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Old 07-10-2010, 01:09 PM   #1
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2-stroke vs. 4-stroke

How does a 4-stroke 250 compare to a 2-stroke 250? Are they equivalent on power, but differ in delivery? Or is a 4-stroke 250 more equivalent to a 125cc 2-stroke?
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Old 07-10-2010, 01:46 PM   #2
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250 2 stroke is similar in power to a 450 4 stroke and 125 2 stroke to a 250 four. The power delivery of a 2 stroke is very abrubt and kind of spools like a turbo, whereas a 4 stroke has more of a linear curve to it. In my opinion it easier to learn on a smaller 4 stroke, but 2 cycles can be way more fun to ride, hope that helps.
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Old 07-10-2010, 02:15 PM   #3
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Quote:
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250 2 stroke is similar in power to a 450 4 stroke and 125 2 stroke to a 250 four. The power delivery of a 2 stroke is very abrubt and kind of spools like a turbo, whereas a 4 stroke has more of a linear curve to it. In my opinion it easier to learn on a smaller 4 stroke, but 2 cycles can be way more fun to ride, hope that helps.
yea the only dirt i rode was a 2 stroke 125 or 250, idk. but the way that wheelied was unbelievable
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Old 07-10-2010, 06:19 PM   #4
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+1 to what tomball said. Only thing i can add is that a four stroke 450 compared to a 2 stroke 250 is, to me, a bigger difference than a 125 2-stroke compared to a 250 four stroke. A 4 stroke 450 feels like a freaking tractor with all that torque. It's amazing. All these bikes make relatively the same peak horsepower to their counterparts. However the 4 strokes takse the cake when it comes to torque. The 4 strokes still have a ripping top end as well. Sometimes you can't beat the sound and feel of a 2 stroke screaming in the upper RPMs. I grew up on the 2 stroke MX bikes and i've owned and ridden many of the new 4 strokes. I love them all but my next bike will be a 250 stroke.
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Old 07-10-2010, 06:57 PM   #5
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Old 07-10-2010, 07:05 PM   #6
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Man nothing sounds better than a 250 2-stroke!
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Old 07-10-2010, 07:22 PM   #7
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Man, I'd love to have (or just a chance to ride) one of those 70's vintage Kawi 2-stroke triples or a Yami RD350.
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Old 07-10-2010, 10:02 PM   #8
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Old 07-11-2010, 01:11 AM   #9
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Reliability and maintenance is much better on a 4 stroke, and the torque curve is flatter - BUT... I've got a Suzuki RGV250m Gamma in the garage in race trim, and when that comes on the pipe it's a beautiful thing. Two strokes have the potential to make more power than equivalent sized 4 strokes because they're producing power EVERY time the piston is on the way back down. Four strokes only have a power stroke every 4 strokes (not a coincidence that they're named like they are...) Mine sounds like a 3 ton off hornet and smokes like it's on fire. Gotta love it.
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Old 07-11-2010, 01:28 AM   #10
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4stroke for torque
2stroke for speed...

Nuff said.
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Old 07-11-2010, 02:20 AM   #11
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2 strokes are cheaper to maintain/rebuild and get parts for. Not to mention how easy they are to rebuild, there's nothing to 'em.

You can't beat the smell and sound of a 2 stroke. Pure badass.
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Old 07-11-2010, 10:42 AM   #12
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Old 07-11-2010, 11:39 AM   #13
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Quote:
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Man, I'd love to have (or just a chance to ride) one of those 70's vintage Kawi 2-stroke triples or a Yami RD350.
Me too. I'd love to ride a Kawi H2 some time.
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Old 07-12-2010, 10:30 AM   #14
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I guess Im a little different. I grew up on four strokes in the mountains. My first real bike was an old xl500 and I just got used to big thumpers. I prefer the sound and feel of 4 strokes...two strokes sound almost annoying to me.
And that power curve thing that everyone seems to love....I hate it. When i throttle on my four stroke the power is there, instantly. On the two strokes ive ridden its like I had to wait for the dam engine to spool up to get any umph. Not discounting the 2strokes im sure they're a ton of fun. Just never cared for them personally.
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Old 07-12-2010, 10:43 AM   #15
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Quote:
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I guess Im a little different. I grew up on four strokes in the mountains. My first real bike was an old xl500 and I just got used to big thumpers. I prefer the sound and feel of 4 strokes...two strokes sound almost annoying to me.
And that power curve thing that everyone seems to love....I hate it. When i throttle on my four stroke the power is there, instantly. On the two strokes ive ridden its like I had to wait for the dam engine to spool up to get any umph. Not discounting the 2strokes im sure they're a ton of fun. Just never cared for them personally.
2 strokes are ment to be ridden HARD. I think alot of people ride the 4t because they are easier to ride.
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Old 07-12-2010, 10:53 AM   #16
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Another plus to a 2 stroke is that especially once warm, they are very easy to start. My last 4 stroke was a 2005 crf250 that i bought brand new. That was really easy to start cold and most every time hot as well. Just had a different technique to it. Sucks if you ever got a cold natured 4 stroke or had one that was impossible to start if you stall it in a race. I used to race my old boss's 2002 crf450 every now and then and i stalled it in a race once. It took me every bit of 2 minutes to restart that bike. I was soo off. Just so happened to be the biggest race of the year at 3 palms. Cost me first place. That '02 was unfortunately very easy to stall in a tight inside rut.
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Old 07-12-2010, 11:36 AM   #17
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Quote:
Originally Posted by CCH View Post
Reliability and maintenance is much better on a 4 stroke, and the torque curve is flatter - BUT... I've got a Suzuki RGV250m Gamma in the garage in race trim, and when that comes on the pipe it's a beautiful thing. Two strokes have the potential to make more power than equivalent sized 4 strokes because they're producing power EVERY time the piston is on the way back down. Four strokes only have a power stroke every 4 strokes (not a coincidence that they're named like they are...) Mine sounds like a 3 ton off hornet and smokes like it's on fire. Gotta love it.
Actually, if i'm not mistaken, 2 strokes make power every other stroke. (intake, compression - one stroke.. then combustion, exhaust - second stroke). Your right with the fourstroke. It makes power once every 4 strokes of the engine.
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fkn kdogg just started staring at me like i'm bout to jump off this bike and murder some dave c. i was thinkin ok lets see what i did to this man to make him hate me and how fast can i run
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Muhammad.........Nostradamus..........Kdog
The cycle continues.
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Old 07-12-2010, 11:42 AM   #18
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Quote:
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Actually, if i'm not mistaken, 2 strokes make power every other stroke. (intake, compression - one stroke.. then combustion, exhaust - second stroke). Your right with the fourstroke. It makes power once every 4 strokes of the engine.
You are not mistaken - and neither was I.

I stated that a two stroke is on the power stroke EVERY time the piston is on the way down. That IS every other stroke.
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Old 07-12-2010, 01:36 PM   #19
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Quote:
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You are not mistaken - and neither was I.

I stated that a two stroke is on the power stroke EVERY time the piston is on the way down. That IS every other stroke.
That's right, i misread
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fkn kdogg just started staring at me like i'm bout to jump off this bike and murder some dave c. i was thinkin ok lets see what i did to this man to make him hate me and how fast can i run
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Muhammad.........Nostradamus..........Kdog
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Old 07-13-2010, 09:45 AM   #20
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Thanks for all the feedback.
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