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Teach me about TZ and RS 125s

  1. #51
    Just Registered rolker's Avatar
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by isaac_ View Post
    So if I get one will you teach me how to ride it
    I'm slow, so I can teach you what not to do on a 125.

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    Roland Arsenault
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  2. #52
    Fast is contagious JettaJayGLS's Avatar
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by OreoGaborio View Post
    You better be. I miss Carla.
    And she misses race weekends as much as I do.

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    A man of many names...Jay, Gennaro, Gerry, etc.

  3. #53
    Lifer isaac_'s Avatar
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by Paul_E_D View Post
    Get a good laptimer and invest in a LOT of practice. If it makes you faster, it is correct.
    Isn't that true of almost any bike/rider combo?

    Quote Originally Posted by rolker View Post
    I'm slow, so I can teach you what not to do on a 125.
    knowing what not to do is a great start!

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    Isaac LRRS/CCS #871 ECK Racing | Spears Enterprises | GMD Computrack Boston | Pine Motorparts/PBE Specialists | Woodcraft | Street & Competition | MTag-Pirelli | OnTrack Media
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  4. #54
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    Re: Teach me about TZ and RS 125s

    It is true, but it will take a lot longer to get fast on a bike that has no torque. You cannot recover from mistakes by just twisting the throttle. If you have fallen off the pipe, nothing happens. LOL

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  5. #55
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by Paul_E_D View Post
    If you have fallen off the pipe, nothing happens.
    You're going to have to explain this one to me as well. Yes, I've so much to learn.

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  6. #56
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by Ductard View Post
    Just curious - why would a 600 be more expensive than a liter bike?
    In LRRS? More race classes you can run on a MW than an Unlimited.

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  7. #57
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by isaac_ View Post
    You're going to have to explain this one to me as well. Yes, I've so much to learn.
    125s have a very narrow, specific range of RPMs within which they make power. If you're outside that range all that happens when you twist the throttle is the engine flips you the bird, says it's "le tired and going to take le nap now..." and does nothing. Literally and figuratively, nothing. If it's feeling generous the exhaust note will change to that of a open mouthed yawn. Meanwhile, you'll be wishing for a set of pedals to try and keep the bike moving.

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  8. #58
    Soul Rider Paul_E_D's Avatar
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    Re: Teach me about TZ and RS 125s

    125 GP motors are highly tuned. They make power between about 10K and 13K revs. If you let it drop below ten and open the throttle, it feels like hitting the brakes. LOL. You will have to downhift once or maybe twice to get back to going forward. Now you have lost 15 mph, and half a second.

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  9. #59
    Lifer isaac_'s Avatar
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    Re: Teach me about TZ and RS 125s

    I liked Kurlon's answer because it made me chuckle, but I liked Paul's answer because it was informative.

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  10. #60
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by Paul_E_D View Post
    You will have to downhift once or maybe twice to get back to going forward. Now you have lost 15 mph, and half a second.
    It gets worse if something happens in T3 that slows me down, where I'm already down to 1st gear. In that case, feathering the clutch is the only way to make it up the hill.

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    Roland Arsenault
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  11. #61
    Soul Rider Paul_E_D's Avatar
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    Re: Teach me about TZ and RS 125s

    Oh yeah! Add to that the fact that 1st gear is as tall as 3rd on a 600. It's actually not easy to take T3 fast enough to stay on the pipe in 1st when you are learning on the 125!

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  12. #62
    Soul Rider Paul_E_D's Avatar
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    Re: Teach me about TZ and RS 125s

    Oh, and when the power does come on, it is ALL on.

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  13. #63
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    Re: Teach me about TZ and RS 125s

    Does anyone race 250s at LRRS? Can't seem to remember any ever being there. Or maybe just a couple?

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  14. #64
    Soul Rider Paul_E_D's Avatar
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    Re: Teach me about TZ and RS 125s

    250s are all but gone at Loudon and nationally for that matter. They really are the ULTIMATE race bike. But they are VERY expensive to run these days.

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  15. #65
    Fast is contagious JettaJayGLS's Avatar
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    Re: Teach me about TZ and RS 125s

    Quote Originally Posted by Paul_E_D View Post
    250s are all but gone at Loudon and nationally for that matter. They really are the ULTIMATE race bike. But they are VERY expensive to run these days.
    How difficult or practical to throw a yz250 motor into a 125gp chasis or something like that? the 250gp's are 2 cylinders though, aren't they?

    Your comment of power on/off just had me think about it. Its what I miss most about my prior yz250. The 125s I have ridden are much much more tame. I crave the 250 powerband.

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  16. #66
    Senior Member jerseygirl's Avatar
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    Re: Teach me about TZ and RS 125s

    I remember coming out of 2 one time on a 125 and twisting the throttle and nothing, so I downshifted and almost launched the bike out from under me! Literally! When they are on, they are ON. The trouble I had was going from my 350 to a 125 and vice versa. My 350 is a great bike, but is SUCH a pig compared to the 125. Oh and the amount of shifting you have to do in one lap is crazy. I guess once you are fast, maybe it isn't as many shifts, but my foot and leg were tired after 2 laps!

    I think I am more of a twin girl, but the 125 was definitely an experience and I would ride one again. Do you still love me Paul

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  17. #67
    Soul Rider Paul_E_D's Avatar
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    Re: Teach me about TZ and RS 125s

    Um, I'll think about it...

    Jay, an MX 250 is not even in the ballpark of a twin cylinder 250GP bike. The 125 roadracers are pretty exciting to ride as Kerry found out. The 250s are just sublime!

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  18. #68
    Fast is contagious JettaJayGLS's Avatar
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    Re: Teach me about TZ and RS 125s

    Do the 125gp's pack a greater punch than the 125mx bikes? I think 125mx bikes are awesome machines and are by no means slow. They're just relatively tame compared to their bigger 250 brothers.

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  19. #69
    Soul Rider Paul_E_D's Avatar
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    Re: Teach me about TZ and RS 125s

    Mine was making about 40HP. The world level ones hit 50hp. It's more that they are tuned so highly compared to an MX bike. The rush of power is waaaay up in the revs, so more of it pours on at once. Of course, the 250s have double.

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  20. #70
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    Re: Teach me about TZ and RS 125s

    There is still one 250GP machine, or at least there was last year. I had a ball racing that lil screamer in GTL.

    250 and 500 MX smokers have been jammed in GP chassis by quite a few people. As Paul noted a 250MX motor doesn't make anywhere NEAR the 70+ a 250GP twin puts down. The 500's don't quite make the same peak either but have a FAR wider torque curve. Both like to vibrate their donor frames to bits, or so I've heard. There is lots of speculation that a Quadzilla motor may be the ideal candidate, 500 two stroke single that's built for quad abuse, lots of build potential, AND has a counter balancer... but I've yet to see a completed one turn laps.

    The middle ground is to just motard a two stroke. You'll be on a chassis you're familiar with, with a maint book that is similar to the GP machines, slotted into multiple classes you'd be competitive in. It's still not a GP bike though, one of these days I'll try one...

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  21. #71
    Fast is contagious JettaJayGLS's Avatar
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    Re: Teach me about TZ and RS 125s

    KX500 has a counterbalance as well I believe.

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    A man of many names...Jay, Gennaro, Gerry, etc.

  22. #72
    Lifer Kurlon's Avatar
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    Re: Teach me about TZ and RS 125s

    I never saw any reference to a counterbalanced KX500, but if there is such a variant, I know the line is highly regarded as an open class motor.

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  23. #73
    Fast is contagious JettaJayGLS's Avatar
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    Re: Teach me about TZ and RS 125s

    I just remember people talking about putting those in quads over a CR500 motor as they were less prone to rattle apart.

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    A man of many names...Jay, Gennaro, Gerry, etc.

  24. #74
    Lifer Kurlon's Avatar
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    Re: Teach me about TZ and RS 125s

    I think you could get away with claiming a paint mixer powered by a cammed and badly carb'd HD Big Twin is a viable swap compared to a CR500 if less vibration is your primary criteria.

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    Last edited by TTD; 03-20-15 at 11:09 AM.
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