Just for laughs, quickest 250cc dual sport, lol.

Discussion in 'Thumpers' started by fightinggoat, Aug 14, 2012.

  1. fightinggoat

    fightinggoat Adventurer

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    Ok, I know none of them are fast, this is just to settle an argument between friends, of the older dual sport 250cc bikes, which is quickest to 60mph with stock gearing and equell basic power mods, no big bore kits or anything like that. Newer bikes dont count, just the 250's that are available to everyone on the used market, I.e. klr250, dr250, supersherpa, xt225, ext. Must be street legal out of the box and four stroke only. The only 250 I have ever ridden is a stock honda rebal, and man it was slow, so let the fun begin! y
    My vote goes to klr250 just because of the high compression ratio, I have never riden one so cant say for sure, my buddy says xt225 cause of the weight. What say you?
    Please keep this thread fun, its a goofy topic just because, no need to pick it apart.
    #1
  2. kirbi69

    kirbi69 Been here awhile

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    honda xl250r it has 24 hp at the wheel and weighs 288 lbs
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  3. Wolfgang55

    Wolfgang55 Long timer

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    WR250R or WR250X, good FI system, easy to power upgrade.
    Valve adjustment 24,000 miles, very tough motor.
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  4. Harvey Krumpet

    Harvey Krumpet Long timer

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    Bugger, 4t only.......

    FWIW the wee DT is over 40hp & happily tops the imperial ton if I'm cruel to it.

    Ok, I'm getting me coat..
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  5. Hawk62cj5

    Hawk62cj5 2 Cheap 4 a KLR

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    One way to find out .... :evil
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  6. XDragRacer

    XDragRacer Long timer

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    Somewhat outside the OP's zone, Wolf:
    Can't compare with others in the class, but my KLR250's been clocked at 80 + mph ("closed course, professional rider, do not try this at home, etc.') with a 14-tooth countershaft sprocket . . . the six-speed transmission gives it lots of versatility, both on and off-road.

    The four-valve, DOHC engine winds pretty tight, in a hurry to get to redline. The high-compression engine delivers considerable performance for a 250 of its generation, IMHO; not claiming any absolute superiority, but I think the KLR250's performance may be under-rated as a dual-sport; YMMV! :rofl

    Road test? Summerduck Dragway; Thursday nights!
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  7. lamotovita

    lamotovita Ageing Adventurer

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    TDR250 Yamaha
    It's got 2 intake valves, 2 exhaust valves and 4 strokes (2 on the right and 2 on the left).
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  8. RedRaptor22

    RedRaptor22 Been here awhile

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    Well not having much experience with the smaller ones I would say probably the Wr250, it's the only one I've ridden other than a beat to hell old Xr250 and it'd probably knock the bold new graphics right off the honda I rode.

    But you can figure it out scientifically with some of that math stuff, just look up the torque numbers and weight on each, figure how much the power to weight is and the one with the highest torque to weight will win with the correct gearing...being a simple mod like you stated is acceptable.

    Horsepower does'nt matter in drag racing, it's all about torque as that is what controls acceleration, horsepower is just the measurement of work being done at a certain rpm, the more hp the more work an engine can do and the faster the top speed can be, but it plays no part in acceleration whatsoever.
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  9. tntmo

    tntmo Been here awhile

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    Honda NX250. Liquid cooled 250cc four stroke engine, 6 speed transmission. Would be a nice powerplant to put into a modern chassis with good suspension.
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  10. fightinggoat

    fightinggoat Adventurer

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    The wr250 is dq'ed since it isnt old tech, maybe once I get some free time I will lool up the specs for these little bikes and post the results. I know its not a thumper or dual sport, but I heard tell that the fzr250 made somewhere around 48hp, that has yet to be beaten by any other 250. That would be a fun motor to have in these bikes, would surprise a lot of people for sure.
    Btw: can anyone who has ridden a rebel and a dual sport 250 like the ones in this thread tell me how they compare in terms of acceleration? My rebel was a dog, but it was my first bike, I have since come off much bigger bikes and want to get a little ds for fun but dont want to be bored with it in a month like I was with the rebel, felt like I was riding a scooter shaoed like a small motorcycle, lol.
    #10
  11. Kawidad

    Kawidad Long timer

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    Yamaha TTR250 ?????
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  12. Beezer

    Beezer Long timer

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    torque is a measure of force (work)... "power" (including horse power) is a measure of force includes time and thus, is a measure of how fast you want to do the work. sorry, thats the rules of physics
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  13. Pantah

    Pantah PJ Fan from Boston

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    Well, if you are going to twins, why not twin two strokes? A 1999 Aprilia RS 250 makes 63hp at the tire and is good for about 140mph at Daytona. A 1997 TZ 250 makes about 80hp and its top speed is about 155 or so... :deal
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  14. TexaNate

    TexaNate Been here awhile

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    QFT. New 250cc bikes have to meet emission requirements that the old ones never did.
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  15. IheartmyNx

    IheartmyNx Ihave2draft

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    Prove it. How come a DOHC, liquid cooled, 283lbs, 11:1 c/r can only be 29 crank and 26 wheel?

    Sorry, but there's no way a sub-10:1 c/r, air cooled can achieve that... At least not without the life span of a house fly.

    Is that a net, gross or peak hp?



    x2. Modern-shmodern. HP is HP. Weight is weight. Sure my suspension might have been cutting edge when Lincoln was in office, but I sure don't have a problem keeping up with anyone...

    Max speed per THE LAW in this state is 65 anyway...
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  16. IheartmyNx

    IheartmyNx Ihave2draft

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    Sans a 20,000 rpm powerband, right?

    The VTR250 is 13,000.


    Not too practical for anything less than track or bouncing it off the rev limiter everywhere you go.


    NX250: 70.0 × 64.8 mm (2.76 × 2.55 in)
    Fzr250: 48.0 x 34.5 mm (1.9 x 1.4 inches)
    #16
  17. kirbi69

    kirbi69 Been here awhile

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    i got the info off wikipedia
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  18. XDragRacer

    XDragRacer Long timer

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    Not sure Mr. Newton would agree, RedRaptor22!

    Horsepower and torque of an engine are related:

    <DD>[​IMG] </DD>Horsepower, as beezer pointed out, relates to work (force X distance) per unit time. Torque has no time component. One horsepower equals 550 lbs force X 1 foot per second, or 33,000 lbs force X 1 foot per minute; since rotational speed is expressed in revolutions per minute, the figure, 33,000, appears in the formula.

    Simplifying the forumula, power (hp) = (torque (lbf-ft) X rpm)/5252

    Conventional physics considers acceleration proportional to power.

    Googling "torque vs. horsepower" produces a confusing, overwhelming number of hits.
    #18
  19. Badjuju

    Badjuju Biker Billy

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    Wha...? Uhhhh, ummm, when did this happen? Damn, gonna have to back it down a bit from now on. :D
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  20. IheartmyNx

    IheartmyNx Ihave2draft

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    No, but Lingenfelter would. :cry

    "Horsepower sells cars, torque wins races"
    #20