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Discussion Starter #1
hay guys just wondering if my kx125 would win/keep up with an 06 crf250 Thanks
 

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I would say it depends on the abilty of the rider and probably would help if your kx was newer.
 

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It's all about the rider between the two bikes. Tune it before you try and hang on for dear life and you will come out ahead!:mrgreen:
 

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I would say it depends on the abilty of the rider and probably would help if your kx was newer.
+1

The 125 smoker has a pretty tight RPM range where you get good power. Fall out of that and you fall behind.
The thumpers can damned near run the entire track in one gear... excellent low end torque.

Run a few laps and then swap rides, then run a few more... the better rider will win both times, but there's a reason that a few years ago, the 250 thumpers were pretty much all you saw in Supercross in the 125 class, while the 250 class was still loaded with 250 pingers and only one or two 450 thumpers.
 

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Discussion Starter #6
cool thanks for the help ill tune my 125 and get it running mint and as you said we can swap bikes and the best rider will always win
 

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No offense to any of you, but a 1991 KX 125 will not out run or out handle a 250f, and it doesn't matter whether it's a drag race or on a track. the 250f has at least a 13 year technology advantage. Maybe if it was an 03-04 125 I might agree in a drag race, on the track with equal riders the 250f will win hands down. When Yamaha introduced the 250f, I saw mediocre riders all of the sudden lead and win races, definate advantage.
 

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No offense to any of you, but a 1991 KX 125 will not out run or out handle a 250f, and it doesn't matter whether it's a drag race or on a track. the 250f has at least a 13 year technology advantage. Maybe if it was an 03-04 125 I might agree in a drag race, on the track with equal riders the 250f will win hands down. When Yamaha introduced the 250f, I saw mediocre riders all of the sudden lead and win races, definate advantage.
no offense taken because I believe that was already stated.
 

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Discussion Starter #10
yea i raced my mate yesterday with my kx125 and i was keeping up with him


o yea my bike is 1991 but its got all new ohlins front shocks rear shock carbon reed race ported pro-circuit fatty pipe 304 silencer

heaps of stuff but yea the fact is its 17 years old
 

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I overlooked that we were talking about a 1991 125.
Still, I don't think the engines are that different, but the suspension of a newer model is going to be a big help against a newer thumper.
 

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The riders ability is the key. Where the 4 stroke can pretty much cruise around, the 2 stroke must stay in it's powerband. Even if the riders are somewhat equal to as far as the 2 stroke rider is riding the way it's supposed to be ridden, I believe the 2 stroke will win.

Honestly, I have proven this. I try to explain to ppl here, it like 2 cars drag racing: i.e. Big block chevy, big cid, big tq motor with a stock torque converter vs. a small block chevy with a 3500 stall converter. Even though a motor has cubes and tq but has to use it's entire range of rpms, then, trying to compete against something thing that is already in or near its peak rpm all the time.

I have even done the bike swap with a friend and as long as he held it in the powerband, it was very hard to keep up. And vice versa when we swapped back.

Plus the Pinger roosts alot more and has a tendency to keep ppl off your a$$:lol:
 

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This is a topic that will generate alot of conjecture, and at the end of the day you will believe what you believe. On a MX track there is noway the 2t will run with the 4t, if track conditions are ideal they will be able to do a better job. Look at the 125 nationals a few years back, the ONLY person to make a 125 work was Bubba, When you looked on the starting gate at the Supercross or the nationals 95% of the bikes were 4t, why because if you didn't have one you were going to get your a$$ handed to you. I've had both and can honestly say there is now way a 125 can run with a 250f, Kawi 125's haven't been the fastest anyway, mine were heavily modified and an equal 4t rider would blow them away. Its not all about displacement either, its more about putting the power to the ground, the 4t puts it down. The analogy about the big block and the small block with the stall converter illistrates the point, the 4t puts it down the 2t is spinning the tire, 4t traction 2t roost=spin. Mind you I'm not a fan of the 4t, but if your going to race you have to have one to be competitive. Of course in a couple of years it isn't going to matter because there won't be any 2t MX bikes left.
 

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Good point.

My term is cc for cc. 2t 250 vs. 4t 250 as a 4t 450 vs. a kx500 (almost unheard of now). That's when it get interesting.
Personally I don't really care, I just wanna ride. That's what it's all about. For racing, I keep it to 4 wheels and drag.
 

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Anyone read the Dirt Rider column from the Spring "I Beat Ryno"? One of the editors raced an RMZ 450 against Ryan Hughes, who rode eveything from a 450 to an 85 (even the DRZ 125) and won every race. The editor finally won when Ryno mounted a mountain bike.

The point is, if you are even close in skills, the 250F will win every time. If there is a large disparity in talent, the faster rider WILL win. even on a 17-year old smoker.
 

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Anyone read the Dirt Rider column from the Spring "I Beat Ryno"? One of the editors raced an RMZ 450 against Ryan Hughes, who rode eveything from a 450 to an 85 (even the DRZ 125) and won every race. The editor finally won when Ryno mounted a mountain bike.
Ya, but had the editor been riding a CRF230, Ryan would have lost every race :biggrin:



I'm only half joking....
 
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