stupid is, and ive heard people say it, is " dude you still ride a 125!? ..and you're how old?" like these people think they ride a big boys bike just cuz its twice the size. Same crap, just the thumper has more low end which makes them smoother and broader not more power, if they were a real big boy they wouldnt need the easy smooth lazier ride of the banger over the worry free dingers.
willy weiers -2 strokes will never die.  April 12, 2009 05:14 PM
i agree with 4-strokes being the "WAVE OF THE FUTURE",but that doesnt mean 2 strokes need to suffer in the process. 2 strokes are cheaper to build and a HELL of alot funer to ride. new 4 strokes arent that much more reliable if anything their less reliable. they have cooling problems,valve problems. if u read in the manual for any 250 or 450 4 stroke it calls for an oil change after every other ride. wtf is the matter with that!!! i wish they could race 250 2 strokes with 250 4strokes and 500 2 strokes with 450 4 strokes. then will we see where the bear really shits in the woods. 2strokes all the wayyyy!!!!!!
logan pierri -make it fare for 2 strokes  February 19, 2009 08:15 PM
if people think 4 stroke 250s are the new best thing they should let the 2 stroke 250 race with them and see how real bikes run.