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Let me add the asterisk here though... If you are the kind of rider who likes to be aggressive and use a lot of body-English on the bike, and you're the kind of rider who wants to learn to carry speed and commit to stuff every single lap you ride, the 125 or 150 is for you.
If you can be honest with yourself, and you want to have those days, or those laps where you just putter around in the corners and still jump some sections, you're a four-stroke guy and you won't enjoy the little smoker because it punishes lazy riding.
If you're on a 125 or 150, you pretty much have to ride the thing hard at all times to get around the track because you have to carry speed. That's precisely what makes nytsmaC's comment so accurate, but you have to be willing to ride hard and be in shape.
Something to think about.
I don’t really go any faster on a 250f, it’s just a lot easier. It’s always more fun flogging the 144 doing it the hard way.
I actually think I spend more on preventative maintenance on the 125. I do a piston between 13 and 15 hours for a cost of about $125. I am over-cautious with that. I think most guys can get 20 to 25 hours with no problems on a 125 / 150.
The 250F will go 40 to 50 hours on a piston without any issues for the average guy.
When you do the math, you do a piston about twice as often in the two stroke, at a cost that is about half of the four stroke (including gaskets, etc). The four stroke takes twice as much labor time to switch out a piston.
Both suck down oil like crazy. Four strokes you change it often, two strokes you mix it every time.
If you compare maintenance, they're dead even. If you blow up a 250F, that's when they are more costly.
Get the bike you want to RIDE the most.
(disclaimer: The 250 two stroke is cheaper on maintenance if you exclude the cost of exhaust pipes).
Pit Row
Then I bought my first 4 stroke - a 2011 yzf250 then a 2014 rmz250. First lap on the 250f I was laughing and thinking my god this is ridiculously easy, why didn't I buy one of these years ago. But the fun factor of the 125/150 is something not to be overlooked. There's just a level of intensity/excitement on the 2 stroke not matched by the 4 strokes imo. I guess cause you feel like you're riding on the edge at every moment. But then again the torque of the 4 stroke is addicting. Decisions...
And then there's the whole "if I blow this 250F up..." thing and I'm not just talking valves and such. Always in the back of my mind is some bolt coming loose and draining the coolant, oil, or whatever.
I got out my rusty old steel framed '02 YZ250 and slapped a set of SSS forks and shock on it. I was immediately 3 to 5 seconds faster out at Washougal than on the 450F (same day, same conditions).
I put the 450F up for sale and have been riding both YZ250 smokers and the 125 after that.
I have ridden other four strokes I liked (KX450F, 350SX-F, YZ250F) but that blue 450F wasn't for me and I have little desire to get another four stroke when a 250 smoker is enough to be cometitive in 25+ and 30+ where I race.
Get the bike you'll enjoy and forget what your friends tell you. I get a bad start, sure, but I am attacking the whole moto and feel like I'm having fun. I'd rather do that than get a holeshot on the 450F and fade or crash to 10th due to that sketchy blue chassis.
So, no.... the 125 hasn't gotten old for me. I love the things.
And like you.....especially in longer moto's , I know I'm faster on them compared to my 450's. They just suit my riding style better. I don't get as tired either....which is why the 450's were killing me.
If you just ride for fun and you're willing to accept the challenge, you'll have a GREAT time!
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