best displacement on a dirt bike

ktm 125
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GR
are the 450s the best we can get? can an open 2 stroke be faster on a track? Or maybe a 4 stroke fe a little smaller or a little bigger can do better lap times? What about fatigue on a 30 min plus race. I mean on extreme enduro 2t 300s rocks but its a different sport. Still im asking cause sometimes rules are made for bringing the new tech on a competitive lever as fast as possible. So 450s outclasses 2t 250s almost instantly. But now 20 years later they still are the ideal bike for racing and results or something different can be faster without wore out the riders?
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ATKpilot99
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Lake Geneva, WI, USA
11/20/2022 2:24pm
How many watts is a Varg ???
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tobz
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3/5/2007
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Adelaide, AU
11/20/2022 2:29pm
Bored huh?
bvm111
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7/1/2008
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Las Vegas, NV, USA
11/20/2022 2:38pm
I want to try the 300 SX!
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The Shop

11/20/2022 2:41pm
tobz wrote:
Bored huh?
80 over. Wheelies in every gear now
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GrapeApe
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Mc Kinney, TX, USA
11/20/2022 2:58pm
About tree fiddy
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NP301
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Keene, NH, USA
11/20/2022 3:15pm
GrapeApe wrote:
About tree fiddy

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11/20/2022 3:33pm
Well if you are going to ride the 125 class I would guess a 125 Blush
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11/20/2022 7:16pm
As a vet lady rider my favorite bikes in recent years are the 350sx 4-stroke and 250sx 2-stroke. I've ridden every color 450 and several 250 four strokes, they are all good bikes but 350 4-strokes have the best mix of light-feeling handling and usable 4-stroke power. Nothing beats the fun of riding a lightweight 250 2-stroke.
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wildbill
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Christmas Valley, OR, USA
11/21/2022 12:28am
Queen's got it dialed. Whichever you have the most fun on is the one. For me in my vet years the CR 500 was the one. Holeshots forever.
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CPR
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AU
11/21/2022 12:58am
Most aren’t ready to admit it, including the manufacturers, but a 450 4t is just like the 500 2t was; too much bike for the majority of tracks and riders.
Luckily technology has prolonged the 450s life by making it easier to ride, but sooner or later it’ll be gone, we’ll all move on and they’ll be relegated to nostalgia and dirt track/ desert riding etc like the 500 before it.
However to date, nothing beats a 250-300 2t in the fun factor.
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Bearuno
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AU
11/21/2022 1:56am Edited Date/Time 11/21/2022 4:16am
Best Displacement ? It's whatever You like.

Heck, I use my CRE500 for single track and what some would call 'extreme' riding. Not for much, well, virtually any, fast work nowadays.

As a new ICE Bike, I'd love to have a modern, 350 - 400cc 2 stroke.

But, they don't exist.

I'd say an E Bike that suits my needs - as in, a real Enduro type bike, not a Foo Foo bike, from a Major Manufacturer ( I've 3 friends awaiting Stark Vargs - and yes, they are 'sort of' happy to wait on them, so I'll get to ride those) will be available before my preferred, and almost certainly forever non existent ICE bike. So, I'll end up on one, while keeping my ICE bikes 'til I cark it.
Falcon
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Menifee, CA, USA
11/21/2022 10:30am
KTM built an SX200 back in the day. I never rode one, but I think that might be ideal for a dude like me. I love 125s, but they're not easy to ride. You have to hammer them. Sometimes a 250 is a little tough to ride hard. A 200 might be that sweet spot.
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vdrsnk04
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2229
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Location
USA
11/21/2022 11:25am
Any displacement. As long as we are all on something with 2 wheels and an engine or motor idc. 🤘
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Press516
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5816
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9/11/2018
Location
Gilbert, AZ, USA
Fantasy
11/21/2022 11:28am
250 2T and 350 4T.

My favorite was always 125's... Just appreciated the feel of throwing it around and keeping the grip twisted.
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Muttly
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10/3/2021
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Mills, NM, USA
11/21/2022 11:36am
Over square? Under square? BxBxSx.7854x1?
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FWYT
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3558
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5/25/2014
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San Diego, CA, USA
11/21/2022 11:40am Edited Date/Time 11/21/2022 11:40am
Falcon wrote:
KTM built an SX200 back in the day. I never rode one, but I think that might be ideal for a dude like me. I love...
KTM built an SX200 back in the day. I never rode one, but I think that might be ideal for a dude like me. I love 125s, but they're not easy to ride. You have to hammer them. Sometimes a 250 is a little tough to ride hard. A 200 might be that sweet spot.
I rode one for many years. (EXC, actually.) It was indeed and damn good motor. That bike was awesome.
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ctbale
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1/4/2014
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Gustavus, AK, USA
11/21/2022 7:02pm
Everyone on Stock 1974 Honda XR75s

Its all you really need.....
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Titan1
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9443
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Lehi, UT, USA
11/21/2022 7:56pm Edited Date/Time 11/22/2022 11:32am
I wish a Japanese manufacturer-preferably Yamaha-made a 300 or 350 four stroke…I’d own one.

450’s are too "heavy" for me…250’s (four strokes) don’t have enough top speed, and I’m always looking for another gear on them (I’m a desert rat)…but a 300/350 four stroke would be ideal I think…I just don’t want to pay $13k for one from a European manufacturer, so I stick with 450’s.
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quadmx301
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Murrieta, CA, USA
11/22/2022 7:18am
Mix gas and it doesn’t matter
wrc777
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5/21/2020
Location
Greenwood, IN, USA
Fantasy
11/22/2022 7:48am
Titan1 wrote:
I wish a Japanese manufacturer-preferably Yamaha-made a 300 or 350 four stroke…I’d own one. 450’s are too "heavy" for me…250’s (four strokes) don’t have enough top...
I wish a Japanese manufacturer-preferably Yamaha-made a 300 or 350 four stroke…I’d own one.

450’s are too "heavy" for me…250’s (four strokes) don’t have enough top speed, and I’m always looking for another gear on them (I’m a desert rat)…but a 300/350 four stroke would be ideal I think…I just don’t want to pay $13k for one from a European manufacturer, so I stick with 450’s.
If you shop around you should be able to find a gasgas EX350F (6 speed) for around $10k maybe a little less if you can find a leftover '22. Used prices are finally coming down too.
FreshTopEnd
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13293
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Location
Sacramento, CA, USA
11/22/2022 10:20am Edited Date/Time 11/22/2022 10:20am
Falcon wrote:
KTM built an SX200 back in the day. I never rode one, but I think that might be ideal for a dude like me. I love...
KTM built an SX200 back in the day. I never rode one, but I think that might be ideal for a dude like me. I love 125s, but they're not easy to ride. You have to hammer them. Sometimes a 250 is a little tough to ride hard. A 200 might be that sweet spot.
The KTM 200 engine is one of the great engines of all time, but there is not a precise class fit. It would be the perfect two stroke for a 250F class that did not allow 250 two strokes.

There was a run of projects with people dropping 200 engines into the first generation 125/150 sx linkage frames 11-on because the the cases are the same, which gave you a pretty modern 200 MX bike. Folks have worked with the later linkage frames by modding the new 125/150 cases. And you used to see 200 engines dropped into the first generation Suzuki 250f frames.

I built a moto based 2008 XC/SX hybrid, the only non 200SX part was the power valve governor (or the 200 specific springs), which is different in the 200 SX to allow it spin up faster. Such a fun bike, but my body was over riding. Still have a stock 200SX pipe if anyone interested.
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