6 speed 2 stroke 250cc ?

Discussion in '2 smokers' started by 81cr450, Jul 26, 2012.

  1. 81cr450

    81cr450 Been here awhile

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    I already know this is a dumb question but I'm gonna ask it anyway. I'm wondering if in the 1990's anybody did a 250 2 stroke with a 6 speed. So you can actually reach a comfortable traveling speed & not just have a trail bike that is wrapped out at 60mph. Maybe you can fit a cr125 tranny in a 96 cr 250? I've seen the wide ratio tranny's & that doesnt cut it. Maybe a TRX tranny in a CR. RMX, KDX, WR dont much care just looking for an extra gear, & no I dont have $8g to spend on the new KTM 300
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  2. Harvey Krumpet

    Harvey Krumpet Long timer

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    If there is a good source of Chicken Lips, Rocking horse crap & moon dust near you, you may find a DT 230. Trail & road, yup, fast off road, no. Very capable, though.

    Oops, IIR my KDX 250 was 6 speed, rarely got over 4th, though.
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  3. 81cr450

    81cr450 Been here awhile

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    What year kdx250 I looked & it showed 5 speed. Yum chicken lips... but must be fast offroad need powervalves single rear shock maybe something that could be big bored
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  4. southy

    southy Been here awhile

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    I believe Husqvarna 2 strokes were 6 speeds back in the nineties at least till 98. I think they went back to 5 speed in 99.
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  5. Harvey Krumpet

    Harvey Krumpet Long timer

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    Just checked, it was a 89 KDX 250 SR, they were road legal & yup, 6 speed, so were the 200 SR's. Went like a cut cat too.
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  6. 81cr450

    81cr450 Been here awhile

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    Is SR an oversea's model? Shakey Isles & Havey Krumpet Say Mick'ish, just a guess
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  7. Harvey Krumpet

    Harvey Krumpet Long timer

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    I'm a Jock with his brains bashed in living in NZ:D

    The SR was imported to Australia, NZ & the Philipines, very popular in Japan too. The US got a different model, enduro not road focused I believe so it was more like the KX mx'er & probably shared the same gear box.
    I'm just speculating here, with bikes I just put petrol in them & ride, I'm no expert.
    The KDX I had went like a cut cat & I never found enough space to use top but it did wheelie off the throttle in fourth. One of the reasons I sold it..:rofl
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  8. 81cr450

    81cr450 Been here awhile

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    Living in the high desert, Utah, there's plenty of room to let'm run. I'm generally up for 500c + 2 strokes, but something lighter & not fully set to kill would be nice to ride once in awhile. Getting older & being beaten to death by the bike... yeah my Vag is showing. Just did a KX550AF & it's to much so looking for something different
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  9. Harvey Krumpet

    Harvey Krumpet Long timer

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    Another bike in similar guise to the KDX but betterer is the Honda CRM 250.
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  10. 81cr450

    81cr450 Been here awhile

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    Yea a 6 speed 93-96 cr250 would be the dream CRM was never heard of over here you lucky blokes got that cool tech
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  11. LasseNC

    LasseNC XSessive!

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    The amount of gears doesn't nessecarily give you a higher topspeed, look at the ratio in the top gear of various motors.

    A 250cc stroker is still a relatively small engine and will feel buzzy at 60+
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  12. The Letter J

    The Letter J Long timer

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    Gas Gas EC250 :deal also available in a 200 or 300 flavor. Road legal in most of the world... not in the good ol' USofA. Some were marketed in the states as XC as opposed to EC but they are, aside from very minor differences (such as the size of the flywheel and some of the wiring), the same bike.

    From my owners manual:

    1st- 2.071
    2nd- 1.625
    3rd- 1.333
    4th- 1.1
    5th- 0.913
    6th- 0.791

    That's a wide enough spread for my needs. the motor could pull taller gearing from the bottom but I never feel the need at the top.
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  13. 81cr450

    81cr450 Been here awhile

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    A buzzy two stroke :huh probably wouldnt be as buzzy as the kx550 or the cr500 after 3 or 4 hours of riding. :D
    Just a guess though. The extra gear would help keep it in the powerband with less gap in each of the steps

    That GAS GAS would be awesome but I'm looking for something cheaper with alot better parts availability.

    Did some looking at the kdx200 & 220 but being based on a kx125 engine doing a big bore to get it to 240 seems like a reliability mess. Also coming from riding 500's I dont want a gutless wonder so I'll probably need to big bore the 250 anyway. Just need something that doesnt beat me up "quite" as bad

    I might just be better off trying a 2003-04 yz250 & doing the wide ratio trans off of a wr400/426. I'm thinking that the general idea of using the wr 4 & 5th is the wrong direction though as that widens the gap in the ratio's in the higher speeds where you dont have as much power to bridge the gaps, but you could gear the sprokets higher to get the top speed up there. Here's the ratio splits between the 2

    YZ ratios are as follows:

    1st 27/14 (1.929)
    2nd 25/16 (1.563)
    3rd 23/18 (1.278)
    4th 24/22 (1.091)
    5th 20/21 (0.952)

    99WR400F
    1st 29/12(2.416)
    2nd 26/15(1.733)
    3rd 21/16(1.312)
    4th 21/20(1.050)
    5th 21/25(0.840)

    This is all IF I can get a fair price out of the 550. Just got it built & aint gonna give it away but building them is alot of fun creating a form of art
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  14. BikePilot

    BikePilot Long timer

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    They were, I used to race one. Quite nice. Also, there's always wide ratio 5spds if you don't mind slightly more gappy gearboxes (e.g., WR250, KTMs, RMX, KDX, etc.)
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  15. Navin

    Navin Long timer

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    You might like a KTM 380? Still a 5 speed but it'll pull tall gears easily.

    We have a 2002 380SX, the power is unreal. I raced a 360SX back then, alot of bike too, but the thing ate kickers and their gears. They can be modded to be reliable though. All of them are pretty cheap these days. The 2002 has a 2009 shock and the original 48mm forks brought up to 2011 OC tech with revalves and they work better than my 2011 Husaberg stock or my upgraded 2007 SXf did.

    Finding one street legal isn't hard either. :deal

    And, yes, they vibrate, but I'd rather try to tame one than build up a KDX!
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  16. 81cr450

    81cr450 Been here awhile

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    Thanks for that Idea on the 380. I hadnt really thought about one of those. It would save on the big bore & if it aint enough I could always do another 500 conversion :evil & it has the newer chassis. I was thinking the 380 was only mid 90's. Yeah that sounds good 02+

    Finding one street legal isn't hard either. :clap . You really get the direction I'm going. I might move the xr if I can get something lighter thats streetable. XR's are friggin heavy, heavy but bullet proof
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  17. Navin

    Navin Long timer

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    Bro, if it "ain't enough" it isn't running right!

    I MX race a 505 SXf and scrambles 530 and 570 4t and the 380 feels like getting hit in the ass with lightning. I won't even take it on the MX track. I've been all 4t for the last decade + and I can't go back to 2t. It requires extreme throttle control, remember these were beating the 500s in Europe back in the day. A guy was leading points in the German sumoto series on a 380 engine in a new frame at least up to a month or so ago. It blows away the 450s! :eek1
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  18. Navin

    Navin Long timer

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  19. Abdelhub

    Abdelhub Blanco Trasho

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    my 380 bit me in the ass many times even with a slow turn throttle and a heavy flywheel weight.....i would think for supermoto the engine would be incredible....its got like 55 hp....in a 240 lb bike....


    <iframe src="http://www.youtube.com/embed/0KQuw2iMpqA" allowfullscreen="" frameborder="0" height="315" width="420"></iframe>
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  20. Navin

    Navin Long timer

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